Nicotinamide and phytohormones as biostimulants in common bean

ABSTRACT The cultivation of beans (Phaseolus vulgaris L.) is of great importance to the national economy since they are grown in almost all regions of Brazil and the use of biostimulants based on phytohormones and plant vitamins can improve the yield of the crop. This work aimed to evaluate the effects of the application of the vitamin nicotinamide and phytohormones as biostimulants on bean plants. The experimental design was carried out in randomized blocks in a 2 x 5 factorial scheme with 4 replicates. The treatments consisted of the application of five doses of nicotinamide (0, 200, 400, 600 and 800 mg L-1) in the presence or absence of phytohormones containing auxin, gibberellin and cytokinin. The growth characteristics, production components and productivity of the bean grains were evaluated. The use of phytohormones and nicotinamide alone or together favored the growth, production components and grain productivity of the bean plant. The range of 366 to 469 mL L-1 nicotinamide achieved the highest values for the growth variables, production components and grain productivity of the bean plant, with 414 mL L-1 being the most suitable to achieve higher grain productivity.