Long-term Fertilizer Application Alters the Balance and Vertical Distribution of Phosphorus in a Calcarosol
The information on the distribution of P fertiliser in soil profile would be beneficial for better P management in farming systems. The aim of this study is to investigate how the long-term application of fertiliser P affects the vertical distribution of P in the soil and P balance. Soil samples were collected from a long-term permanent P fertiliser trial and were sequentially extracted for P fractions. There was a net negative P balance over the 66 years in the niI-P and low P (3 kg P·ha-1) treatments. In contrast, applying 12 kg P·ha-1 to each wheat crop led to a highly positive P balance of 106 kg P·ha-1 in this soil, resulting in P accumulation in the top 10 cm. Nil and low P application rates resulted in lower soil Pi content at 520 cm depth. The transformation of the residual P fertiliser into all Pi fractions suggests that the applied P had transferred into different P forms which are either readily available or sparingly available to subsequent crops.
Calcarosol P balance P history Phosphorus fractionation Phosphorus transformation
Dang Thanh Vu Caixian Tang Roger Armstrong
Department of Agricultural Sciences,La Trobe University,Victoria 3086,Australia Institute for Soils Department of Agricultural Sciences,La Trobe University,Victoria 3086,Australia Department of Primary Industries,Victoria 3401,Australia
国际会议
杭州
英文
124-126
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）