Abstract
A field experiment was carried out to study the uptake,accumulation and translocation of nitrogen of four winter wheat varieties at different N-levels on the dryland.This experiment was designed using a split-plot design.5 levels of nitrogen fertilizers were the main plots and 4 varieties were the subplots.The application rate of nitrogen fertilizer was 0,60,120,180 and 300 kg/ha,respectively;and the varieties was Shaan 253(V1),Shaan 229(V2),Xiaoyan 503(V3) and Xiaoyan 22(V4).The results showed that the highest N uptake in the growth period occurred from reviving stage to anthesis stage.The nitrogen accumulation rate,which had significant differences between different varieties,increased as N rate increased.When the rate of N fertilizer was higher than 180 kg/ha,grain yield was decreased with the increase of N rate,indicating plant receiving the luxury N uptake.The nitrogen accumulation of Xiaoyan 22 variety was the highest,followed with Shaan 253,Xiaoyan 503 and Shaan 229.The proportion of N accumulated in leaf and stem was high before the anthesis stage;and the accumulated N rate in stem reached peak at the anthesis stage.The residual N in leaf and stem at the maturing stage showed an obvious upward trend with the increasing N rate.The highest N accumulation of wheat grain took place at the N rate of 180 kg/ha.The N transportation efficiency of different organs during grain filling stage ranked in the following order,leafspikestem.Different varieties had various N use efficiency.Compared to other varieties,Xiaoyan 22 had higher N recovery,N agronomic efficiency and N physiological efficiency.This showed that Xiaoyan 22 had a high efficiency of N uptake,translocation and utilization.
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Claims 12
Claim · model-written summary
The greatest seasonal nitrogen uptake occurred from reviving to anthesis.
- Taxon
- winter wheat
Triticum aestivumt0 - Organ / stage
- reviving stage to anthesis stagee0
- Outcome
- N uptakee0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest N uptake in the growth period occurred from reviving stage to anthesis stage.”
t0“winter wheat”
Claim · model-written summary
Nitrogen accumulation rate differed significantly among varieties.
- Taxon
- winter wheatTriticum aestivumt0
- Material
- different varietiese0
- Outcome
- nitrogen accumulation ratee0
- Direction
- significant differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen accumulation rate,which had significant differences between different varieties,increased as N rate increased.”
t0“winter wheat”
Claim · model-written summary
Nitrogen accumulation rate increased with nitrogen rate.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- N ratee0
- Outcome
- nitrogen accumulation ratee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen accumulation rate,which had significant differences between different varieties,increased as N rate increased.”
t0“winter wheat”
Claim · model-written summary
Grain yield decreased as nitrogen rate increased above 180 kg/ha.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- N fertilizer was higher than 180 kg/hae0
- Outcome
- grain yielde0
- Direction
- decreasede0
- Comparator
- 180 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the rate of N fertilizer was higher than 180 kg/ha,grain yield was decreased with the increase of N rate”
t0“winter wheat”
Claim · model-written summary
Xiaoyan 22 had the highest nitrogen accumulation, followed by Shaan 253, Xiaoyan 503 and Shaan 229.
- Taxon
- winter wheatTriticum aestivumt0
- Material
- Xiaoyan 22e0
- Outcome
- nitrogen accumulatione0
- Direction
- higheste0
- Comparator
- Shaan 253,Xiaoyan 503 and Shaan 229e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen accumulation of Xiaoyan 22 variety was the highest,followed with Shaan 253,Xiaoyan 503 and Shaan 229.”
t0“winter wheat”
Claim · model-written summary
Leaves and stems held a high share of accumulated nitrogen before anthesis.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- leaf and steme0
- Outcome
- proportion of N accumulatede0
- Direction
- highe0
- Qualifier
- before the anthesis stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of N accumulated in leaf and stem was high before the anthesis stage”
t0“winter wheat”
Claim · model-written summary
Stem nitrogen accumulation reached its peak at anthesis.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- steme0
- Outcome
- accumulated N ratee0
- Direction
- peake0
- Qualifier
- at the anthesis stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulated N rate in stem reached peak at the anthesis stage.”
t0“winter wheat”
Claim · model-written summary
Residual nitrogen in leaves and stems at maturity increased with nitrogen rate.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- leaf and steme0
- Treatment
- increasing N ratee0
- Outcome
- residual Ne0
- Direction
- upward trende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The residual N in leaf and stem at the maturing stage showed an obvious upward trend with the increasing N rate.”
t0“winter wheat”
Claim · model-written summary
Grain nitrogen accumulation was greatest at 180 kg/ha nitrogen.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- graine0
- Treatment
- N rate of 180 kg/hae0
- Outcome
- N accumulatione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest N accumulation of wheat grain took place at the N rate of 180 kg/ha.”
Claim · model-written summary
Leaf nitrogen transport efficiency during grain filling exceeded that of spikes and stems.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- leafspikesteme0
- Outcome
- N transportation efficiencye0
- Qualifier
- during grain filling stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: Ordering punctuation is absent in the source text.
Verbatim
e0“The N transportation efficiency of different organs during grain filling stage ranked in the following order,leafspikestem.”
t0“winter wheat”
Claim · model-written summary
Nitrogen-use efficiency varied among varieties.
- Taxon
- winter wheatTriticum aestivumt0
- Material
- Different varietiese0
- Outcome
- N use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Different varieties had various N use efficiency.”
t0“winter wheat”
Claim · model-written summary
Xiaoyan 22 exceeded other varieties in nitrogen recovery, agronomic efficiency and physiological efficiency.
- Taxon
- winter wheatTriticum aestivumt0
- Material
- Xiaoyan 22e0
- Outcome
- N recovery,N agronomic efficiency and N physiological efficiencye0
- Direction
- highere0
- Comparator
- other varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to other varieties,Xiaoyan 22 had higher N recovery,N agronomic efficiency and N physiological efficiency.”
t0“winter wheat”
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fertilization · yield · Triticum aestivum (wheat)Positive and negative results
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