Abstract
Abstract The objective of this experiment was to evaluate the effects of irrigation sequence and of time and rate of nitrogen application on the dry matter production and fertilizer use efficiency of irrigated corn ( Zea mays L.), grown on a representative fine‐textured soil of eastern Nebraska, and to monitor the movement of fertilizer N in this soil. During 1974–1976, 15 N‐depleted ammonium sulfate was banded at rates of 112, 168, or 224 kg N/ha at planting or sidedressed at the eight‐leaf growth stage. No N was applied in 1977–1979. In 1974–1977, irrigation applications of 5, 7.5, or 10 cm of water were made at 2‐, 3‐, or 4‐week intervals, respectively, until a total of 30 cm had been applied. The plots were uniformly irrigated in 1978–1979. Grain yield and N uptake in 1974–1976 were not influenced by time of N application, and were highest with light, frequent irrigation. From 1977–1978, yield increased with previous N rate in response to residual mineral N in the soil. During both treatment and residual years, fertilizer N recovery in the grain was greater with sidedressing and increased with N rate. Heavier, infrequent irrigation decreased tracer N recovery in 1974–1976. Maximum fertilizer use efficiency was obtained with the low N rate, applied as a sidedressing, and with light, frequent irrigation.
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Claims 7
Claim · model-written summary
Grain yield and N uptake were not influenced by the time of N application.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- time of N applicatione1
- Outcome
- Grain yield and N uptakee1
- Direction
- not influencede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e1“Grain yield and N uptake in 1974–1976 were not influenced by time of N application”
Claim · model-written summary
Grain yield and N uptake were highest with light, frequent irrigation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- light, frequent irrigatione2
- Outcome
- Grain yield and N uptakee1
- Direction
- higheste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e1“Grain yield and N uptake in 1974–1976 were not influenced by time of N application”
e2“were highest with light, frequent irrigation”
Claim · model-written summary
From 1977 to 1978 yield increased with previous N rate, through residual mineral N in the soil.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- previous N ratee3
- Outcome
- yielde3
- Direction
- increasede3
- Qualifier
- residual mineral N in the soile3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e3“From 1977–1978, yield increased with previous N rate in response to residual mineral N in the soil”
Claim · model-written summary
Fertilizer N recovery in the grain was greater with sidedressing.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- sidedressinge4
- Outcome
- fertilizer N recovery in the graine4
- Direction
- greatere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e4“fertilizer N recovery in the grain was greater with sidedressing and increased with N rate”
Claim · model-written summary
Fertilizer N recovery in the grain increased with N rate.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- N ratee4
- Outcome
- fertilizer N recovery in the graine4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e4“fertilizer N recovery in the grain was greater with sidedressing and increased with N rate”
Claim · model-written summary
Heavier, infrequent irrigation decreased tracer N recovery in 1974–1976.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Heavier, infrequent irrigatione5
- Outcome
- tracer N recoverye5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e5“Heavier, infrequent irrigation decreased tracer N recovery in 1974–1976”
Claim · model-written summary
Maximum fertilizer use efficiency was obtained with a low N rate applied as sidedressing under light, frequent irrigation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- low N rate, applied as a sidedressinge6
- Outcome
- fertilizer use efficiencye6
- Direction
- Maximume6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Irrigated Corn”
e6“Maximum fertilizer use efficiency was obtained with the low N rate, applied as a sidedressing, and with light, frequent irrigation”
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