Department of Agronomy, S.V. Agricultural College, ANGRAU, Tirupati – 517 502.
A field experiment was conducted at S.V. Agricultural College Farm, Tirupati, Acharya N.G. Ranga Agricultural University, Andhra Pradesh, India during rabi, 2021-22 to study the effect of soil and foliar potassium fertilization on growth and yield of blackgram. The treatments consists of three potassium levels as first factor viz., 20, 30, 40 kg K2O ha-1 and five foliar sprays as second factor viz., no foliar spray, water spray at flowering and pod development stages, 0.5% KNO3 at flowering and pod development stages, 1% KCl at flowering and pod development stages and 1% KH2PO4 at flowering and pod development stages imposed in a randomized block design with factorial concept and replicated thrice. Among the potassium levels tried, soil application of 40 kg K2O ha-1 resulted in taller plants, higher drymatter production, seed yield and haulm yield, which was comparable with soil application of 30 kg K2O ha-1. Among different foliar sprays tried, tallest plants, higher drymatter, seed yield and haulm yield were recorded with application of 1% KH2PO4 at flowering and pod development stages, which was on par with 1% KCl and 0.5% KNO3 at flowering and pod development stages.
KEY WORDS: Blackgram, Potassium, Growth and Yield.