Customized Nutrient Management Strategies for Acid Saline Soils (Orumundakan Tract) of Kerala

Transforming Coastal Zone for Sustainable Food and Income Security（2022）

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Abstract

Acid saline soils of Kerala comprise rice-growing soils of Pokkali, Kaipad and Orumundakan tracts. Acid saline soils of Onattukara sandy plain (agroecological unit 3) known as Orumundakan soils covering an area of 2000 ha are distributed in Alappuzha and Kollam districts of Kerala. Rice cultivation in this area is declining due to soil fertility constraints. High soil acidity, salinity and nutritional disorders are the major problems faced during rice cultivation. To revive the rice cultivation in this area, the soil fertility constraints have to be identified and soil-based nutrient management strategies have to be developed so that farmers can take up profitable crops. Hence, the present study has been undertaken to develop a soil-based nutrient management plan for the acid saline soils (Orumundakan soils) of Kerala. To characterize the fertility status of soils, 100 soil samples were collected from paddy fields of Orumundakan tract and analysed for various soil fertility parameters. The data generated were used for assessing soil fertility and preparing customized nutrient management strategies for the region. Based on the new nutrient management plan, field demonstrations were conducted using medium duration rice varieties from Pokkali and Kaipad areas. Soil fertility evaluation of the Orumundakan tract revealed that acidity, salinity and nutritional disorders are the major soil fertility constraints. The soil pH ranged from 2.16 to 5.99 and electrical conductivity (ECe) from 1.5 to 17.5 dS m−1. Widespread deficiencies of Ca, Mg and B and toxicities of Fe and Mn were also observed. Soil test-based recommendation of lime, N, P, K, Mg and foliar application of N-P-K:19-19-19 (1%) at the maximum tillering stage and foliar application of N-P-K:13-0-45 (1%) and Solubor (0.2%) at panicle initiation stage were found to be promising in field demonstrations. The customized nutrient management plan will help the farmers for profitable crop production in this region.

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Key words

Acid saline soils, Customized nutrient management, Orumundakan tract, Soil fertility

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