Yield stability and dry matter accumulation and distribution differences of maize cultivars under different water and nitrogen environments
To investigate the effects of water and nitrogen on environmental adaptation and yield formation in different maize cultivars,a field experiment was carried out using eight maize cultivars under six different water and nitrogen treatment combinations.The additive main effects and multiplicative interaction(AMMI)model was used to analyze the yield stability and productivity.The differential responses in dry matter accumulation and allocation a-mong these cultivars under varying water-nitrogen conditions were discussed.The results indicated that,among the tested cultivars,'Junyu 535','Qiangsheng 388','Meiyu 22',and'Shengyu 367'were cultivars with higher yield stability,while'Xiangeng 303','Qinlong 14','Ximeng M1711',and'Jinbei 516'exhibited lower yield stability.Cultivars with higher stability showed significantly higher 100-grain weight,as well as significantly higher dry matter accumulation and allocation coefficients in ears during silking stage and grains during maturity stage.However,compared to cultivars with higher stability,those with lower stability exhibited increases of 21.64％and 49.22％in 100-grain weight under irrigation and nitrogen application,respectively.Under supplemental irrigation,dry matter accumulation in ears during the silking stage and in grains during the maturity stage was 14.92％and 24.79％higher,respectively for cultivars with lower stability.Additionally,the allocation coefficients for these cul-tivars increased by 58.40％and 34.68％,respectively.Similarly,under nitrogen application,the dry matter accu-mulation in ears during silking stage and grains during maturity stage was 46.96％and 27.55％higher for cultivars with lower stability compared to those with higher stability,respectively.The allocation coefficients for cultivars with lower stability rose by 57.93％and 61.19％,respectively.Consequently,the increases in yield were 5.91％and 97.02％higher under supplementary irrigation and nitrogen application,respectively.This resulted in the yield of cultivars with lower stability being 9.60％lower than that of cultivars with higher stability under W0N0 treatment,but 0.50％higher under W1N2 treatment.This suggests that cultivars with lower stability are more sensitive to vari-ations in nitrogen or irrigation levels.
maizecultivarwater and nitrogen regulationAMMI modelyielddry matter accumulation and allocation
万方数据
维普
