【摘要】 通过 1997、1998两年对全市各县 2 5 3块玉米田的施肥量调查 ,建立了低、中、高三类土壤基础肥力产量目标函数的氮、磷效应模型 ^Y =b。 +b1N +b2 P +b11N2 +b2 2 P2 +b12 NP ,据此求出最大产量的最大施肥量及经济最佳施肥量。根据经济最佳氮、磷配比 ,将两因素肥效模型简化为单因素经济最佳养分组合模型 ^Y =AZ2 +BZ +C ,从而得出不同目标产量的经济最佳养分合成及氮、磷最佳施用量 ,便于用计算机指导玉米配方施肥。更多还原

【Abstract】 By investigation for fertilizer application rate in 253 field of maize in 1997&1998,N&P action equation for high,medium and low soil fertilizer are established as =b 0+b 1N+b 2P+b 11 N 2+b 22 P 2+b 12 NP. Maximum and optimal N&P fertilizer opplication rates can be calculated by these equations . According to the optimal ration of NP,the equation can be simplified as =AZ 2+BZ+C,The N&P optimal ration and application rates caculated by the equation can help fertilizing decision-making.更多还原