Journal of Food, Agriculture and Environment

Nitrogen absorption and utilization characteristics in different wheat cultivars and its regulation effect by nitrogen fertilizer under irrigated and dryland conditions 

Author(s):

Min Sun, Zhi-Qiang Gao*, Zhen-Ping Yang, Li-Heng He, Ai-xia Ren, Xiaomin Ge, Feifei Wen, Weifeng  Zhao

Recieved Date: 2012-09-05, Accepted Date: 2013-01-09

Abstract:

To understand the nitrogen (N) absorption and utilization characteristics of different wheat cultivars and the regulation effects of water and N fertilizer, a drought-resistant cultivar, JM47, and a drought-sensitive cultivar, ND189, were planted under both irrigated and dryland conditions with three N concentration. The results indicated that the N accumulation in plant at different growth stages, N absorption and its corresponding ratio from anthesis to maturity in dryland were lower than those in irrigated land, but the ratio of N absorption amount from elongation stage to anthesis was higher than that in irrigated land. The pre-anthesis N translocation to grain was affected differently by drought stress in these two cultivars. As for JM47, the significant effect was observed under the N application of 140 and 280 kg hm^-2, while slight effect was for ND189. The contribution of post-anthesis N accumulation to N in grains was higher in dryland, and greater regulated by N fertilizer, especially for JM47 than ND189. N application promoted the N accumulation in plant from booting to maturity, and higher rate of N application resulted in greater positive effect. The effects of N application on N absorption and its ratio at different stages, N harvest index, and N absorption of 100 kg grains all suggested that N application could attenuate drought stress, and the regulation effect was greater for drought-tolerant  than drought-sensitive cultivars. Therefore, highly drought-resistant cultivar and N application should be considered for rainfed wheat to improve the yield. 

Keywords:

Wheat, irrigated land, dryland, N application

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 1
Category: Agriculture
Pages: 598-603

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