Abstract
Understanding plant N uptake dynamics is critical for increasing fertilizer N uptake efficiency (FUE) and minimize the risk of N leaching. The objective of this research was to determine the effect of residence time of N fertilizer on N uptake and FUE of sweet corn. Plants were grown in 25 L columns during the fall and spring to mimic short-term N uptake dynamics. Nitrogen was applied either 1, 3, or 7 d before a weekly leaching event, using KNO3 solution (total of 393 kg N ha(-1)). Residence times (tR) were tR-1, tR-3, and tR-7 d before weekly removal of residual soil N. Plant N uptake was calculated by comparing weekly N recovery from planted with non-planted columns. During the fall, N uptake values at 70 d after emergence were 59, 73, and 126 kg N ha(-1). During the spring, corresponding values were 54, 108, and 159 kg N ha(-1). A linear response of plant growth and yield to the tR was observed under cooler conditions, whereas a quadratic response occurred under warmer conditions. There was correlation between root length density and yield. It is concluded that increasing N fertilizer residence time, which is indicative of better irrigation practices, enhanced overall sweet corn growth, yield, N uptake, and FUE, consequently reduced the risk of N being leached below the root zone before complete N uptake.
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Claims 9
Claim · model-written summary
Fall nitrogen uptake after 70 days was 59 kg N ha(-1) for tR-1.
Verbatim
e0“During the fall, N uptake values at 70 d after emergence were 59, 73, and 126 kg N ha(-1).”
t0“Sweet Corn”
Claim · model-written summary
Spring nitrogen uptake after 70 days was 54, 108 and 159 kg N ha(-1) across residence times.
Verbatim
e0“During the spring, corresponding values were 54, 108, and 159 kg N ha(-1).”
t0“Sweet Corn”
Claim · model-written summary
Growth responded linearly to residence time under cooler conditions.
Not reportedDirection
Verbatim
e0“A linear response of plant growth and yield to the tR was observed under cooler conditions”
t0“Sweet Corn”
Claim · model-written summary
Yield responded linearly to residence time under cooler conditions.
Not reportedDirection
Verbatim
e0“A linear response of plant growth and yield to the tR was observed under cooler conditions”
t0“Sweet Corn”
Claim · model-written summary
Growth and yield responded quadratically under warmer conditions.
Not reportedDirection
Verbatim
e0“whereas a quadratic response occurred under warmer conditions.”
t0“Sweet Corn”
Claim · model-written summary
Root length density correlated with yield.
Not reportedDirection
Verbatim
e0“There was correlation between root length density and yield.”
t0“Sweet Corn”
Claim · model-written summary
Longer nitrogen residence enhanced sweet corn growth and yield.
- Taxon
- sweet corne0
- Treatment
- increasing N fertilizer residence timee0
- Outcome
- sweet corn growth, yielde0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“increasing N fertilizer residence time, which is indicative of better irrigation practices, enhanced overall sweet corn growth, yield, N uptake, and FUE”
Claim · model-written summary
Longer nitrogen residence enhanced nitrogen uptake and fertilizer uptake efficiency.
- Taxon
- sweet corne0
- Treatment
- increasing N fertilizer residence timee0
- Outcome
- N uptake, and FUEe0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“increasing N fertilizer residence time, which is indicative of better irrigation practices, enhanced overall sweet corn growth, yield, N uptake, and FUE”
Claim · model-written summary
Longer nitrogen residence reduced risk of leaching below the root zone.
- Taxon
- sweet corne0
- Treatment
- increasing N fertilizer residence timee0
- Outcome
- risk of N being leached below the root zonee0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“increasing N fertilizer residence time, which is indicative of better irrigation practices, enhanced overall sweet corn growth, yield, N uptake, and FUE, consequently reduced the risk of N being leached below the root zone before complete N uptake.”
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