Abstract
Nitrogen is required for adequate residue production from cereal cover crops used in no‐till cotton ( Gossypium hirsutum L.) production, but residues can immobilize N needed by cotton. We conducted a 3‐yr field study on a Decatur silt loam (clayey, kaolinitic, thermic Rhodic Paleudult) in northern Alabama to test N fertilizer practices for cotton grown with a rye ( Secale cereale L.) cover crop and conservation tillage. Nitrogen rates applied to the rye cover crop were 0, 34, and 67 kg N ha −1 and cotton N rates were 0, 45, 90, and 135 kg N ha −1 Additionally, 15 N microplots were established in cover crop N treatments of 34 kg N ha −1 and in cotton treatments of 90 kg N ha −1 Data collected included cover crop aerial biomass, cover crop C/N ratios, cotton leaf N at first flower, lint yield, lint quality, and 15 N in plant and soil samples. Cotton grown in unfertilized rye treatments needed 57 to 60% (38–40 kg N ha −1 ) more N to maximize yields above median conventional tillage N recommendations (67 kg N ha −1 ). Cover crop N rates of 67 kg N ha −1 maximized cover crop biomass production for soil protection and soil organic matter aggradation. If the cover crop was fertilized, minimum cotton N applications of 70 and 76 kg N ha −1 were needed for economic optimum and maximum lint yield, respectively. We speculate that cotton N rates may be decreased in the future as new N and C pool equilibria are reached.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Cotton following unfertilized rye required 57 to 60% more nitrogen than the conventional recommendation to maximize yield.
- Taxon
- Cotton
Gossypium hirsutume0 - Treatment
- unfertilized rye treatmentse0
- Outcome
- N to maximize yieldse0
- Direction
- moree0
- Value
- 57 to 60%e0
- Qualifier
- 38–40 kg N ha −1e0
- Comparator
- median conventional tillage N recommendationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton grown in unfertilized rye treatments needed 57 to 60% (38–40 kg N ha −1 ) more N to maximize yields above median conventional tillage N recommendations (67 kg N ha −1 ).”
Claim · model-written summary
Applying 67 kg N ha −1 to the rye cover crop maximized its biomass production.
- Taxon
- rye
Secale cerealee1 - Treatment
- Cover crop N rates of 67 kg N ha −1e0
- Outcome
- cover crop biomass productione0
- Direction
- maximizede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cover crop N rates of 67 kg N ha −1 maximized cover crop biomass production for soil protection and soil organic matter aggradation.”
t0“Cover Crop Fertilization”
e1“rye ( Secale cereale L.) cover crop”
Claim · model-written summary
Fertilized-cover-crop cotton needed at least 70 kg N ha −1 for economic optimum lint yield.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- economic optimume0
- Value
- 70e0
- Qualifier
- kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If the cover crop was fertilized, minimum cotton N applications of 70 and 76 kg N ha −1 were needed for economic optimum and maximum lint yield, respectively.”
Claim · model-written summary
Fertilized-cover-crop cotton needed at least 76 kg N ha −1 for maximum lint yield.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- maximum lint yielde0
- Value
- 76 kg N ha −1e0
- Qualifier
- If the cover crop was fertilizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If the cover crop was fertilized, minimum cotton N applications of 70 and 76 kg N ha −1 were needed for economic optimum and maximum lint yield, respectively.”
The same questions in other papers
cover crop · yield · Secale cereale (rye)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- positive
3 papers more in this group
See all 7 papers →nitrogen · yield · Secale cereale (rye)Positive and negative results
19 papers in the same direction as this paper · 6 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- no effect
- positive
24 papers more in this group
See all 28 papers →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.