Andrew McGuire Profile Banner
Andrew McGuire Profile
Andrew McGuire

@agronomistag

Followers
10,169
Following
1,213
Media
940
Statuses
10,956

Views of an agronomist on soil, farming, and science. Evidence-based agriculture. Washington State University Extension.

Moses Lake, Washington, USA
Joined April 2017
Don't wanna be here? Send us removal request.
Explore trending content on Musk Viewer
Pinned Tweet
@agronomistag
Andrew McGuire
2 months
Buying a used car? Signing a contract? You take precautions. The same caution is needed when reading published scientific materials, as marketing tactics are increasingly being used in these publications. Reader beware. My latest:
6
13
67
@agronomistag
Andrew McGuire
2 years
The idea that biodiversity drives ecosystem function is deeply engrained in ecology, and has been applied to agriculture. A rigorous analysis of causation vs. correlation challenges this: "there is no causal relationship found between biodiversity and ecosystem functioning."
Tweet media one
36
187
732
@agronomistag
Andrew McGuire
2 months
A picture is worth 1000 small plots?
Tweet media one
16
57
511
@agronomistag
Andrew McGuire
11 months
Increasing soil organic matter is difficult. How difficult? Here are the numbers: To increase SOM 1%➡️1.1% (=11 tons in top 6"), with 1%/yr loss, requires ~6.7 tons/ac biomass = 223 corn or 239 bu/ac wheat crops. See my calculations, do your own...
33
135
499
@agronomistag
Andrew McGuire
3 years
Types of Agronomy Papers.
Tweet media one
12
68
465
@agronomistag
Andrew McGuire
3 years
How NOT to publicize your research. Both the tweet and the paper could have easily stated: "Surfactants, NOT glyphosate, cause high levels of mortality following contact exposure in bumble bees." And highlight this: "This wasn't meant to be 'field realistic' for agriculture"
@EdStrawBio
Ed Straw
3 years
NEW RESEARCH: Roundup, the worlds most used weedkiller, can kill bumble bees! Why this is important and what it means for pesticides, a thread: 1/17
Tweet media one
67
658
1K
20
121
434
@agronomistag
Andrew McGuire
3 years
True story: legumes fix nitrogen Based on a true story: legume crops never need fertilizer Inspired by a true story: we can replace all fertilizers with soil biology
12
61
403
@agronomistag
Andrew McGuire
5 months
Nope. Wheat can feed 3x more people than perennial wheatgrass, which is not a root crop.
34
36
355
@agronomistag
Andrew McGuire
2 years
As seen in the tweet below, many people believe if we just mix crops to the field to get away from monoculture (1 species), yields increase. This is NOT true. A farmer produces more food by growing only wheat without walnuts. Let's add some context and nuance to this.
21
66
354
@agronomistag
Andrew McGuire
10 months
Does synthetic nitrogen fertilizer burn up soil organic matter? Multiple studies say NO. N fertilizer actually slows loss of old soil organic matter and increases microbial biomass and new soil organic matter. New from @jwadeexperience and I:
25
89
329
@agronomistag
Andrew McGuire
1 year
"The truth that agriculture consumes 6% of the world’s fossil fuel energy" should not be something to deplore. It is, rather, quite impressive that we can feed 8.1 billion people on only 6%, and this too will improve. "Awash in fossil fuel" 🙄 = Whining of well-fed activists.
@CivilEats
Civil Eats
1 year
Most American farms consume massive amounts of oil and gas. As the climate crisis intensifies, lawmakers must start regulating the industry and holding it accountable for its impact on the air and water. #oped by @p_lehner
10
2
16
20
96
321
@agronomistag
Andrew McGuire
6 months
So, if N fertilizer increases soil organic matter in the long-term, does it have a similar effect on microbial biomass? This review says YES, N fertilizer application "led to a 15.1% increase in the microbial biomass above unfertilized controls."
