Effects of Long-term Fertilization on Phosphorus Adsorption and Desorption in Purple Soil
Characteristic of phosphorus sorption and desorption in purple soil about long-term different fertilization and rotations was studied. The results showed that the curve of P adsorption raised precipitously in the low P concentration, the curve became slack and soil adsorption capacity weakened gradually as phosphorus concentration rising. Soil adsorption slowed down as P concentration in the solution was 20mg/L and 60mg/L in the way of rice- rape rotation. P concentration 60mg/L of the solution was the change-point of soil adsorption in rice-wheat rotation. It was easier to cause P loss in using cow manure than other fertilizers and cow manure increased risk of P loss. The ratio of desorbed P was lower l0.3％-68.9％ in rice-wheat rotation than in rice-rape rotation according to the ways of cultivation.
long-term fertilization purple soil phosphorus adsorption and desorption
LI Xueping SHI Xiaojun
College of Resources and Environment, Southwest University, Chongqing 400716, China
国际会议
第五届科协博士年度科技会议(The 5th Annual Science Conference for Ph.D)
长春
英文
55-58
2007-08-29（万方平台首次上网日期，不代表论文的发表时间）