Abstract
The experiment consisted of two dates of planting [in September (D1) and February (D2)] of maize (Zea mays L.) DKC 67-60, to evaluate the effect of four N fertilization levels (0, 56, 112 and 185 kg/ha) and three ages at harvest [70, 77 and 84 days after planting (DAP)] on dry matter yield (DMY) of the leaves, stem, ear and of the entire plant; and as indicators of nutritive value [crude protein (CP) and neutral detergent fiber (NDF)] of harvested material prior to ensiling. In both plantings, the levels of N affected (P<0.05) DMY of leaves, stems, ears and entire plant, exhibiting both a linear and a quadratic response, and suggesting that the optimum N application rate is between 112 and 185 kg/ha. Age at harvest date affected (P<0.05) DMY of stems, ears and entire plant, but not that of the leaves. Greater DMY was observed at 84 DAP for all components. The CP concentration was greater in the forage of the first planting (D1). Increasing N application rates increased CP, but had no effect on NDF concentration. Age at harvest had no effect on CP, but progressively increased NDF. Both pH and organic acid concentrations in the silages were similar with the four N levels; all of the silages showed good fermentation characteristics.
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Claims 13
Claim · model-written summary
Nitrogen rate significantly affected corn dry matter yield of leaves, stems, ears and the entire plant, with linear and quadratic responses.
- Taxon
- plante0
- Treatment
- levels of Ne0
- Outcome
- DMY of leaves, stems, ears and entire plante0
- Qualifier
- linear and a quadratic responsee0
Not reportedComparatorDirection
Verbatim
e0“In both plantings, the levels of N affected (P<0.05) DMY of leaves, stems, ears and entire plant, exhibiting both a linear and a quadratic response”
Claim · model-written summary
The suggested optimum nitrogen rate was between 112 and 185 kg/ha.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that the optimum N application rate is between 112 and 185 kg/ha”
t0“corn (Zea mays L.)”
Claim · model-written summary
Harvest age significantly affected dry matter yield of stems, ears and the whole plant.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Age at harvest date affected (P<0.05) DMY of stems, ears and entire plant, but not that of the leaves.”
t0“corn (Zea mays L.)”
Claim · model-written summary
Harvest age did not significantly affect leaf dry matter yield.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Age at harvest date affected (P<0.05) DMY of stems, ears and entire plant, but not that of the leaves.”
t0“corn (Zea mays L.)”
Claim · model-written summary
Dry matter yield of all corn components was greatest at 84 days after planting.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater DMY was observed at 84 DAP for all components.”
t0“corn (Zea mays L.)”
Claim · model-written summary
Forage crude protein concentration was greater in the first planting.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CP concentration was greater in the forage of the first planting (D1).”
t0“corn (Zea mays L.)”
Claim · model-written summary
Higher nitrogen rates increased crude protein.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N application rates increased CP”
t0“corn (Zea mays L.)”
Claim · model-written summary
Higher nitrogen rates did not change neutral detergent fiber concentration.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N application rates increased CP, but had no effect on NDF concentration.”
t0“corn (Zea mays L.)”
Claim · model-written summary
Harvest age did not affect crude protein.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Age at harvest had no effect on CP”
t0“corn (Zea mays L.)”
Claim · model-written summary
Increasing harvest age progressively increased neutral detergent fiber.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Age at harvest had no effect on CP, but progressively increased NDF.”
t0“corn (Zea mays L.)”
Claim · model-written summary
Silage pH was similar across four nitrogen rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both pH and organic acid concentrations in the silages were similar with the four N levels”
t0“corn (Zea mays L.)”
Claim · model-written summary
Silage organic acid concentrations were similar across four nitrogen rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both pH and organic acid concentrations in the silages were similar with the four N levels”
t0“corn (Zea mays L.)”
Claim · model-written summary
All silages had good fermentation characteristics.
- Outcome
- good fermentation characteristicse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all of the silages showed good fermentation characteristics.”
t0“corn (Zea mays L.)”
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