Tweet media one
@agronomistag
Andrew McGuire
10 months
Does synthetic nitrogen fertilizer burn up soil organic matter? Multiple studies say NO. N fertilizer actually slows loss of old soil organic matter and increases microbial biomass and new soil organic matter. New from @jwadeexperience and I:
25
89
329
16
83
302
@agronomistag
Andrew McGuire
1 year
How often have you heard, "Farming decreases soil biodiveristy"? Research finds across Europe: "HIGHER diversity of fungi, protists, nematodes, arthropods, and annelids was observed in croplands than in less intensively managed systems"
Tweet media one
11
118
300
@agronomistag
Andrew McGuire
4 years
"Too good to be true" should still be a warning that calls for skepticism.
Tweet media one
19
33
282
@agronomistag
Andrew McGuire
4 years
My youngest daughter is keeping busy at home painting soil microbes.
Tweet media one
10
17
264
@agronomistag
Andrew McGuire
11 months
Nice article on short corn. Benefits: •Better wind resistance •Later season access to field, fertilizer application, etc. •More roots? •Higher yields? More or less crop residue?
Tweet media one
15
65
264
@agronomistag
Andrew McGuire
2 years
Do you think microbes in your manure, compost, or in their extracts, will help your soil? Think again. They often don’t adapt well to the soil’s habitats and don’t compete well with native microbes. My latest...
Tweet media one
30
64
260
@agronomistag
Andrew McGuire
4 months
Surprise of 2023: Cropland soils found to have higher diversity of fungi, protists, nematodes, and arthropods than grasslands and woodlands. And related: soil biodiversity is not tightly linked to plant biodiversity. Open access.
Tweet media one
17
88
245
@agronomistag
Andrew McGuire
5 years
When people invented agriculture, they asked, "What can we change in nature to get more food?" Now in agriculture, farm-like-nature people ask, "What can we change in agriculture to make it more like nature?" The most common result of doing the latter: less food.
28
55
241
@agronomistag
Andrew McGuire
2 years
"We need to build up soil organic matter so we can reduce our reliance on fertilizer" makes little sense. Building organic matter requires nutrients. You can't get nutrients out of the soil that you don't put in unless you want to mine it. Open access.
Tweet media one
21
31
237
@agronomistag
Andrew McGuire
6 months
More research on glyphosate impacts on soil microbiology: neither soil bacteria and fungal diversity (alpha and beta) nor functional potential were impacted by cumulative glyphosate doses.
13
74
231
@agronomistag
Andrew McGuire
3 years
It's scary how many intelligent people believe we rely on N fertilizer because our soils are degraded and not because we need to replace the N that is removed every year to feed people. Yes, we can become better at using N fertilizer, but we are not weaning ourselves from it.
@BenGoldsmith
Ben Goldsmith
3 years
Perhaps a good moment to begin weaning ourselves off the use of vast quantities of chemical fertilisers , start rebuilding our shattered soil and so on?
16
32
163
20
31
235
@agronomistag
Andrew McGuire
4 months
New long-term research: the benefit of no-till practices on water infiltration is large. Unlike tilled soil, where aggregates break down after the first rain or irrigation, no-till methods maintain soil structure and infiltration effectively. Open access
Tweet media one
8
73
234
@agronomistag
Andrew McGuire
2 years
Where do people get this utopian idea that if we just use the right practices we can get away from nutrient inputs? Crop rotation is beneficial but does not return nutrients to the soil. If you are harvesting crops, it's not ♻️, it's ⬆️⬆️⬆️⬆️⬆️⬆️⬆️⬆️ EVEN with legumes.
@wwf_uk
WWF UK
2 years
🌾🔄 - Crops are rotated each year to return nutrients to the soil and reduce disease. #RegenerativeAgriculture @Riverford
Tweet media one
2
0
9
23
36
217
@agronomistag
Andrew McGuire
3 years
The news is distracting.
Tweet media one
6
19
197
@agronomistag
Andrew McGuire
5 years
Crop rotation, even diverse crop rotation, is not an "organic practice," IT IS A FARMING PRACTICE, used by farmers centuries before anyone knew what "organic farming" was. This is just more marketing nonsense.
