Abstract
Nitrogen (N) is an essential macronutrient for crop growth; therefore, N deficit can greatly limit crop growth and production. In the North China Plain (NCP), winter wheat (Triticum aestivum L.) is one of the main food crops, and its yield has increased from approximately 4000 kg ha−1 to 6000 kg ha−1 in the last two decades. Determining the proper N application rates at different growth stages and in all seasons is very important for the sustainable and high production of wheat in the NCP. A field experiment with five N application rates (250, 200, 150, 100, and 40 kgN·ha−1, designated as N250, N200, N150, N100, and N40, respectively) was conducted during the 2017–2018 and 2018–2019 winter wheat seasons to investigate the effects of the N application rate on water- and fertilizer-utilization efficiency and on the crop growth and yield of winter wheat under sprinkler fertigation conditions. The results showed that in the N application range of 40–200 kg ha−1, crop yield and water- and fertilizer-use efficiencies increased as the N application rate increased; however, further increases in the N application rate (from N200 to N250) did not have additional benefits. The N uptake after regreening of winter wheat linearly increased with crop growth. Considering the wheat yield and N-use efficiency, the recommended optimal N application rate was 200 kg ha−1, and the best topdressing strategy was equal amounts of N applied at the regreening, jointing, and grain-filling stages. The results of this study will be useful for optimizing field N management to achieve high wheat yield production in the NCP and in regions with similar climatic and soil environment conditions.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Yield and water and fertilizer use efficiencies increased with N rate from 40 to 200 kg ha−1.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Treatment
- N application ratee0
- Outcome
- crop yield and water- and fertilizer-use efficienciese0
- Direction
- increasede0
- Comparator
- 40–200 kg ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the N application range of 40–200 kg ha−1, crop yield and water- and fertilizer-use efficiencies increased as the N application rate increased”
t0“Winter Wheat”
Claim · model-written summary
Increasing N from N200 to N250 gave no additional benefit.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- N250e0
- Outcome
- additional benefitse0
- Direction
- did not havee0
- Comparator
- N200e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“further increases in the N application rate (from N200 to N250) did not have additional benefits”
t0“Winter Wheat”
Claim · model-written summary
N uptake after regreening rose linearly with crop growth.
- Taxon
- winter wheatTriticum aestivume0
- Organ / stage
- after regreeninge0
- Outcome
- N uptakee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N uptake after regreening of winter wheat linearly increased with crop growth.”
Claim · model-written summary
Authors recommend 200 kg ha−1 N and equal topdressings at regreening, jointing, and grain filling.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- optimal N application ratee0
- Value
- 200 kg ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the recommended optimal N application rate was 200 kg ha−1, and the best topdressing strategy was equal amounts of N applied at the regreening, jointing, and grain-filling stages.”
t0“Winter Wheat”
The same questions in other papers
nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
1,736 papers in the same direction as this paper · 285 in the opposite direction · 39 reporting no difference from an alternative
- positive
- negative
- negative
2,057 papers more in this group
See all 2,061 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.