Comparison of Phosphorus Loss Between the Organic Manure Containing High Phosphorus and Potassium and the Calcium Superphosphate in the Runoff of Ground Surface

Key words: 
• surface runoff /
• phosphorus loss /
• organic manure high in P and K /
• calcium superphosphate

Abstract: The field runoff pool for field plot experiment was used to study the loss characteristics of phosphorus of surface runoff in the corn field treated with organic manure containing high phosphorus and potassium,and fertilizer calcium superphosphate. The organic manure and the fertilizer calcium superphosphate treatments had a total surface runoff loss of phosphorus of 0. 77 kg·ha^-1 and 1. 12 kg·ha^-1,respectively under the total rainfall of 415 mm. At low rainfall（ 26- 37 mm）,the total phosphorus concentrations in the runoff liquid were 0. 725-1. 402 mg·L^-1and 0. 677- 1. 903 mg·L^-1,respectively,and the total phosphorus losses were 7. 18-37. 62mg and 7. 89- 61. 49 mg,respectively. There was no significant difference between the two treatments. At higher rainfall（ 76- 87 mm）,the total phosphorus concentration of the runoff liquid in both treatments was 0. 699-1. 238 mg·L^-1and 1. 170- 2. 151 mg·L^-1,respectively,and the total phosphorus loss was 139. 3-332. 3mg and 159. 4- 454. 1 mg,respectively. The changes in total phosphorus concentration and total phosphorus loss were significantly lower in the organic manure treatment than in the calcium superphosphate treatment. However,the active phosphorus concentration of the runoff liquid was higher in the organic manure treatment（ 0. 091-0. 359 mg·L^-1） than in the calcium superphosphate treatment（ 0. 066-0. 327 mg·L^-1）,but there was no significant difference between these two treatments.