@agricology
Agricology
5 years
This abstract explores how the organic practice of using diverse rotations to reduce pest and disease and weed levels in following crops can be applied on non-organic farms: @SoilAssociation
Tweet media one
2
13
32
6
36
194
@agronomistag
Andrew McGuire
1 year
Tillage, which destroys soil structure, is considered "ecological weed management" but herbicide use, which maintains soil structure, is not. Why? "Ecological" has come to mean "organic" for many, without consideration of end effects.
Tweet media one
Tweet media two
11
41
195
@agronomistag
Andrew McGuire
10 months
A double inconvenient truth for many: neither nitrogen fertilizer nor glyphosate destroys soil. And, while there are always tradeoffs, these tools can even be beneficial; N fertilizer for building organic matter and glyphosate for helping reduce tillage to reduce erosion.
@agronomistag
Andrew McGuire
10 months
Does synthetic nitrogen fertilizer burn up soil organic matter? Multiple studies say NO. N fertilizer actually slows loss of old soil organic matter and increases microbial biomass and new soil organic matter. New from @jwadeexperience and I:
25
89
329
11
59
189
@agronomistag
Andrew McGuire
4 years
Science is not about what we want, but how things actually are. With cover crop mixtures, the cumulative research results from 27 studies show that, at best, finding a mixture that will beat the best monoculture is quite difficult.
16
49
181
@agronomistag
Andrew McGuire
4 years
Regenerative agriculture would better without the organic-tending stance on synthetic fertilizers and pesticides, without pop-ecology, and without the "save the planet" motive. Just no-till crops and cover crops in a decent rotation with grazed perennials to "stop erosion."
16
25
177
@agronomistag
Andrew McGuire
1 year
The sales pitch: "1 trillion microbes per kg" "works like magic" Do the math: At the recommended application rate, this increases the microbes (bacteria only in calculations) in top 3" of soil by a whopping 0.0003%. Stay skeptical.
Tweet media one
17
24
177
@agronomistag
Andrew McGuire
2 years
About right...same basic practices, different vibe.
Tweet media one
7
26
176
@agronomistag
Andrew McGuire
5 months
Want to improve your soil microbiology? Minimize your tillage. In actual farmed fields, across a region and soil types, reducing tillage had a larger effect than even crop rotation diversity.
Tweet media one
@sssajournal
Soil Science Society of America Journal
5 months
Tillage, texture, or crop diversity – which factor most influences soil microbial abundance and diversity? A recent #SSSAJ on-farm study conducted by Agyei et al. revealed that tillage significantly affects the soil's microbial community
Tweet media one
1
18
60
8
49
177
@agronomistag
Andrew McGuire
3 years
The more you know about soil microbes, without having expertise on the topic, the more likely you are to try to micromanage them with dubious products or practices. Better to improve the soil physical environment, protect your improvements, and let microbes do their thing. ?
16
20
176
@agronomistag
Andrew McGuire
5 years
What is the effect of glyphosate on soils in corn and soybean production? Just published: "No effects of glyphosate were found on soil microbial communities associated with glyphosate-resistant corn and soybean varieties across diverse farming systems."
12
90
172
@agronomistag
Andrew McGuire
1 year
From crop biomass to soil organic matter (SOM), this paper conservatively estimates that ~90% of mass is lost. From other estimates, composting of plant biomass (not manure) has about the same ~90% loss. Building SOM is difficult. Open access.
11
40
171
@agronomistag
Andrew McGuire
2 years
New post: Do soil health indicators indicate soil health? Thanks to @jwadeexperience for first pointing out this problem to me.
Tweet media one
15
28
166
@agronomistag
Andrew McGuire
2 years
Agroecology: Just diversify! Research comparing diversified to simplified cropping systems: 50.9% of trials show reduced yield, 42.8% show reduced biodiveristy. Farmers: monoculture crops in rotation. 👍
Tweet media one
10
36
163
@agronomistag
Andrew McGuire
3 years
If you want to sequester carbon, put it deep in the soil, but if you want to improve your soil's function, concentrate soil organic matter near the surface. This concentration of SOM at the surface can be used as a simple soil health measurement.
