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A study was conducted in the Onattukara sandy plain (AEU 3) of Kerala to assess the available nutrient status of the region to develop a multi nutrient mixture for balanced crop nutrition and to evaluate the effect of multi nutrient mixture on growth and yield of okra. Two hundred georeferenced soil samples were drawn at random from twenty soil series of the Onattukara region and analysed for 13 soil fertility parameters. The soil was very strongly acidic with high level of phosphorus, low oxidisable organic carbon and available potassium and wide spread deficiencies of calcium, magnesium, boron and zinc. Micronutrient fertilizer requirement was computed based on the available micronutrient status of the region and crop requirement. A multi nutrient mixture having a composition of Zn (9.5%) + B (2.6%) +Cu (1.2%) +Mg (2.4%) +N (0.46%) @ 20kg ha-1 was developed and the effect of multi nutrient mixture was assessed in the field experiments using okra variety Varsha Uphar as the test crop. Application of soil test based NPK and secondary nutrients + foliar application of 0.5 per cent solution of computed dose of nutrient mixture @ 5 kg ha-1 in two splits at 15 DAS and 30 DAS (T7) yielded significantly higher (11.3 t ha-1) over rest of the treatments with a B: C ratio of 3.02. Soil status of micronutrients in the experiment site before the experiment was Zn (0.27 mg kg-1), Cu (0.21 mg kg-1) and B (0.17 mg kg-1). After two consecutive applications of multi nutrient mixture, the soil status of Zn, Cu and B were in the range of 0.62 to 1.58 mg kg-1, 0.74 to 0.99 mg kg-1 and 0.19 to 0.31 mg kg-1 respectively. In general the highest nutrient content and uptake in shoot and fruit were recorded by T7. Application of multi nutrient mixtures customized for agro ecological units and crops ensured increased yield and sustained soil health.

Effect of Customized Nutrient Mixture on Yield of Okra in Onattukara Sandy Plain