Abstract
Abstract Because tillage affects root growth and activity, it affects the ability of plants to utilize soil and fertilizer nutrients. It has not been determined if K fertility recommendations developed for clean tillage systems are appropriate for reduced tillage systems. Therefore, an experiment was conducted on a Muscatine silt loam (fine‐silty, mixed, mesic Typic Haplaquoll) and a Sable silty clay loam (fine‐silty, mixed mesic Aquic Argiudoll) to determine the response of soybean [ Glycine max (L.) Merr.] cultivars Williams 82 and Century to three levels of soil K fertility under four tillage systems over 2 yr. The tillage systems were moldboard plow (fall plowed plus spring disk), chisel plow (fall chisel plowed plus spring disk), spring disk, and no‐till. Soil K treatments were 336 kg exchangeable K ha −1 , 336 kg exchangeable K ha −1 plus 73 kg banded K ha −1 , and 560 kg exchangeable K ha− 1 . A corn ( Zea mays )‐soybean rotation was used. Grain yields were similar for the moldboard plow, chisel plow, and disk systems. Grain yields were consistently lower for the no‐till system. This response was greatest for the cultivar Century in a year when herbicide carryover and Phytophthora ( Phytophthora megasperma ) damage under no‐till reduced final plant populations by 44% compared to that with the moldboard plow system. Increasing the exchangeable soil K level from 336 to 560 kg ha −1 increased grain yields of Century during a dry growing season. Tillage did not affect the magnitude of response, and banded K had no effect on grain yield. We concluded that the tillage system should not influence K fertility recommendations for soils such as these.
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Claims 8
Claim · model-written summary
Soybean grain yields were similar under the moldboard plow, chisel plow and disk tillage systems.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- moldboard plow, chisel plow, and disk systemse0
- Outcome
- Grain yieldse0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Grain yields were similar for the moldboard plow, chisel plow, and disk systems”
Claim · model-written summary
Soybean grain yields were consistently lower under the no-till system than under the other tillage systems.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- no‐till systeme0
- Outcome
- Grain yieldse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Grain yields were consistently lower for the no‐till system”
Claim · model-written summary
Under no-till, herbicide carryover and Phytophthora megasperma damage in one year reduced final soybean plant populations by 44% compared with the moldboard plow system.
- Taxon
- SoybeanGlycine maxt0
- Material
- Centurye1
- Treatment
- no‐tille0
- Interactor
- Phytophthora megasperma
Phytophthora megaspermae0pathogen - Outcome
- final plant populationse0
- Direction
- reducede0
- Value
- 44%e0
- Qualifier
- herbicide carryovere0
- Comparator
- moldboard plow systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“herbicide carryover and Phytophthora ( Phytophthora megasperma ) damage under no‐till reduced final plant populations by 44% compared to that with the moldboard plow system”
e1“This response was greatest for the cultivar Century”
Claim · model-written summary
The reduction in grain yield under no-till was greatest for soybean cultivar Century.
- Taxon
- SoybeanGlycine maxt0
- Material
- Centurye0
- Treatment
- no‐tille1
- Outcome
- Grain yieldse1
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“This response was greatest for the cultivar Century”
e1“Grain yields were consistently lower for the no‐till system”
Claim · model-written summary
Raising exchangeable soil K from 336 to 560 kg ha-1 increased grain yield of soybean cultivar Century during a dry growing season.
- Taxon
- SoybeanGlycine maxt0
- Material
- Centurye0
- Treatment
- exchangeable soil K level from 336 to 560 kg ha −1e0
- Outcome
- grain yieldse0
- Direction
- increasede0
- Qualifier
- during a dry growing seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Increasing the exchangeable soil K level from 336 to 560 kg ha −1 increased grain yields of Century during a dry growing season”
Claim · model-written summary
Tillage system did not affect the magnitude of the soybean response to K fertility.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Tillagee0
- Outcome
- magnitude of responsee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Tillage did not affect the magnitude of response”
Claim · model-written summary
Banded K had no effect on soybean grain yield.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- banded Ke0
- Outcome
- grain yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“banded K had no effect on grain yield”
Claim · model-written summary
The authors conclude that tillage system should not influence K fertility recommendations for soils like those studied.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- K fertility recommendationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“the tillage system should not influence K fertility recommendations for soils such as these”
The same questions in other papers
potassium · yield · Glycine max (soybean)Results differ
122 papers in the same direction as this paper · 25 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- negative
145 papers more in this group
See all 149 papers →tillage · yield · Glycine max (soybean)Positive and negative results
125 papers in the same direction as this paper · 264 in the opposite direction
- positive
- no effect
- no effect
386 papers more in this group
See all 390 papers →tillage · Phytophthora megasperma · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.