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A field experiment was conducted at the Agricultural farm of Visva-Bharati University, Birbhum, West Bengal during Pre-kharif (Summar) season of 2012, to study the effect of foliar spray of seaweed extracts (prepared from Kappaphycus alvarezii & Gracilaria crassa) on the growth and productivity of black gram. The foliar spray was applied thrice at different concentrations (0, 5.0, 7.5, 10.0 and 15.0% v/v) of seaweed extracts. Foliar applications of seaweed extracts significantly enhanced the growth and yield attributes. The highest grain yield was recorded with applications of 15% Kappaphykus + recommended dose of fertilizer which at par wth 15% Gracilaria extracts + RDF resulting in an enhanced by 51 and 44% grain yield, respectively compared to the water applied plots. The highest straw yield was also achieved with the application of 15% seaweed extracts. The nutrient uptake (N, P and K) which influenced due to the application was also with seaweed extract.

Effect of seaweed extracts on the growth, yield and nutrient uptake of black gram (Vigna mungo L.) in the red and lateritic belt of West Bengal