Abstract
ABSTRACT Despite its relevance, nitrogen is poorly utilized by the plants when improperly applied. Thus, the objective of this study was to evaluate the yield and nitrogen use efficiency (NUE) in corn in response to doses and split application of nitrogen fertilization. The experimental design was a randomized block design, with three replications. Doses of nitrogen of 0, 30, 60 and 180 kg ha-1 were applied at sowing in order to create different nutritional status of corn plants and to obtain different values of Normalized Difference Vegetation Index (NDVI) measured with “Greenseeker®” optical sensor. The subplots with nitrogen doses in topdressing of 0, 30, 60 and 90 kg ha-1 at V8 and a dose of 60 kg ha-1 at V12 were placed in experimental plots with doses of 0, 30, 60 and 180 kg ha-1 of nitrogen at sowing. Moreover, NUE was calculated in the experiment using agronomic indexes determined by applications of nitrogen in late topdressing (V8 and V12) and contrasted to the possible combinations at doses of 60, 90 and 120 kg ha-1 of total N applied. The results showed the occurrence of a linear relationship between nitrogen fertilizer dose and NDVI at V8 as well as at V12 stages. Late topdressing fertilizations (V12) did not cause a decrease in grain yield when combined with nitrogen fertilization at sowing, moreover resulted in higher NUE. Split the nitrogen dose showed better NUE than the combinations where nitrogen was not applied at sowing or in topdressing. The delay of nitrogen topdressing can be an alternative for the planning of the moment of the N fertilization according to the climate forecast in each region.
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Claims 6
Claim · model-written summary
Nitrogen fertilizer dose had a linear relationship with NDVI at V8.
- Taxon
- corn
Zea mays subsp. mayst0 - Organ / stage
- V8e0
- Treatment
- nitrogen fertilizer dosee0
- Outcome
- NDVIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed the occurrence of a linear relationship between nitrogen fertilizer dose and NDVI at V8 as well as at V12 stages.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
Claim · model-written summary
Nitrogen fertilizer dose had a linear relationship with NDVI at V12.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- V12e0
- Treatment
- nitrogen fertilizer dosee0
- Outcome
- NDVIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed the occurrence of a linear relationship between nitrogen fertilizer dose and NDVI at V8 as well as at V12 stages.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
Claim · model-written summary
V12 topdressing combined with sowing nitrogen did not decrease grain yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Late topdressing fertilizations (V12)e0
- Outcome
- grain yielde0
- Direction
- did not cause a decreasee0
- Comparator
- nitrogen fertilization at sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Late topdressing fertilizations (V12) did not cause a decrease in grain yield when combined with nitrogen fertilization at sowing, moreover resulted in higher NUE.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
Claim · model-written summary
V12 topdressing combined with sowing nitrogen yielded higher NUE.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Late topdressing fertilizations (V12)e0
- Outcome
- NUEe0
- Direction
- highere0
- Comparator
- nitrogen fertilization at sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Late topdressing fertilizations (V12) did not cause a decrease in grain yield when combined with nitrogen fertilization at sowing, moreover resulted in higher NUE.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
Claim · model-written summary
Split nitrogen application gave better NUE than schedules omitting sowing or topdressing nitrogen.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Split the nitrogen dosee0
- Outcome
- NUEe0
- Direction
- bettere0
- Comparator
- the combinations where nitrogen was not applied at sowing or in topdressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Split the nitrogen dose showed better NUE than the combinations where nitrogen was not applied at sowing or in topdressing.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
Claim · model-written summary
Delaying nitrogen topdressing was proposed as an option for scheduling fertilization around regional climate forecasts.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- The delay of nitrogen topdressing can be an alternativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The delay of nitrogen topdressing can be an alternative for the planning of the moment of the N fertilization according to the climate forecast in each region.”
t0“Yield and nutritional efficiency of corn in response to rates and splits of nitrogen fertilization”
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