Abstract: The yield response of Chinese cabbage and capsicum to phosphorus fertilizer was studied by field location experiment. The status of residual phosphorus and the content of total phosphorus in vegetables were also investigated under different dose of applying of phosphorus fertilizer. The safe and economic dose of P fertilizer were recommended based on the regression equation and the status of residual phosphorus in the soils for two years’ field fertilizer experiment. The results showed that the yield of Chinese cabbage and capsicum was increased significantly by applying phosphorus. The model of Quadratic+ plateau could express the yield response of Chinese cabbage and capsicum to phosphorus fertilizer. The highest yield of Chinese cabbage and capsicum were calculated according to the regression equation were 186.71kg•hm-2, 339.00 kg•hm-2 respectively. The content of total phosphorus of Chinese cabbage and capsicum, total phosphorus and Olsen-P in the profile of 0～20cm soil were increased gradually accompanying with the increase of P fertilizer application. Phosphorus was absorbed luxuriously with applying high level phosphorus fertilizer. The economic and safe phosphorus dose was 112.5 kg•hm-2 in Chinese cabbage and 225.0 kg•hm-2 in capsicum. Applying P 450.00 kg•hm-2, 675.00 kg•hm-2 for 2 times, did not increase the yield of Chinese cabbage.

Key words: P fertilizer, Chinese cabbage, capsicum, the response of yield, residual phosphorus in soil