Abstract
We conducted field experiments in which nitrogen (N) was applied to summer maize at different rates and different basal/topdressing ratios. The experiments were carried out in 2009 in Hengshui and Xinji, Hebei province, China. The results showed that basal application of N was necessary for maize growth in early summer and for high grain yields. For the Hengshui and Xinji sites, 30 and 57 kg N ha −1 , respectively, would meet the N demands of maize before 7-leaf stage. The total rates of 120 and 180 kg N ha −1 , respectively, would maximize grain yields, and in-season N management based on crop N demands and soil N supply could reduce N inputs by more than 50% in Hengshui and 25% in Xinji, respectively, in one maize growth season, compared with farmers' practice, but the sustainability of the optimum N rates for maximum grain yield of next seasons crop needs to be further studied. Optimum N management should take into account the existing nutrient conditions at each site, soil fertility and texture, and crop demands.
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Claims 9
Claim · model-written summary
Basal nitrogen was necessary for early maize growth.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basal application of N was necessary for maize growth in early summer and for high grain yields”
Claim · model-written summary
Basal nitrogen was necessary for high grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“basal application of N was necessary for maize growth in early summer and for high grain yields”
Claim · model-written summary
At Hengshui, 30 kg N ha −1 met maize demand before the 7-leaf stage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the Hengshui and Xinji sites, 30 and 57 kg N ha −1 , respectively, would meet the N demands of maize before 7-leaf stage”
Claim · model-written summary
At Xinji, 57 kg N ha −1 met maize demand before the 7-leaf stage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the Hengshui and Xinji sites, 30 and 57 kg N ha −1 , respectively, would meet the N demands of maize before 7-leaf stage”
Claim · model-written summary
At Hengshui, 120 kg N ha −1 maximized grain yield.
Not reportedTaxonComparatorSetting
Verbatim
e0“The total rates of 120 and 180 kg N ha −1 , respectively, would maximize grain yields”
Claim · model-written summary
At Xinji, 180 kg N ha −1 maximized grain yield.
Not reportedTaxonComparator
Verbatim
e0“The total rates of 120 and 180 kg N ha −1 , respectively, would maximize grain yields”
Claim · model-written summary
In-season management could reduce nitrogen inputs by more than 50% at Hengshui versus farmer practice.
- Treatment
- in-season N managemente0
- Outcome
- N inputse0
- Direction
- reducee0
- Value
- more than 50%e0
- Comparator
- farmers' practicee0
- Setting
- Hengshuie0
Not reportedTaxon
Verbatim
e0“in-season N management based on crop N demands and soil N supply could reduce N inputs by more than 50% in Hengshui and 25% in Xinji, respectively, in one maize growth season, compared with farmers' practice”
Claim · model-written summary
In-season management could reduce nitrogen inputs by 25% at Xinji versus farmer practice.
- Treatment
- in-season N managemente0
- Outcome
- N inputse0
- Direction
- reducee0
- Value
- 25%e0
- Comparator
- farmers' practicee0
- Setting
- Xinjie0
Not reportedTaxon
Verbatim
e0“in-season N management based on crop N demands and soil N supply could reduce N inputs by more than 50% in Hengshui and 25% in Xinji, respectively, in one maize growth season, compared with farmers' practice”
Claim · model-written summary
Optimum nitrogen management should account for site nutrients, soil fertility and texture, and crop demand.
- Outcome
- Optimum N managemente0
Not reportedTaxon
Verbatim
e0“Optimum N management should take into account the existing nutrient conditions at each site, soil fertility and texture, and crop demands”
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