华北平原冬小麦春玉米夏玉米复合种植模式生产优势度与稳定性系统分析

Systemical Analysis on Production Dominance and Stability of Comprehensive Planting Pattern of Winter Wheat-Spring Corn-Summer Corn in Huabei Plain

研究结果表明 ,与冬小麦——夏玉米平作相比 ,冬小麦——春玉米——夏玉米复合种植模式的生产优势度两年平均为 :冬小麦 :春玉米 :夏玉米 =0 .36:0 .2 0 :0 .4 4 ,春玉米的生产优势度偏低 ,提高春玉米对总产量的贡献是进一步挖掘复合种植模式增产潜力的可行途径 ;同时 ,复合种植模式的稳定系数两年平均为 0 .4 690 ,提高 56.4 4 % ,对外界环境的适应性明显增强 ,保持高产的稳定性更大。表 2 ,参

Studies on comprehensive planting pattern(CPP)of winter wheat-spring corm-summercorm,Compared to winter wheat-summer corn sequential cropping planting patterm,Revealed its Dominance of Production was 0 36:0 20:0 40 among winter wheat,Spring corn and summer corn That of spring corn was relatively low To achieve a higher yield of CPP,it was practicable approach to increase the yield of spring corn Stability of CPP was 0 4690 on the average in two years increasing by 56 44%,Its adaptability to environment was increased obviously making its stability of high yield more possible