有机无机肥配施对红壤磷库重建质量的长期效应

Long-Term Effects of Combined Application of Organic/Chemical Fertilizer on Quality of Phosphorus Pool Rebuilding in Red Soil

以长期施肥的旱地红壤为材料,研究了有机肥与化肥配施对红壤P库重建质量的影响。结果表明,有机无机肥配施能在不同程度上增加红壤全P和速效P的量,但增加速度因有机肥的种类不同而有较大差别。在施用化肥的基础上,配施猪厩肥可以在短期内重建土壤P库,但必须及时调节配比,防止其对环境安全构成威胁:而配施花生秸秆重建土壤P库的速度较为缓慢,且有减少土壤P库储量的趋势,因此必须注意由于秸秆的C/N和C/P过大所带来的不利影响。

An experiment was carried out with upland red soil under long-term fertilization, to study effects of combined application of organic/chemical fertilizer on quality of phosphorus （P） pool rebuilding in soil. Results showed that the contents of total-P and Olsen-P, major components of phosphorus pool, in red soils were increased, but the increase rate varied sharply with the kind of organic manure. In addition to chemical fertilization, application of pig manure could rebuild soil P pool in a short time, but the proportion of chemical fertilizer and pig manure must be adjusted time and again to avoid the potential environmental risk of P in red soil. When peanut stems took the place of pig manure, the rebuilding rate of the soil P pool was slowed down, and even to the extent that the soil P pool tended to be smaller. So it is essential to notice the adverse effect of the C/N and C/P ratios of peanut stems being too high.