EFFECT OF GRADED LEVELS OF WATER SOLUBLE FERTILIZERS ON GROWTH, YIELD OF MULBERRY AND COCOON QUALITY
A field experiment was conducted at College of Sericulture, Chintamani, Karnataka, in randomized block design with seven treatments replicated thrice with drip irrigation. The treatments comprises of two sources of fertilizers viz., water soluble fertilizers (WSF) and conventional fertilizers (CF) at four levels (25, 50, 75 and 100 % RD of WSF through fertigation) as per the schedule used for application of fertilizers. The type of soil is sandy clay loam in texture with neutral pH, EC of 0.24 dS m-1, 0.62 % organic carbon, medium in available N, low in P and high in K content. Shoot height (m), Number of branches (No./plant) and Total number of leaves (No./plant) were higher in the treatment with 100 % RD with water soluble fertilizers against control and CF. Similar trends were observed for leaf yield/plant and leaf yield/ha. The uptake of N, P & K was higher in fertigation with 100 % RDF through water soluble fertilizes + FYM (RD). But the performance of Silkworm, Bombyx mori L. in terms of cocoon weight (g/10 cocoons), Shell weight (g/10 cocoons) and Shell ratio (%) was higher in the treatment receiving 75 % NPK through water soluble fertilizes (Fertigation) + FYM (RD). These findings indicated that inverse relationship between the nutrient accumulation in mulberry leaves and cocoon parameters in the silkworm B. mori that may be attributed to the increased accumulation of nutrients (particularly nitrogen) leads to decreased production of chlorogenic acid, Flavonal, and increased concentration of 1-deoxynojirimycine might have affected leaf quality and performance of silkworms.
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