Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (1): 113-122.DOI: 10.11686/cyxb20140114

• Orignal Article • Previous Articles     Next Articles

A study on the dynamics of phosphorus adsorption and desorption characteristics of paddy soil with long-term fertilization

ZHAO Qing-lei1,WU Xiu1,YUAN Shou-jiang1,WANG Kai-rong2,GAO Jie1,CHEN Feng1,ZHANG Shi-yong1,SUN Gong-chen1,XIE Xiao-li3,MA Jia-qing1   

  1. 1.Shandong Rice Research Institute/Shandong Rice Engineering Technology Research Center,Jinan 250100,China;
    2.Institute of Agriculture Ecological and Environmental Health,Qingdao Agricultural University,Qingdao 266109,China;
    3.Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
  • Received:2013-03-29 Online:2014-02-20 Published:2014-02-20

Abstract: The dynamics of phosphorus adsorption and desorption with different patterns of long-term fertilizer application were studied in the 0-20 cm and 20-40 cm soil layers of a reddish paddy rice field using field sampling combined with indoor cultivation. Soil phosphorus in the 0-20 cm and 20-40 cm soil layers showed different adsorption and desorption dynamics with incubation time under the conditions of different patterns of long-term application. Soil phosphorus adsorption capacity at 0-20 cm increased rapidly in the initial stage and then tended towards stability with incubation time,while soil phosphorus adsorption capacity at the 20-40 cm depth increased rapidly in the initial stage and then increased more slowly with incubation time. Organic nutrient recycling combined with fertilizer application at the 0-20 cm layer notably reduced soil phosphorus adsorption capacity,and reduced soil phosphorus adsorption capacity by 20.1% more than NPK fertilizer application at the 0-20 cm layer followed by organic nutrient recycling alone,and by the NPK fertilizer application alone which had no obvious effect. The influences of different fertilizer application patterns on soil phosphorus adsorption capacity at the 20-40 cm depth were not obvious. The soil phosphorus desorption capacity was mainly concentrated in the first few times of digestion,and decreased with an increase of digestion times. Long-term organic nutrient cyclic utilization promoted phosphorus desorption in the 0-20 cm soil layer,and the effects of organic nutrient recycling combined with fertilizer application were better since they enhanced soil phosphorus cumulative desorption rates by 72.2% compared with NPK fertilizer application. NPK fertilizer application inhibited soil phosphorus desorption to a certain extent. Long-term organic nutrient cyclic utilization had no obvious effect on soil phosphorus desorption characteristics at the 20-40 cm depth. Soil phosphorus desorption capacity and cumulative desorption rates were all lower at 0-20 cm than at 20-40 cm depth. Organic nutrient recycling combined with fertilizer application promoted soil phosphorus activation and improved the phosphorus fertility levels.

CLC Number: