Chemical depletion of cumulative phosphorus in soils

Abstract

Abstract: Cumulative phosphorus was defined as the phosphorus which was unavailable for plants and accumulated in soils fertilizer application. In this paper, chemical depletion of cumulative phosphorus in soils was studied by methods of batch equilibrium, kinetic, and anionic exchange resin membrane. The results showed that desorption amount of cumulative Pincreased with time increasing, and the desorption process was consonant with second order kinetic equation. Release rate of Pin different treatments was in order of PK>NPK>NK. The amount and rate of Preleased from red soil were higher than those of Fluvio aquic soil. Desorbed Pwas significantly correlated with soil available Pand Puptake by Plant. The maximum utilization of cumulative Pin soils was about 45% of total phosphorus.

Key words: Cumulative phosphorus, Chemical depletion, Soil, salt stress., coastal wetland, endophytic fungi, Phragmites australis

CLC Number:

S513

ZHENG Chunrong, CHEN Huaiman, ZHOU Dongmei, TU Cong, QIN Shengwu, GU Yichu . Chemical depletion of cumulative phosphorus in soils[J]. Chinese Journal of Applied Ecology, 2002, (5): 559-563.

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