Tweet media one
6
28
162
@agronomistag
Andrew McGuire
6 months
Regarding glyphosate effects on the soil, it is important to note that there are always effects when we do or add something to the soil. What the evidence shows is that glyphosate does not drastically disrupt the soil ecosystem. Any minor changes should be evaluated in comparison
@agronomistag
Andrew McGuire
6 months
More research on glyphosate impacts on soil microbiology: neither soil bacteria and fungal diversity (alpha and beta) nor functional potential were impacted by cumulative glyphosate doses.
13
74
231
15
50
162
@agronomistag
Andrew McGuire
2 years
Crop yield was not affected by soil Ca:Mg ratio for any crop in any year...over the 6 years of the study, corn yields were positively related to increases in soil pH ... managing soil acidity remains a fundamental tool to improve crop yields." Open access
7
29
163
@agronomistag
Andrew McGuire
2 years
Some call this "nature-friendly farming" but it was NOT the farming practices that boosted birds and butterflies - they remained the same - it was land taken out of production to create habitat. Habitat made the difference, not farming practices. (land sparing/restoration)
@UK_CEH
UK Centre for Ecology & Hydrology
2 years
NEWS: Agri-environment measures boosted local bird and butterfly populations on a large-scale commercial farm, a decade-long study led by @UK_CEH has found
Tweet media one
4
64
190
7
36
158
@agronomistag
Andrew McGuire
11 months
Extraordinary claim explained by ordinary practice? Gabe Brown claimed to have increased soil organic matter from 6.1% to 11.1% in just 3 years. I challenged that, based on his listed practices. We may now have an explanation: bale grazing.
Tweet media one
@agronomistag
Andrew McGuire
6 years
@KoenvanSeijen @TEDxGrandForks Regenerative Agriculture: Solid Principles, Extraordinary Claims
2
2
18
29
21
157
@agronomistag
Andrew McGuire
4 years
Ha! "replenishing the soil with nutrients" The things people say, and probably believe, to support organic farming. I have never seen that said of using herbicides to do the exact same thing.
23
30
155
@agronomistag
Andrew McGuire
2 years
"With widespread nitrogen limitation, organisms that can fix N would seem to have an advantage. Why don’t they proliferate & eliminate the N deficit? Why can’t we let biological N fixation fix our N fertilizer problem?" My latest...
Tweet media one
14
39
154
@agronomistag
Andrew McGuire
3 months
Biological seed treatments for soybeans, 50 locations over 2 years: Nothing worked everywhere in every year. When they did work, yield increases were small. More details to come.
Tweet media one
@SoyResearchInfo
SoybeanResearchInfoNetwork
3 months
Do biological seed treatments work? Collaborative @SoybeanScience1 #SoyResearch compared common options, with state soy checkoffs and @UnitedSoy support. Initial results show any benefits are local and conditional, with in-depth analysis coming.
Tweet media one
0
16
35
7
45
152
@agronomistag
Andrew McGuire
6 months
Public Service Announcement: Biofertilizers ARE NOT fertilizers. They are inoculants that might fix nitrogen or help make other nutrients more available. Unlike real fertilizers, in themselves they do not add nutrients to your soil. It is unfortunate that science uses this
13
28
151
@agronomistag
Andrew McGuire
9 months
The 4 pillars of modern civilization: 1. Ammonia (nitrogen fertilizer) 2. Plastics 3. Steel 4. Cement Why? Indispensable for function, Needed in large quantities, Not readily replaceable with other materials.
Tweet media one
19
34
145
@agronomistag
Andrew McGuire
10 months
The quote below shows a basic misunderstanding of agriculture. If nature's "highly effective system" were up to feeding us all, we wouldn't need agriculture. The fact is, we do agriculture precisely because nature CANNOT feed us.
Tweet media one
@nongmoreport
Non-GMO Report
11 months
From GMOs to regenerative agriculture: a scientist’s journey | Dr. Laura Kavanaugh went from developing GM crops at Syngenta to advancing regenerative agriculture @AdvancingEcoAg
2
11
25
9
23
148
@agronomistag
Andrew McGuire
7 months
Effective Microorganisms® (EM) found ineffective: "EM did not produce a discernible effect on soil biological or chemical properties, nor did it influence the decomposition process of the cover crop." Not a field study, open access.
