Abstract
Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield. The purpose of this work was to evaluate the yield components of maize, grain yield and agronomic efficiency, regarding topdress nitrogen doses, cultivated under conventional soil tillage and no-tillage system at Universidade Estadual Paulista (UNESP), campus of Botucatu, SP, using the black oat/corn succession. The experimental design was a randomized complete blocks in split plot arrangement, with four replications. The plots were represented by the different soil tillage systems (conventional and no-tillage), and the subplots by nitrogen doses applied as topdressing (0, 40, 80, 120 and 160 kg N ha-1). Urea was used as N source. The doses of N promoted increases in leaf N content and grain nitrogen content. Maximum grain yield was obtained with the estimative of 92 kg N ha-1 as topdressing. The agronomic efficiency (kg grain per kg N applied) was reduced by increasing N dose, with the greatest gains in grain production per kg of N applied in the no-tillage system.
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Claims 4
Claim · model-written summary
Topdressed N doses increased leaf N content and grain nitrogen content in maize.
- Treatment
- nitrogen doses applied as topdressinge2
- Outcome
- leaf N content and grain nitrogen contente3
- Direction
- increasese3
- Setting
- Botucatu, SPe4
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield”
e2“The plots were represented by the different soil tillage systems (conventional and no-tillage), and the subplots by nitrogen doses applied as topdressing (0, 40, 80, 120 and 160 kg N ha-1)”
e3“The doses of N promoted increases in leaf N content and grain nitrogen content”
e4“Universidade Estadual Paulista (UNESP), campus of Botucatu, SP”
Claim · model-written summary
Maximum maize grain yield was obtained with about 92 kg N ha-1 as topdressing.
- Treatment
- estimative of 92 kg N ha-1 as topdressinge5
- Outcome
- grain yielde5
- Direction
- Maximume5
- Setting
- Botucatu, SPe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield”
e4“Universidade Estadual Paulista (UNESP), campus of Botucatu, SP”
e5“Maximum grain yield was obtained with the estimative of 92 kg N ha-1 as topdressing”
Claim · model-written summary
Agronomic efficiency of maize was reduced by increasing N dose.
- Treatment
- increasing N dosee6
- Outcome
- agronomic efficiency (kg grain per kg N applied)e6
- Direction
- reducede6
- Setting
- Botucatu, SPe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield”
e4“Universidade Estadual Paulista (UNESP), campus of Botucatu, SP”
e6“The agronomic efficiency (kg grain per kg N applied) was reduced by increasing N dose”
Claim · model-written summary
The greatest gains in maize grain production per kg of N applied occurred in the no-tillage system compared with conventional tillage.
- Treatment
- no-tillage systeme7
- Outcome
- grain production per kg of N appliede7
- Direction
- greatest gainse7
- Comparator
- conventionale2
- Setting
- Botucatu, SPe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen is the nutrient required in largest amount, presents the highest cost, and also is the one that most affects maize grain yield”
e2“The plots were represented by the different soil tillage systems (conventional and no-tillage), and the subplots by nitrogen doses applied as topdressing (0, 40, 80, 120 and 160 kg N ha-1)”
e4“Universidade Estadual Paulista (UNESP), campus of Botucatu, SP”
e7“with the greatest gains in grain production per kg of N applied in the no-tillage system”
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