Abstract
A split-plot factorial experiment examined effects of tillage and winter cover crops on sweet corn in 1997. Main plots received tillage or no tillage. Cover crops consisted of hairy vetch, winter rye, or a mix, and N treatments consisted of plus or minus N fertilization. Following watermelon not receiving inorganic N, vetch, and mix cover cropsproduced total N yields of ≈90 kg/ha that were more than four times greater than those obtained with rye. However, vetch dry weight yields (2.7 mg/ha) were only about 60% of those obtained in previous years due to winter kill. Following rye winter cover crops, addition of ammonium nitrate to corn greatly increased ( P < 0.05) corn yields and foliar N concentrations compared to treatments not receiving N. Following vetch, corn yields obtained in tilled treatments without N fertilization equaled those obtained with N fertilization. However, yields obtained from unfertilized no-till treatments were significantly ( P < 0.05) lower than yields of N-fertilized treatments. Available soil N was significantly ( P < 0.05) greater following vetch compared to rye after corn planting. No significant effects of tillage on sweet corn plant densities or yields were detected. It was concluded that no-tillage sweet corn was successful, and N fixed by vetch was able to sustain sweet corn production in tilled treatments but not in no-till treatments.In previous years normal, higher-yielding vetch cover crops were able to sustain sweet corn in both tilled and no-till treatments.
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Claims 11
Claim · model-written summary
Vetch and mixed cover crops produced about 90 kg/ha N, over four times rye.
Verbatim
e0“vetch, and mix cover cropsproduced total N yields of ≈90 kg/ha that were more than four times greater than those obtained with rye.”
Claim · model-written summary
Vetch dry weight yield was 2.7 mg/ha, about 60% of prior years because of winter kill.
Verbatim
e0“vetch dry weight yields (2.7 mg/ha) were only about 60% of those obtained in previous years due to winter kill.”
Claim · model-written summary
Ammonium nitrate after rye increased corn yield significantly.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- addition of ammonium nitratee0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Comparator
- treatments not receiving Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following rye winter cover crops, addition of ammonium nitrate to corn greatly increased ( P < 0.05) corn yields and foliar N concentrations compared to treatments not receiving N.”
Claim · model-written summary
Ammonium nitrate after rye increased corn foliar N significantly.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- addition of ammonium nitratee0
- Outcome
- foliar N concentrationse0
- Direction
- increasede0
- Comparator
- treatments not receiving Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following rye winter cover crops, addition of ammonium nitrate to corn greatly increased ( P < 0.05) corn yields and foliar N concentrations compared to treatments not receiving N.”
Claim · model-written summary
After vetch, tilled unfertilized corn yielded as much as fertilized corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- tilled treatments without N fertilizatione0
- Outcome
- corn yieldse0
- Direction
- equalede0
- Comparator
- with N fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following vetch, corn yields obtained in tilled treatments without N fertilization equaled those obtained with N fertilization.”
Claim · model-written summary
In no-till plots, unfertilized corn yield was significantly below fertilized yield.
- Treatment
- unfertilized no-till treatmentse0
- Outcome
- yieldse0
- Direction
- lowere0
- Comparator
- N-fertilized treatmentse0
Not reportedTaxon
Verbatim
e0“yields obtained from unfertilized no-till treatments were significantly ( P < 0.05) lower than yields of N-fertilized treatments.”
Claim · model-written summary
Available soil N was significantly greater after vetch than rye.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- vetche0
- Outcome
- Available soil Ne0
- Direction
- greatere0
- Comparator
- ryee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Available soil N was significantly ( P < 0.05) greater following vetch compared to rye after corn planting.”
Claim · model-written summary
Tillage had no significant effect on sweet corn plant density.
Not reportedComparator
Verbatim
e0“No significant effects of tillage on sweet corn plant densities or yields were detected.”
Claim · model-written summary
Tillage had no significant effect on sweet corn yields.
Not reportedComparator
Verbatim
e0“No significant effects of tillage on sweet corn plant densities or yields were detected.”
Claim · model-written summary
The authors concluded no-tillage sweet corn was successful.
Verbatim
e0“It was concluded that no-tillage sweet corn was successful, and N fixed by vetch was able to sustain sweet corn production in tilled treatments but not in no-till treatments.”
Claim · model-written summary
Vetch fixed N sustained sweet corn production under tillage but not no-till.
Verbatim
e0“N fixed by vetch was able to sustain sweet corn production in tilled treatments but not in no-till treatments.”
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