10
53
143
@agronomistag
Andrew McGuire
11 months
This is what you get when you send a meteorologist to cover agriculture. Organic marketing slogans. Simplistic explanations, Misinformation. Unfortunately, it's also what you get when you send most journalists to cover agriculture.
@cnni
CNN International
11 months
CNN meteorologist Derek Van Dam flies to Southern California to learn more about regenerative agriculture and why the future of farming might come from the past.
49
52
81
14
32
138
@agronomistag
Andrew McGuire
2 years
2/6 Rather, the observed links are correlations; biodiversity is not the cause. Instead, the analysis suggests that species COMPOSITION drives ecosystem functioning. YES. ! As in legume+non-legume cover crops. Here is the paper, not open access.
6
9
139
@agronomistag
Andrew McGuire
4 months
Compost can provide remarkable soil health benefits, but when the soil that generated the biomass for the compost is considered, many rates of compost application are neither sustainable nor scalable; they resemble a pyramid scheme. My newest...
11
27
130
@agronomistag
Andrew McGuire
4 months
@JMBecologist This is modeled risk and not actual pollution. The map is mislabeled and misleading.
16
3
133
@agronomistag
Andrew McGuire
10 days
Agronomist problems.
Tweet media one
2
16
138
@agronomistag
Andrew McGuire
5 years
A good summary by a cancer epidemiologist. "Glyphosate is a boon to agriculture and humanity. Let’s refocus the energy and resources spent on trying to demonize this useful and valuable chemical on problems that really matter."
4
59
126
@agronomistag
Andrew McGuire
3 years
Even a dead cover crop can prevent serious erosion.
Tweet media one
@CoverCropsMCCC
Midwest Cover Crops Council
3 years
Cover crops help reduce soil erosion, no question there! Ever wondered why #CoverCropsWork ? Check out this article: OR check out our website! We can tell you why they work and what species to use for your soil health goals!
Tweet media one
1
26
80
4
22
130
@agronomistag
Andrew McGuire
2 years
Think you have a soil biology problem? Think again...it's more likely you have a soil habitat problem. And don't fall for alternative methods...a few proven practices will often do. Don't overthink your soil biology. My latest...
Tweet media one
8
22
130
@agronomistag
Andrew McGuire
5 months
Can ag stop focusing on yield? Not yet, concludes this WRI report. Even with reduced food waste, diet changes, and less biofuel production, we still need productivity increases to avoid cropland expansion. We definitely can't allow yields to decrease.
Tweet media one
Tweet media two
Tweet media three
Tweet media four
6
38
130
@agronomistag
Andrew McGuire
2 years
This is worthy of repeating: "There is no ‘ideal’ soil microbial community." "We should not expect healthy soils to have a single ‘optimal’ community type - or that more microbial diversity is always better."
2
24
127
@agronomistag
Andrew McGuire
1 year
Needed repost: What are the effects of glyphosate on soils in corn and soybean production? "No effects of glyphosate were found on soil microbial communities associated with glyphosate-resistant corn and soybean varieties across diverse farming systems."
4
52
124
@agronomistag
Andrew McGuire
2 years
Does ChatGPT know agriculture? I asked it "what are the pros and cons of using cover crops?" Answer below. The machine has learned well.
Tweet media one
11
18
124
@agronomistag
Andrew McGuire
3 years
True story: managed grazing can provide benefits Based on true story: cattle are needed in all ag operations Inspired by true story: grazing cattle can save us from climate change and there's no such thing as eating too much meat
4
16
122
@agronomistag
Andrew McGuire
1 year
Research finds water use by cover crops in dryland cropping often reduces yield of the following crop. Details of the climate matter here, but these are not solutions: ❌higher infiltration rates ❌cover crop mixtures ❌plants increasing rain My latest .
17
31
118
@agronomistag
Andrew McGuire
6 months
Science: an attempt at neutral disinterest in the results with the goal of finding the truth. Activist science: a motivated effort to prove something is so. Nitpicking? Not really. It's a problem with any issue that people are passionate about: soil health, biodiversity...
