Welcome to Chinese Agricultural Science Bulletin,
CASB

Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (10): 221-225.doi: 10.11924/j.issn.1000-6850.2014-2382

Previous Articles     Next Articles

Release Kinetics of Nonexchangeable Potassium in an Orchard Soil of Winter Jujube

Wang Qinghua1, Du Zhenyu1,2, Ma Bingyao1, Liu Fangchun1, Ma Hailin1   

  1. (1Shandong Academy of Forestry Science, Jinan 250014;2State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008)
  • Received:2014-08-31 Revised:2015-03-06 Accepted:2014-12-03 Online:2015-05-05 Published:2015-05-05

Abstract: In order to explore release characteristics of nonexchangeable potassium (K) in winter jujube orchard (WJO) soil, the release kinetics of nonexchangeable potassium by CaCl2 and citric solution were studied by using a successive extraction method. The results showed that the soil nonexchangeable K release was comprised of two processes: rapid and slow ones. In the rapid release process (<188 h), accumulative K release amount occupied 53.6%-59.2% of the total amount, but only less than 50% in slow release process (188-1244 h). The K release amount in citric solution was higher than that in CaCl2 solution at the same time. By comparison, the K release amount of WJO was higher compared with the control. The power function equation was the best model for describing nonexchangeable K release in WJO soil.