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MICRONUTRIENT AVAILABILITY TO CEREALS FROM CALCAREOUS SOILS: II. EFFECT OF FLOODING ON ELECTROCHEMICAL PROPERTIES OF SOILS

RAHMATULLAH, F. M. CHAUDHRY and A. RASHID
Plant and Soil
Vol. 45, No. 2 (OCTOBER 1976), pp. 411-420
Published by: Springer
Stable URL: http://www.jstor.org/stable/42933384
Page Count: 10
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MICRONUTRIENT AVAILABILITY TO CEREALS FROM CALCAREOUS SOILS: II. EFFECT OF FLOODING ON ELECTROCHEMICAL PROPERTIES OF SOILS
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Abstract

The effect of flooding on chemical composition of solutions of two alkaline calcareous soils were studied for incubation periods of 0, 2, 3, 4, 5 and 8 weeks. Flooding slightly reduced pH of both the soils. The concentration of Ca, Mg, HCO₃, Mn, Fe, P, and total soluble salts markedly increased. This occurred rapidly in the beginning but at a much slower rate later on during incubation. Drying the soils from 7th to 8th week of submergence greatly depressed their concentration. Flooding had no effect on Cu but increased Zn concentration. The contents of various ions in submerged soils generally had little relationship to those in dry soils. Manganese and Fe strongly depressed 65 Zn absorption by rice (Oryza sativa L.) from solution cultures. Flooding induced increased contents of various ions in soil solutions appear to be a major cause of accentuating Zn and Cu deficiency in rice and of obscuring the predictability of soil tests for Zn and Cu availability to lowland rice.

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