于1983年在独山、贵定、罗甸、长顺等4个地方的中低产土进行了玉米施用氮磷钾三种化肥的肥料试验,探讨了在本地区自然条件下的施用量与产量,利润及环境等之间的各种数量关系。 材料和方法 以历年粮食产量低的土种、肥力、质地、土体厚度、坡度、水热条件不同的4个地方的(共)4种土壤(表1)各3.5亩为试点;供试肥料:基肥用厩肥、大粪,追肥用 In 1983, Dushan, Guiding, Luodian, Changshun and other four places of low-yielding soil fertilizers of maize NPK fertilizers were tested in the region to explore the natural conditions of application and yield , Profits and the environment between the various quantities. Materials and Methods Three 3.5 mu (Table 1) plots of four types of soil (Table 1) were used as pilot projects in four types of soil with low grain yield, fertility, texture, soil thickness, slope, hydrothermal conditions, : Base fertilizer with manure, manure, fertilizer use