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Abstract:Screening of crop genotypes with strong tolerance to low nitrogen £¨TLN£© and high nitrogen efficiency £¨HNE£© is an effective way to improve nitrogen use efficiency, save mineral resources and reduce environmental pollution. This paper discussed the concepts, screening periods, evaluation indicators of crop tolerance to low nitrogen and nitrogen efficiency, analyzed the similarities and differences between the TLN and HNE. The results showed that the evaluation index and screening period of low nitrogen resistance and nitrogen efficiency was basically similar. Through compared with the different types of nitrogen nutrition division, it was reasonably concluded that different varieties divided into inefficient nonresponder, inefficient responder, efficient nonresponder and efficient responder, which could clearly show the different crop genotypes nitrogen use efficiency situation. Reasonable and comprehensive evaluating the nitrogen utilization in different crop genotypes, strengthen the physiological and molecular biological mechanism of crop low nitrogen tolerance and nitrogen efficiency will make a big impact to crop breeding, cultivation and the development of efficient green agriculture.
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Keyword:crop; resistance to low nitrogen; nitrogen efficiency;
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