Abstract
In a greenhouse experiment, the effect of Sesbania aculeata green manure (10 g kg-1 soil) on soil solution Fe concentration, electrochemical changes and Fe, Mn, Zn, N, P, K and S content of rice was investigated under submerged conditions in a loamy sand soil (an Ustifluvent, pH 8.6). Soil solution samples collected anaerobically under gravity at 14 days interval up to 84 days of submergence were analysed for Eh (redox potential), pH, EC (electrical conductance), HCO3 - and Fe2+ concentration. Green manuring under submerged conditions markedly decreased soil solution pH and pE, and increased EC, partial pressure of CO2 and Fe concentration. Maximum Fe concentration, EC and partial pressure of CO2 and minimum pE and pH were obtained at 14 days. Despite large variations in pH, pE and Fe concentration, the values of the expression: pE — pFe2+ + 3pH were nearly constant and close to the standard values of 17.9, indicating that the Fe(OH)3-Fe2+ system controlled the solubility of Fe2+ throughout the period of submergence. However, after the peak of Fe2+ concentration in the soil solution, the Fe3(OH)8—Fe2+ and Fe(OH)3—Fe3(OH)8 systems were predominant in untreated control and green manured soil, respectively. Dry matter yield and Fe, Mn, Zn, N and S content of rice significantly increased with incorporation of green manure.
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© 1995 Springer Science+Business Media Dordrecht
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Sadana, U., Chahal, D. (1995). Iron availability, electrochemical changes and nutrient content of rice as influenced by green manuring in a submerged soil. In: Abadía, J. (eds) Iron Nutrition in Soils and Plants. Developments in Plant and Soil Sciences, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0503-3_15
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DOI: https://doi.org/10.1007/978-94-011-0503-3_15
Publisher Name: Springer, Dordrecht
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