【摘要】 本文从不同种植密度和施氮量对玉米籽粒产量的影响,建立了二次多项式回归方程。根据玉米的干物质重量、叶面积指数和光合势与籽粒产量之间存在着二次曲线的关系,将不同处理组合各生育时期的干物质重、叶面积指数和光合势分别与籽粒产量建立二次方程,并对方程求极值,从而求出耔粒产量最高时的各生育指标,以此做为最优发展动态的指标。本文还对叶面积指数随时间变化的方程的建立,进行了探讨。更多还原

【Abstract】 Second-degree polynomials equation of maize(Zea Mays L.)grain yield with both planting density and nitrogen fertilization was es- tablished by means of regression analysis.According to quadratic curve correlation between X and Y,quadratic equation were established between X and Y---X standed for dry matter weight,leaf ere index and leaf area duration;Y Standed for grain yield---anda the X values were evaluated at the Y maximum in different growth stages.These X values were regarded as the optimum growth targ- ets.The equation of leaf area index with growth stage was also established in this paper.更多还原