Abstract
A split-plot factorial experiment examined effects of tillage and winter cover crops on `Merit' sweet corn in 1994, 1995, and 1996. 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 inorganic N fertilization. The shoot N contents of vetch and mix cover crops ranged from 100 to 150 kg/ha, whereas N contents of rye were usually <50 kg/ha. In 1994 and 1995, vetch shoot N contents were 150 kg/ha, and corn yields following vetch were not significantly affected by addition of inorganic N fertilizer. In 1996, vetch N contents only equaled 120 kg/ha, and corn yields were significantly increased by addition of inorganic N. Supplemental N was also required to obtain maximum yields following mix and rye cover crops in all years, even though the N contents of vetch and mix cover crops were normally similar. Measurements of corn foliar N and available soil N were in agreement with the yield results. No-tillage did not significantly affect corn yields following vetch. However, no-till corn yields were reduced with rye (1995) and the mix (1995 and 1996) as a result of reduced corn plant population densities. Reliable tillage results were not obtained for 1994. It was concluded that a vetch cover crop could adequately supply N to sweet corn if vetch N content was at least 150 kg/ha. Sweet corn following rye or vetch/rye mix cover crops required additional N for optimal yields. Significant N in the mix cover crop was probably immobilized as the rye component decomposed. No-till sweet corn was grown successfully following vetch, but yields were often reduced with the mix or rye cover crops.
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Claims 12
Claim · model-written summary
Vetch and mixed cover crops had shoot nitrogen contents of 100 to 150 kg/ha.
Verbatim
e0“The shoot N contents of vetch and mix cover crops ranged from 100 to 150 kg/ha”
Claim · model-written summary
Rye cover crop nitrogen content was usually below 50 kg/ha.
- Taxon
- rye
Secale cerealee0 - Outcome
- N contentse0
- Value
- <50 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N contents of rye were usually <50 kg/ha”
Claim · model-written summary
In 1994 and 1995, inorganic nitrogen did not significantly change corn yield after vetch with 150 kg/ha shoot nitrogen.
Verbatim
e0“In 1994 and 1995, vetch shoot N contents were 150 kg/ha, and corn yields following vetch were not significantly affected by addition of inorganic N fertilizer”
t0“Sweet Corn”
Claim · model-written summary
In 1996, inorganic nitrogen significantly increased corn yield after vetch with 120 kg/ha nitrogen.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- addition of inorganic Ne0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Value
- 120 kg/hae0
- Comparator
- vetche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1996, vetch N contents only equaled 120 kg/ha, and corn yields were significantly increased by addition of inorganic N”
Claim · model-written summary
Supplemental nitrogen was needed for maximum corn yield after mixed and rye cover crops in all years.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Supplemental Ne0
- Outcome
- maximum yieldse0
- Qualifier
- following mix and rye cover crops in all yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplemental N was also required to obtain maximum yields following mix and rye cover crops in all years”
e1“and corn yields following vetch”
Claim · model-written summary
Corn foliar nitrogen and available soil nitrogen agreed with yield results.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn foliar N and available soil Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Measurements of corn foliar N and available soil N were in agreement with the yield results”
Claim · model-written summary
No-tillage did not significantly affect corn yield after vetch.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- No-tillagee0
- Outcome
- corn yieldse0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No-tillage did not significantly affect corn yields following vetch”
Claim · model-written summary
No-till corn yield was reduced after rye in 1995 because of lower plant population density.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- no-tille0
- Outcome
- corn yieldse0
- Direction
- reducede0
- Qualifier
- with rye (1995)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no-till corn yields were reduced with rye (1995) and the mix (1995 and 1996) as a result of reduced corn plant population densities”
Claim · model-written summary
No-till corn yield was reduced after mixed cover crop in 1995 and 1996 because of lower plant population density.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- no-tille0
- Outcome
- corn yieldse0
- Direction
- reducede0
- Qualifier
- the mix (1995 and 1996)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no-till corn yields were reduced with rye (1995) and the mix (1995 and 1996) as a result of reduced corn plant population densities”
Claim · model-written summary
Vetch with at least 150 kg/ha nitrogen can adequately supply nitrogen to sweet corn.
Verbatim
e0“a vetch cover crop could adequately supply N to sweet corn if vetch N content was at least 150 kg/ha”
Claim · model-written summary
Sweet corn after rye or vetch and rye mix should receive additional nitrogen for optimal yields.
Verbatim
e0“Sweet corn following rye or vetch/rye mix cover crops required additional N for optimal yields”
Claim · model-written summary
Nitrogen in the mixed cover crop was probably immobilized during rye decomposition.
Verbatim
e0“Significant N in the mix cover crop was probably immobilized as the rye component decomposed”
t0“Sweet Corn”
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