Tweet media one
16
24
119
@agronomistag
Andrew McGuire
3 years
Here are my essentials of sustaining agricultural production: 1. Protect the soil 2. Maintain soil fertility 3. Use water efficiently 4. Protect the crop In order of importance and therefore, attention.
Tweet media one
8
18
119
@agronomistag
Andrew McGuire
1 month
Nice story showing soil health does not have to be complicated: no-till + cereal rye cover crops = high water infiltration rates and reduced erosion.
3
18
115
@agronomistag
Andrew McGuire
7 months
Why do so many people think we must learn from nature, mimic nature, or use nature as a standard for agriculture, when there is little evidence of any mechanism that would optimize natural ecosystems for producing food?
Tweet media one
25
22
115
@agronomistag
Andrew McGuire
7 months
Six species cover crop no better than monocultures for various soil microbial measurements. Open access.
Tweet media one
@AgricEnvLetters
Agricultural & Environmental Letters
7 months
NMSU researchers assessed microbial community responses after cover crop termination. Responses varied w/ cover crops at & after 36 d post-termination, while effects did not persist for a year, highlighting the value of continuous living roots @nmsu_aces
1
3
14
9
33
113
@agronomistag
Andrew McGuire
5 years
At local industrial hemp meeting, a speaker estimated that CBD demand could be met with just 20,000 acres in the US and that 500,000 were grown last season.
13
28
114
@agronomistag
Andrew McGuire
4 years
Show me a cropped field and I'll show you a native ecosystem that has been destroyed. It's how food is produced. To best protect nature: 1. Intensively produce crops on existing farmland, 2. Minimize off-farm effects, and 3. Rewild marginal farmland.
@agronomistag
Andrew McGuire
4 years
How to greenwash a crop: "in its cultivation and production the crop has a little to no impact on water, land, forest, air or soil." It's the pet rock of crops. Unless it is being foraged in a forest, this cannot be true. Journalists, do better.
1
2
24
9
25
114
@agronomistag
Andrew McGuire
5 years
Why farmers would rather listen to regenerative ag speakers (1) than those from Extension/University (2): 1 Fertilizer suppresses mycorrhizal fungi 2 It depends 1 Mycorrhizal fungi are key to soil health 2 In some systems 1 Fert. suppresses root exudates 2 More research needed
11
23
112
@agronomistag
Andrew McGuire
2 years
The reality of farming is not as simple as often portrayed in social media. While the general public can be enticed to believe simplistic versions of agriculture, or pop-ecology, the truth is more complex, nearly always involving difficult tradeoffs.
3
13
113
@agronomistag
Andrew McGuire
2 years
An interesting discussion of the various theories of why organic matter persists in soils. Open access. This figure does not show any of the theories fading away; they are all persistent. Are they all true in some sense or context?
Tweet media one
4
33
111
@agronomistag
Andrew McGuire
5 years
No difference in soil bacterial diversity between 4-yr organic and no-till with herbicides. Also, I oppose the use of "chemical no-till" and "chemically- managed" as shorthand for use of pesticides and fertilizers. It is misleading and academic journals should aim higher.
@Geoderma_Jrnl
Geoderma - the global #OA journal of soil science
5 years
New in Geoderma, #openaccess : "Soil bacterial communities of wheat vary across the growing season and among dryland farming systems" by Suzanne Ishaq, Tim Seipel, Carl Yeoman, and Fabian Menalled. @montanastate
Tweet media one
1
7
11
7
50
112
@agronomistag
Andrew McGuire
1 year
Despite this being repeated over and over until most people probably believe it, there is little evidence that soil health (apart from its nutrient status) results in healthier or more nutritious food.
@FAO
Food and Agriculture Organization
1 year
Healthy soils mean healthy, safe & nutritious food. In fact, soil health & fertility have a direct influence on the nutrient content of food crops 🌱 Let's take #SoilAction !
