Effects of rates and application times of molybdenum on common bean crop

Abstract

Two experiments on molybdenum rates for bean crop were carried out in Viçosa and Coimbra, in the Zona da Mata area of Minas Gerais state, Brazil. A 2 x 5 factorial experiment in a randomized complete block design was utilized; factors were two cultivars (Ouro and Ouro Negro) and five rates of Mo (0, 15, 30, 60, and 120 g/ha). The micronutrient was applied as foliar spray, 25 days after plant emergence. Two experiments on application times of Mo in bean crop were also carried out; they included nine treatments: no Mo and 20 g/ha of Mo applied as foliar spray 7, 14, 21, 28, 35, 42, 49, and 56 days after plant emergence. Ouro Negro was the bean cv. utilized. All four experiments received a uniform application of 4-14-8 at the rate of 600 kg/ha. It was found that the highest bean yields were obtained with 80-90 g/ha of Mo. The best application time was 14 to 28 days after plant emergence.