Abstract: In order to explore whether topdressing phosphorus fertilizer was needed in greenhouse vegetable fields in Beijing, the effect of different phosphorus fertilizer application methods on yield, economic benefit and soil phosphorus content of sweet pepper were studied. The results showed that under the condition of soil available phosphorus content 238.32 mg/kg, the yield of sweet pepper treated with no organic fertilizer + topdressing phosphate, organic fertilizer + no topdressing phosphate and organic fertilizer + topdressing phosphate increased by 2.0%, 4.0% and 28.7% compared with control, respectively. And the net income of no organic fertilizer + topdressing phosphate was the highest, which increased by 1.8% than CK. The average value of available phosphorus content in 0-20 cm and 20-40 cm soil was the lowest under the treatment of organic fertilizer + topdressing phosphorus fertilizer, while the risk of phosphorus enrichment existed in the treatment of no organic fertilizer + topdressing phosphorus fertilizer. Therefore, no organic fertilizer + topdressing phosphorus fertilizer was recommended to cultivate sweet pepper in protected field. The recommended amount of topdressing per 667 m2 was 23 kg of pure N, 5 kg of P2O5 and 15 kg of K2O. |