Abstract
A field experiment was conducted to evaluate impact of seaweed (Kappaphycus sp. and Gracilaria sp.) saps on chemical soil health, growth and yield of Vigna mungo. Foliar application of saps was carried out 35 days after sowing and at flowering with four concentrations (2.5, 5, 10 and 15%) of K-sap and G-sap separately, 7.5% of K-sap + 50% RDF and control. At harvest, highest build up of organic carbon was recorded due to 15% K-sap foliar application while highest available N was observed due to 10 and 15% K-sap. Foliar application of 7.5% K-sap + 50% RDF and 5% G-sap supported the highest available P and K in soil at harvest, respectively. At flowering, highest nodule number of 43 plant−1 was recorded due to 5% G-sap. Foliar application of seaweed saps at various concentrations, except 2.5%, enhanced the grain yield by 27.43% over control. The foliar application of 7.5% K-sap + 50% of RDF also produced the 25.73% higher grain yield over control which was at par with those of other treatments, saving 50% of chemical fertilizers vis-a-vis environmental pollution
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