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Position: Home > Articles > Leaching of nutrient elements in red soil derived from quaternary red clay Pedosphere 1998,8 (1)

Leaching of nutrient elements in red soil derived from quaternary red clay

作  者：
SHEN RENFANG;ZHAO QIGUO
单  位：
Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008 (China);angeaSystems.com
关键词：
fertilization;nutrient leaching;red soil
摘  要：
A red soil derived from Quaternary red clay was employed to study nutrient leaching with soil columns repacked in laboratory. The objective was to identify the effects of fertilization practices on leaching patterns and magnitudes of Ca~(2+), Mg~(2+), K~+, NH_4~+, and NO_3~-. The treatments were CK (as a control), CaCO_3, CaSO_4, MgCO_3, Ca(H_2PO_4)_2, urea, KCl, and multiple (a mixture of the above-mentioned fertilizers). The fertilizers were added to the bare surface of the soil columns, and then the columns were leached with 120 mL deionized water daily through peristaltic pumps over a period of 92 days. Leaching processes of NH_4~+, and NO_3~- were only measured in CK, urea, and multiple treatments which were directly related to N leaching. Results showed that sole application of CaSO_4, and Ca(H_2PO_4)_2 scarcely had any effect on the leaching losses of Ca~(2+), Mg~(2+), and K~+; the application of MgCO_3 stimulated the leaching of Mg~(2+); the application of CaCO_3 promoted the leaching of Ca~(2+), Mg~(2+) and K~+; urea treatment also promoted the leaching of K~+ and NH_4~+, and NO_3~- leaching mainly occurred at late stage of leaching process in particular; under KCl treatment, leaching of Ca~(2+), Mg~(2+), and K~+ was promoted to a large extent; under multiple treatment, leaching of Ca~(2+), Mg~(2+), K~+, NH_4~+, and NO_3~- was all increased and NO_3~- was mainly leached at the end of leaching process and still had a trend of increase.

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