Inorganic Phosphorus Fractions and Phosphorus Availability in a Calcareous Soil Receiving 21-Year Superphosphate Application
作者： Jun WANG , Wen-Zhao LIU , Han-Feng MU , Ting-Hui DANG
DOI: 10.1016/S1002-0160(10)60018-5
关键词:
摘要: A long-term (21-year) field experiment was performed to study the responses of soil inorganic P fractions and availability annual fertilizer application in a calcareous on Loess Plateau China. Soil Olsen-P contents increased by 3.7, 5.2, 11.2 20.6 mg kg(-1) after 21-year at 20, 39, 59, 79 kg ha(-1), respectively. Long-term addition also total (Pi) significantly. The were order Ca(10)-P > Ca(8)-P Fe-P Al-P occluded Ca(2)-P receiving application. Fertilizer Ca-P, as well their percentages relative Pi. Pi but nor percentages. content remained unchanged while its percentage declined with increasing rate. All correlated 90% variations could be explained fractions, direct contribution predominant. superphosphate would facilitate accumulation Ca(8)-P, thus improve availability.
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