Phosphorus fractionation and losses in an acidified purple soil

doi:10.11686/cyxb2017069

Abstract

Abstract: Phosphorus (P) fractionation was developed to quantitatively analyze P fraction transformation and P loss apportionment. In order to investigate the effect of P fertilization on P fractions and apportionment of P loss forms, a plot experiment with three P levels (0, 60 and 120 kg P₂O₅/ha) was conducted in a mustard crop grown on an acidified purple soil. Phosphorus fractions and P loss apportionment were analyzed using a new P fractionation method which is much less variable than the Hedley fractionation method and better at characterizing the P loss index. The P loss index was positively correlated with P fertilization and the main P loss source was soluble P in NH₄F and NaOH. Increasing P fertilization significantly increased the free P, resin available P, Ca₂-P and Ca₈-P, while zero P application significantly decreased the Ca₂-P, Ca₈-P and iron or aluminum bound P. In conclusion, the new P fractionation method was a viable and better method for characterizing the quantitative assessment of P loss in non-point source pollution. The study also showed that soil P loss was mainly of soluble P and that P fertilization greatly influenced the transformation of P fractions in a labile and chronic phosphorus pool.

ZHANG Yang, LEI Ping, XIE De-Ti, NI Jiu-Pai. Phosphorus fractionation and losses in an acidified purple soil[J]. Acta Prataculturae Sinica, 2017, 26(11): 22-34.

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