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在吉林省西部白城地区天然、人工草场设置氮磷锌三因素五水平最优回归设计的田间试验.结果表明,该区草场需要营养元素的次序是氮和磷,其次是锌,可暂不施钾肥.对7个肥料效应回归方程按频率分析法算出亩施肥N6.0kg、P_2O_5 6.0kg和ZnSO_4 2kg,每公斤肥料可增产干草13kg.本文还分析了各处理羊草的养分含量,施肥后干草中磷和磷/钙比值略低于国际标准外,其它养分元素均属正常含量.
In the natural and artificial grassland of Baicheng in the western part of Jilin Province, field experiments were conducted to design the optimal regression design of three factors and five levels of nitrogen, phosphorus and zinc. The results showed that the order of nutrient elements in the grassland was nitrogen and phosphorus, followed by zinc, Potassium fertilizer.The regression equation of seven fertilizer effects was calculated according to the frequency analysis method of fertilizer N6.0kg, P205 6.0kg and ZnSO42 2kg, yield of hay per kilogram of fertilizer can increase 13kg.This paper also analyzed the nutrient content of Leymus chinensis, Phosphorus and phosphorus / calcium ratio slightly lower than the international standards, other nutrients are normal content.