Effects of Nitrogen Application on Yield Components, Nitrogen Utilization and Potential of Saving Nitrogen of Different Maize Varieties in Lime Concretion Black Soil Region
A field experiment was conducted to study the effects of three nitrogen level on yield, yield compo?nents, nitrogen utilization and the potential of saving nitrogen and increasing yield of six maize varieties in present production in lime concretion black soil region. The results showed that the grain yields of different maize varieties were significantly increased by nitrogen application, but N-fertilizer had comparatively less effect on harvest index. Row grains, ear length and ear diameter were significantly enhanced by N fertilization. Compared with treatment N 0, they improved by 22.5%-66.9%, 16.8%-50.5%and 9.4%-29.7%, respectively, and there were no significant differ?ences between treatment N120 and treatment N240. Both nitrogen agronomic efficiency and nitrogen partial factor pro?ductivity of all varieties were behaved as that treatment N120 were significantly higher than treatment N240, and the av?erage value of six varieties under N120 level were 1.89 and 1.96 times of that of treatment N240, respectively. The po?tential of saving nitrogen and increasing yield of Liyu13 and Zhengdan958 was better than other varieties. It is pro?posed that maize varieties which popularized in large area in lime concretion black soil region of Jiaodong peninsula arranged as Liyu13, Zhengdan958, Xundan20, Xianyu335, Lainong14, Xianfeng32D22.
MaizeLime concretion black soilYield componentNitrogen utilizationPotential of saving nitro?gen
NETL
NSTL
万方数据
维普
