Abstract
A field experiment was conducted to study the genotypic variation in nitrogen use efficiency in summer maize by quantify analyzing grain yield and biological yield,harvest index,nitrogen efficiency and responsiveness to nitrogen fertilizer.The results showed that there are significant genotypic variation in grain yield and biological yield among different summer maize varieties whatever nitrogen application rate.So did the harvest index,nitrogen efficiency and nitrogen responsiveness.The tested maize varieties could be classified into four different types based on their nitrogen efficiency and nitrogen responsiveness.Hudan 4,Shanzi 1 and Yedan 19 belonged to H-H type(high N use efficiency with high N responsiveness);Zhongdan 2,Yuyu 22 belonged to L-L type(low N use efficiency with low N responsiveness);Shandan16,Shandan 902 and Hudan 2000 belonged to H-L type(high N use efficiency with low N responsiveness),and Shandan 9 and Nongda108 belonged to L-H type(low N use efficiency and high N responsiveness).Comprehensive considering nitrogen efficiency and responsiveness,three representative genotypes(Hudan4,Yuyu 22 and Hudan 2000) were selected to determine their nitrogen accumulation,and compute their nitrogen utilization efficiency and nitrogen index.The results showed that the nitrogen accumulation couldn't reflect the nitrogen use efficiency in summer maize accurately.The contribution to nitrogen use efficiency was given by nitrogen utilization efficiency rely on nitrogen rate,and the nitrogen index can well reflected the nitrogen use efficiency whatever nitrogen application rate.
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Claims 11
Claim · model-written summary
Grain yield varied significantly among maize varieties at all nitrogen rates.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant genotypic variation in grain yield and biological yield among different summer maize varieties whatever nitrogen application rate”
Claim · model-written summary
Biological yield varied significantly among varieties at all nitrogen rates.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant genotypic variation in grain yield and biological yield among different summer maize varieties whatever nitrogen application rate”
Claim · model-written summary
Harvest index, nitrogen efficiency and responsiveness also varied among genotypes.
- Outcome
- harvest index,nitrogen efficiency and nitrogen responsivenesse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“So did the harvest index,nitrogen efficiency and nitrogen responsiveness.”
e1“summer maize varieties”
Claim · model-written summary
Tested varieties were classified into four nitrogen efficiency and responsiveness types.
- Outcome
- four different typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tested maize varieties could be classified into four different types based on their nitrogen efficiency and nitrogen responsiveness.”
Claim · model-written summary
Hudan 4, Shanzi 1 and Yedan 19 were high-efficiency, high-response types.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hudan 4,Shanzi 1 and Yedan 19 belonged to H-H type(high N use efficiency with high N responsiveness)”
e1“Hudan 4,Shanzi 1 and Yedan 19 belonged to H-H type(high N use efficiency with high N responsiveness)”
e2“summer maize varieties”
Claim · model-written summary
Zhongdan 2 and Yuyu 22 were low-efficiency, low-response types.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zhongdan 2,Yuyu 22 belonged to L-L type(low N use efficiency with low N responsiveness)”
e1“summer maize varieties”
Claim · model-written summary
Shandan16, Shandan 902 and Hudan 2000 were high-efficiency, low-response types.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shandan16,Shandan 902 and Hudan 2000 belonged to H-L type(high N use efficiency with low N responsiveness)”
e1“summer maize varieties”
Claim · model-written summary
Shandan 9 and Nongda108 were low-efficiency, high-response types.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shandan 9 and Nongda108 belonged to L-H type(low N use efficiency and high N responsiveness)”
e1“summer maize varieties”
Claim · model-written summary
Nitrogen accumulation did not accurately reflect nitrogen use efficiency.
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrogen accumulation couldn't reflect the nitrogen use efficiency in summer maize accurately”
Claim · model-written summary
The contribution of nitrogen utilization efficiency to nitrogen use efficiency depended on nitrogen rate.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contribution to nitrogen use efficiency was given by nitrogen utilization efficiency rely on nitrogen rate”
e1“summer maize accurately”
Claim · model-written summary
Nitrogen index reflected nitrogen use efficiency at all nitrogen rates.
- Outcome
- nitrogen use efficiencye0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrogen index can well reflected the nitrogen use efficiency whatever nitrogen application rate”
e1“summer maize accurately”