有机肥与化肥配施对紫色水稻土磷素转化与供应的影响

THE INFLUENCE OF ORGANIC MANURE COMBINED WITH CHEMICAL FERTILIZER ON TRANSFORMATION AND SUPPLY OF PHOSPHORUS IN PURPLE PADDY SOIL

Located and pot experiments were carried out to study the changes of different phosphorus forms and their effect on rice yield, in purple paddy soils under the conditions of combined application of organic manure and chemical fertilizers. The results showed that the properties of phosphorus supply in the soil had beed improved, the content of total and available P had markedly increased in comparision with those with application of chemical fertilizers alone. In recent years, the average yield of rice has been at about the same level or as exceeded that with fertilizer application although no addtional phosphatic fertilizer was applied. The patterns of the changes in the components of inorganic P in purple paddy soils, the causes for the increase in available P and the four components of organic P with different activity are also discussed.