Effect of graded doses of N, P and K on the yield and quality of blackgram var. KM-1 grown in rice fallows

Abstract

The field experiment conducted during the third crop season of 1978-79 in the rice fallows of Instructional Farm, College of Agriculture, Vellayani, Trivandrum to study the effect of three levels each of nitrogen {20,30 and 40 kg ha), phosphorus (30, 45 and 60 kg/ha) and potash (10,20 and 30 kg/ha) on the yield and quality of blackgram and economics of fertilizer application to blackgram variety KM-1 revealed that the grain yield was significantly increased by increase in the level of potash. The maximum grain yield of 1757 kg/ha was recorded at 30 kq K20/na. Though the levels of nutrients had no significant influence on protein content, grain protein yield was significantly increased with increase in the leve! of potash, giving the maximum grain protein yield of 410. 86 kg/ha with 30 kg K^O/ ha. The maximum net profit of Rs, 3693.30 was also obtained from the plot which received 30kg KaO/ha.