An Asian Journal of Soil Science

M. Raghavendra Reddy ¹, Lokesh Patil ¹, P. N. Siva Prasad ¹, G. S. Yogesh ¹, H. C. Prakasha ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences (G.K.V.K.), Bengaluru (Karnataka), IN

Abstract

Wetland rice systems in Asia make a major contribution to global rice supply. The system is also able to maintain soil fertility on a sustainable basis. The essential components of wetland rice culture comprise cultivation of land in the flooding, puddling and transplanting of rice seedlings into puddled rice paddies, and growing the rice crop under flooding. The wetland rice system, growing rice in submerged soils has a great ameliorative effect on chemical fertility: largely by bringing pH in the neutral range, resulting in better availability of plant nutrients and accumulation of organic matter. Submergence bring a lot changes in redox potential which in turn gives the idea of reduction of nutrients to release to soil solution to make available to plant. This article revealed the dynamic changes of soil pH, electrical conductivity and Redox potential on submergence.

Keywords

Flooding, Submergence, Soil pH, Electrical Conductivity, Redox Potential.

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P. Veeranagappa ¹, H. C. Prakasha ¹, K. R. Ashoka ¹, M. M. Venkatesha ², M. B. Mahendra Kumar ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), IN
2 Department of Agronomist, C.C.R.I., Balehonnur (Karnataka), IN

Abstract

A field experiment was conducted on a Typic Haplustalf with sandy loam texture to study the effect of Zn-E compost on soil properties and distribution of zinc fractions in soil. The experiment was laid out in Randomized Complete Block Design with three replications. There were eight treatments comprising of recommended dose of compost, NPK fertilizers, ZnSO₄ and zinc enriched compost. Application of NPK + compost + ZnSO₄ at 20 kg ha^-1 and different levels of Zn-E compost treated plots recorded significantly higher values of primary, secondary and micronutrients in soil at tillering, panicle initiation and at harvest stages. A slight improvement in soil pH, electrical conductivity and organic carbon content noticed higher values in NPK + zinc enriched levels followed by package of practice. The application of Zn-E compost increased the amount of zinc present in different fractions. Increase in amount of zinc present in different zinc fractions might be due to the higher solubility and mobility of the added zinc source. Water soluble plus exchangeable fractions significantly increased with the enrichment of compost.

Keywords

Zn-E Compost, NPK, Zinc.

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