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一、间种增产原因的分析 (一)改善与充分利用群体环境 (二)间种作物的选择与种间关系二、玉米的产量变化规律 (一)玉米的边行优势 1.玉米行数的影响 2.土壤肥力的影响 3.矮秆作物行数的影响 (二)保持玉米的合理密度 1.调整玉米行数比例
First, the analysis of the reasons for the increase between species (A) to improve and make full use of group environment (B) the choice of crops and the relationship between species Second, the variation of corn yield (A) Impact 2. Soil Fertility 3. Dwarf crop line number (b) to maintain a reasonable density of corn 1. To adjust the corn line number ratio