169
1K
2K
12
23
113
@agronomistag
Andrew McGuire
3 years
Meta-analysis of hundreds of studies: "All soil organic carbon fractions increase under nitrogen fertilization." Not open access. From @ecology_katie
Tweet media one
3
21
110
@agronomistag
Andrew McGuire
10 months
At first glance, this seems promising, but I always ask, what is cost @ effective rate? Inoculant applied at ~6691 lb/ac. Bulk commercial mycorrhizal inoculant for $15/lb. So this would cost a farmer $100,000/acre. Successful microbiome engineering is very expensive.
@vandeHeijdenLab
van der Heijden Lab
10 months
Successful microbiome engineering in agricultural fields. Our new paper in @NatureMicrobiol demonstrates that large-scale inoculation with arbuscular mycorrhizal fungi works and can promote crop yield up to 40%. @SteffiLutz ; @NBodenhausen ; @KSchlaeppi
Tweet media one
3
40
159
9
16
112
@agronomistag
Andrew McGuire
3 years
This headline is a blatant lie. The paper being reported is a hazard analysis, not a risk analysis: >60% of total results were from labs, NOT the field and there was NO evaluation of actual secondary effects soil health.
7
24
109
@agronomistag
Andrew McGuire
2 months
With regenerative agriculture, it's important to distinguish the results of livestock-only systems from those of annual cropping systems. What is possible with grazing is not possible with annual crops. They function differently.
Tweet media one
8
18
108
@agronomistag
Andrew McGuire
3 years
The demand for soil health information far surpasses the supply of high quality content.
9
12
108
@agronomistag
Andrew McGuire
5 years
No, compost is not the secret. Compost is just importing biomass from a large area and applying it to a smaller area. Of course it works, but it does not scale and ignores the effects on the land that originally produced it.
@agleader
Cannon Michael
5 years
Is #Compost the Secret to Making #Ag #Climate Friendly? | Civil Eats
2
2
7
11
34
107
@agronomistag
Andrew McGuire
5 years
A new contender for MOST EXAGGERATED CLAIM of regenerative agriculture. Also up for MOST IRRESPONSIBLE STATEMENT from a doctor.
@DrZachBush
Zach Bush MD
5 years
If everything grew regeneratively, we wouldn't have disease on this planet.
17
14
67
13
20
107
@agronomistag
Andrew McGuire
3 months
Long term no-till with cover crops: "The combination of CC with NT practices enhanced soil oxygen availability and resilience to extreme precipitation events." Water drains better. Open access.
@AgricEnvLetters
Agricultural & Environmental Letters
3 months
Article alert!📢 Forty-two years of no-tillage and cover cropping improved soil oxygen availability and resilience Research letter by Lussich & colleagues #OpenAccess @UT_Herbert @UTAgResearch @UTIAg
Tweet media one
2
12
28
4
24
108
@agronomistag
Andrew McGuire
2 years
The number of people who have romantic ideals of how agriculture should look and work AND who also get most of their food from farms that look and work like they envision, is tiny.
Tweet media one
11
11
104
@agronomistag
Andrew McGuire
9 months
The risk of inviting highly knowledgeable experts to speak at an Extension event.
Tweet media one
7
5
107
@agronomistag
Andrew McGuire
9 months
The dark side of lighting: a critical analysis of vertical farms' environmental impact.
Tweet media one
5
16
107
@agronomistag
Andrew McGuire
3 years
There is no reason to think that judicious use of synthetic fertilizers and pesticides cannot be a part of any regenerative agriculture. Chemophobia is not a requirement.
10
15
102
@agronomistag
Andrew McGuire
2 years
Perhaps we should evaluate cover crops by looking at the loss of soil by erosion with and without, rather than changes in soil C or crop yields?
Tweet media one
Tweet media two
6
12
102
@agronomistag
Andrew McGuire
10 months
Although many believe it, the statement below is NOT what the research indicates. More on this coming next week.
Tweet media one
5
13
104
@agronomistag
Andrew McGuire
2 years
Healthy soils produce healthy crops, right? Nope. Although it would seem the very definition of soil health, this popular thinking is off. Soil health can help with soilborne diseases, but it is not disease suppression. My latest here...
Tweet media one
12
20
103
@agronomistag
Andrew McGuire
4 months
New biochar study: High-value crop and high application rates (2 tons/ac concentrated below crop row, effective rate=20 tons/ac), 3 types of biochar over 3 years... No effect on yields, minimal effects on soil health. Biochar; the most researched, least used soil amendment.
