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1998～ 1999年度选择基本苗、氮肥用量和稻麦共生期 3个对套播小麦生长发育影响较大的因素 ,采用二次回归近似最优设计进行了田间试验。结果表明 :对套播小麦籽粒产量的重要性程度依次为氮肥用量 >基本苗 >共生期 ;运用计算机模拟、寻优和频数分析法 ,建立了套播小麦籽粒产量 52 97kg/ hm2 的优化农艺方案 ,即基本苗 2 10～ 2 2 3株 / m2 、化学纯氮用量 173.2 5～186 .75kg/ hm2 和共生期 3～ 4 d。
Three factors influencing the growth and development of cover wheat were selected as basic seedlings, nitrogen fertilizer and rice-wheat symbiosis from 1998 to 1999, and field experiments were conducted by using the quadratic regression approximate optimal design. The results showed that the order of importance to the grain yield of intercropped wheat was nitrogen fertilizer> basic seed> symbiotic period. Using computer simulation, search optimization and frequency analysis, the optimal agronomic plan of intercropping wheat grain yield 5297kg / hm2 , That is, the basic seedlings 2 10 ~ 2 2 3 plants / m2, chemical nitrogen consumption of 173.2 5 ~ 186 .75 kg / hm2 and symbiotic period of 3 ~ 4 d.