P. THRIVENI*, B. SANDHYA RANI, N. SUNITHA, M. MADAN MOHAN AND G. KARUNA SAGAR

Department of Agronomy, S.V. Agricultural College, ANGRAU, Tirupati – 517 502.

ABSTRACT

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.