Abstract
A 6‐yr field experiment was conducted in central Pennsylvania to determine the fertilizer N equivalent value of three forage legumes managed as hay prior to 3 yr of succeeding corn ( Zea mays L.). The forage component of the rotations were 3 yr of alfalfa ( Medicago sativa L.), 3 yr of birdsfoot trefoil ( Lotus corniculatus L.) (BFT), and 2 yr of red clover ( Trifolium pretense L.). There was no significant grain yield response to N fertilizer for first‐year corn following any of the legumes. The 3‐yr total fertilizer N equivalences of alfalfa, BFT, and red clover were estimated to be 167,151, and 131 lb/acre, respectively. The proportion contributed each year averaged 70% the first, 20% the second, and 10% the third for alfalfa and red clover, and 55%, 30%, and 15% for the three years with BFT. The beneficial effect of legumes on subsequent corn yields appeared to be due primarily to their residual N rather than to a crop sequence or rotation effect.
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Claims 8
Claim · model-written summary
no significant grain yield response to N fertilizer in first-year corn after any of the legumes
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- N fertilizere1
- Outcome
- grain yield responsee1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e1“There was no significant grain yield response to N fertilizer”
Claim · model-written summary
alfalfa gave a 3-year total fertilizer N equivalence of 167 lb/acre for succeeding corn
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- alfalfae2
- Outcome
- fertilizer N equivalencese2
- Value
- 167e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e2“fertilizer N equivalences of alfalfa, BFT, and red clover were estimated to be 167,151, and 131 lb/acre, respectively”
Claim · model-written summary
birdsfoot trefoil gave a 3-year total fertilizer N equivalence of 151 lb/acre for succeeding corn
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- BFTe2
- Outcome
- fertilizer N equivalencese2
- Value
- 151e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e2“fertilizer N equivalences of alfalfa, BFT, and red clover were estimated to be 167,151, and 131 lb/acre, respectively”
Claim · model-written summary
red clover gave a 3-year total fertilizer N equivalence of 131 lb/acre for succeeding corn
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- red clovere2
- Outcome
- fertilizer N equivalencese2
- Value
- 131e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e2“fertilizer N equivalences of alfalfa, BFT, and red clover were estimated to be 167,151, and 131 lb/acre, respectively”
Claim · model-written summary
alfalfa contributed 70% of its N equivalence in the first year, 20% in the second and 10% in the third
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- alfalfae3
- Outcome
- proportion contributed each yeare3
- Value
- 70% the first, 20% the second, and 10% the thirde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e3“The proportion contributed each year averaged 70% the first, 20% the second, and 10% the third for alfalfa and red clover”
Claim · model-written summary
red clover contributed 70% of its N equivalence in the first year, 20% in the second and 10% in the third
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- red clovere3
- Outcome
- proportion contributed each yeare3
- Value
- 70% the first, 20% the second, and 10% the thirde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e3“The proportion contributed each year averaged 70% the first, 20% the second, and 10% the third for alfalfa and red clover”
Claim · model-written summary
birdsfoot trefoil contributed 55%, 30% and 15% of its N equivalence in the three years
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- BFTe4
- Outcome
- proportion contributed each yeare3
- Value
- 55%, 30%, and 15%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e3“The proportion contributed each year averaged 70% the first, 20% the second, and 10% the third for alfalfa and red clover”
e4“and 55%, 30%, and 15% for the three years with BFT”
Claim · model-written summary
the beneficial effect of legumes on succeeding corn yields appears to be due mainly to residual N rather than a rotation effect
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- beneficial effect of legumes on subsequent corn yieldse5
- Qualifier
- residual N rather than to a crop sequence or rotation effecte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prior to 3 yr of succeeding corn ( Zea mays L.)”
e5“The beneficial effect of legumes on subsequent corn yields appeared to be due primarily to their residual N rather than to a crop sequence or rotation effect”
The same questions in other papers
fertilization · yield · Zea mays (maize)Positive and negative results
422 papers in the same direction as this paper · 3,485 in the opposite direction
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