Effects of P Rates on Different Fraction Inorganic P Content and Its Transformation in Cinnamon Soil under Simulated Rainfall Conditions

doi:10.7668/hbnxb.2009.03.041

Abstract

Abstract: Simulated soil column was used to study the effects of different P rates on inorganic P content and its trans2 formation in cinnamon soil under average rainfall of Shandong Province. Results showed that total inorganic phosphorus con2 tents of treatments applied with P increased in 0 - 10 cm soil layers when P application rates were increased after simulated rainfall;With plough layers were deepened(from 10 cm to 50 cm),the total inorganic P contents in different layers of P₂ (180 kg/ ha)were the highest. In 10 - 30 cm layers,the total inorganic P contentsof P₃(1 440 kg/ ha)were higher than those of P₁,while those of P₁in 30 - 50 cm layers were higher than those of P₃.At the same time,Contentsof inorganic Pfraction2 ations and the proportionsof those to total inorganic P contents were altered.When applied ratesof Pwere P₁,P₂,P₃,the in2 organic P fractionations and the proportionsof those to total inorganic P contents were shown asfollowsfrom high to low,re2 spectively:Ca₁₀2P >Al2P,O2P > Ca₈2P > Fe2P > Ca₂2P;O2P > Ca₈2P,Ca₁₀2P > Fe2P,Al2P >Ca₂2P and Ca₁₀2P,O2P > Fe2P, Ca₈2P >Al2P > Ca₂2P.With the soil layers rates deepened,the contents of O2P,Fe2P and Ca₁₀2P kept constant,while avail2 able inorganic P sources( Ca₂2P,Ca₈2P and Al2P)decreased;With the intensityof light rain,the P leaching amounts in soils of different treatments of P rates had no obvious differences,while rain intensity increased,soil P leaching amounts of P₃treatment were obviously higher that those of P₁and P₂treatments. Thus,different P rates had obvious effect on total inorgan2 ic P content,inorganic P contents and their transformation;under the rain intensity was over than medium rainfall,P leach2 ing amount of high phosphorus treatment was obviously higher than those of low P treatment

Key words: Simulated rainfall, Inorganic P content, Inorganic P fractionation, P rates, Cinnamon soil

CLC Number:

LI Yan, GAo Yan, ZHANG Ying peng, SUN Ming, CHEN Qing. Effects of P Rates on Different Fraction Inorganic P Content and Its Transformation in Cinnamon Soil under Simulated Rainfall Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(3): 194-200. doi: 10.7668/hbnxb.2009.03.041.

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