@sssajournal
Soil Science Society of America Journal
4 months
Article alert!📢 #Biochar influences soil health but not yield in 3-year processing tomato field trials #OpenAccess study by Gelardi & colleagues @ucdavisCAES #SoilHealth
Tweet media one
0
13
58
15
31
103
@agronomistag
Andrew McGuire
2 years
"A meta-analysis of 1,521 field observations of advanced nitrogen-management practices published during the past two decades...finds 11 key practices that enhance crop yield and fertilizer NUE while decreasing nitrogen losses to the environment."
Tweet media one
6
28
102
@agronomistag
Andrew McGuire
1 year
Turns out it isn't the "factory" part of "factory farming" that environmentalists oppose, at least for plants; pvc piping, artificial lighting, heating, cooling, water pumps and ventilation, and lots of stainless steel. Maybe they just don't like farms?
Tweet media one
@World_Wildlife
World Wildlife Fund
1 year
Did you know farmers can grow plants indoors without soil? Soilless farming aims to reduce many of the more harmful effects of conventional field farming, including decreasing pressures on land, biodiversity, natural habitat, and climate:
6
7
48
11
21
99
@agronomistag
Andrew McGuire
9 months
Another study on soil microbial diversity. Fungal and bacterial diversity linked to 3 factors: climate, pH and land cover. pH is the only one you can manage. So, 1. Don't worry about your soil's microbial diversity. 2. If you want to manage it, don't let your pH get too low.
Tweet media one
@lultimoalbero
alberto_orgiazzi
9 months
New study from @EU_ScienceHub soil team & @vandeHeijdenLab based on LUCAS, the largest 🇪🇺 soil bio survey🦠🍄🤎 "Interaction effects of pH and land cover on soil microbial diversity are climate-dependent" Full story on @Environmicrobi @AMIposts ➡️
Tweet media one
0
21
45
12
30
102
@agronomistag
Andrew McGuire
2 years
Cautionary tale of believing regenerative agriculture's hype about soil biology providing nutrients. “In time, though, those farms are going to mine those soils. It just might take a little bit longer than it did for us.” HT @ursellberger
8
25
100
@agronomistag
Andrew McGuire
4 years
Every time I check out the source of a popular but misleading tweet about soil/crops/agriculture (you can filter searches by # of retweets in tweetdeck), the sender almost always has 10K followers, sometimes many more. Enticing but untrue stories are more popular than reality.
12
7
98
@agronomistag
Andrew McGuire
1 year
Confirmed: 1. Crop rotation is still beneficial. 2. Legumes still beneficial in low fertility systems. 3. Benefits increase over time (probably because of a buildup of soilborne pathogens in monocropping) Open access.
4
26
94
@agronomistag
Andrew McGuire
6 years
"research found that within one month of tillage events, in the surface 10 cm of the soil there were losses of 52% of microbial biomass and 33% of organic carbon." Most people in ag would have guessed this result, but it's good to have actual evidence.
3
61
96
@agronomistag
Andrew McGuire
1 year
10% "We estimate that nitrogen fixation in aerial-root mucilage could replace up to 10% of the fertilizer nitrogen applied to U.S. maize, that 2% of plant carbon income used for growth would suffice to fuel the fixation, and that this would reduce grain yield only slightly."
Tweet media one
@ADHansonLab
Andrew D Hanson Lab
1 year
Knowledge is power. 'Fermi calculations' (aka back-of-envelope calcs) = time-tested way to rough but reliable knowledge of what's feasible or not. Vital in #SynBio . W/ @JeanMichelAne team, Jeff Amthor, Carlos Messina we ran demo Fermi calcs on 2 concepts⬇️
Tweet media one
1
25
78
5
27
95
@agronomistag
Andrew McGuire
6 years
What is the effect of glyphosate (Roundup) on soil bacteria and fungi? Older studies were hampered by their inability to grow most soil microbes in the lab. What do the newer genetic tools tell us? It does not have much effect, especially compared to other factors...
10
61
93