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2Senior Scientist (Agronomy), Regional Agricultural Research Station (RARS), Lam-522 034, Guntur, Andhra Pradesh, India
3Scientist (Plant Breeding), Regional Agricultural Research Station (RARS), Lam-522 034, Guntur, Andhra Pradesh, India
4Principal Scientist (Pulses), Regional Agricultural Research Station (RARS), Lam-522 034, Guntur, Andhra Pradesh, India
A field experiment was conducted at Regional Agricultural Research Station, Lam, Guntur during kharif seasons of 2012 and 2013 to study the effect of seaweed liquid fertilizers on growth and yield of blackgram on deep black clay loam soils. The seaweed extracts, viz., Kappaphycus alvarezii and Gracilaria edulis were applied to the foliage twice at diverse concentrations (0, 2.5, 5.0, 7.5, 10.0 and 15.0% v/v) during crop growth period. Control plot was sprayed with water. Foliar application of either Kappaphycus and Gracilaria at flowering stage and pod development stage resulted in significant increase in plant height, branches per plant, number of pods per plant, test weight (100 grain) and grain yield over the control. It was found that both the extracts were very effective and enhanced the growth and yield. The seed yield had increased by 60.8% and 50.8% with foliar application of Kappaphycus sap and Gracilaria sap, respectively when applied at 10% concentration over the control (water spray).