山原红壤是云南省曲靖地区的主要土地资源,红壤旱地占旱地70%以上,产量低而不稳。通过生产实践调查,认识到红壤施用有机肥和磷肥的重要性。1978年,我们选一低产红壤地,进行施用农、磷肥的长期定位试验。以研究低产红壤的基本特性,低产原因,长期施用农、磷肥的效果及持续时间, The red soil in the mountainous area is the main land resource in Qujing area of ​​Yunnan province. The red soil dryland accounts for more than 70% of the dry land, with low and unsteady yield. Through the production practice survey, realize the importance of applying organic fertilizer and phosphate fertilizer in red soil. In 1978, we selected a low-yielding red soil for long-term locating experiments with farmers and phosphate fertilizers. To study the basic characteristics of low-yield red soil, low yield causes, long-term application of agricultural and phosphate fertilizer effect and duration,