Application of different P fertilizers to rice in cold-waterlogged paddy field

Effects of different P fertilizer application on rice growth and soil available P content in cold-waterlogged paddy field were studied. The results showed that the increase of rice yield was 6.0%-13.1% by applying different P fertilizers with very significant difference, which the most obvious efficacy occurred when applying fused calcium-magnesium phosphate; content of available P in paddy soil increased to some degree when fertilizing different kinds of P, but the total P content in the grains decreased. Therefore, fused calcium-magnesium phosphate was the best for increasing rice yield in cold-waterlogged paddy field.