河南省不同小麦品种氮效率的差异研究

Differences of Nitrogen Efficiency in Henan Wheat Varieties

选择近年来在河南推广的8个小麦品种,在低氮和高氮2个水平下研究了不同小麦品种氮效率的差异。结果表明:随着施氮量的增加各品种的产量都有所提高,提高的幅度与品种对氮的敏感性有关。在2个氮水平下,8个小麦品种氮效率存在着很大的差异,其中,郑麦004号、太空6号、郑麦9023、周麦16号和豫麦50号在2个氮水平下的氮效率都较高。通径分析结果表明,在低氮水平下,氮效率主要由氮吸收效率决定,在高氮水平下则由氮吸收效率和氮利用效率共同决定。

A pot experiment with eight wheat varieties from Henan province was conducted to investigate the genotype differences in N efficiency at two rates of N supply. The results showed that the grain yields of all varieties increased significantly with the increase of nitrogen application. The increasing rates were related to the variety sensitivity to N. The difference of N efficiency was obvious among the 8 wheat varieties. The N efficienee of Zhengmai 004, Taikong 6, Zhengmai 9023, Zhoumai 16 and Yumai 50 were very high at low N and high N. Path analysis indicated that N efficiency was determined mainly by N uptake efficiency at low N condition, but by both N uptake efficiency and N utilization efficiency at high N condition.