Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (19): 246-250.doi: 10.11924/j.issn.1000-6850.2013-2410

Special Issue: 园艺

• 23 • Previous Articles     Next Articles

Phosphorus Leaching Critical Values of Soil from Different Parent Materials in South China

  

  • Received:2013-09-10 Revised:2013-10-16 Online:2014-07-05 Published:2014-07-05

Abstract: The lost P from the soils would pose a risk to water quality. In this study, 101 soils were collected from the vegetable soils in the Guangdong. The contents of Olsen-P, Bray-P and CaCl2-P were respectively determined so that phosphorus leaching critical values was determined in different texture soils. The results showed that: there was a significant linear relationship between Olsen- P and CaCl2- P. CaCl2- P increased sharply with the increase of Olsen-P, which was called phosphorus leaching criterion. The criterion values of loamy clay was 79.74 mg/kg, the values of clay loam was 51.08 mg/kg,the values of sandy clay loam was 43.99 mg/kg, the values of sandy loam was 8.63 mg/kg. The order of criterion values was loamy clay>clay loam>sandy clay loam>sandy loam, which was in agreement with the order of clay content. There was a significant linear relationship between Bray-P and CaCl2-P in the sandy clay loam soils while there was not in the rest three texture soils, but there was not change point in the sandy clay loam. The Olsen-P was as the criterion value of phosphorus leaching.