Acúmulo e partição de biomassa e macronutrientes de cultivares de feijão-vagemem cultivo protegido fertirrigado

Abstract

For a better management of fertigation in protected cultivationof vegetables such as snap beans, it is important to know the nutritional requirements of the plants. Thus, weaimedto characterize the biomass and macronutrients accumulation ofbush snap beansgenotypes. For that, an experiment was carried out in greenhouse, where the genotypesUEL-1 and Alessaweregrown in plastic pots with coarse sandas substrateand fertigation by micro sprinklers. Each ten days, plants were sampled and measured the dry matter and the concentrations of elements such asnitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S)for different plant parts, adjusting their accumulation over timeby the gaussian model.The fresh pods yield (kg m-2) was also evaluated. The accumulation of biomass and macronutrients wasintensified from 20 days after emergence (DAE), reaching maximumvaluesnear 50 DAE. The genotype Alessa presented a higher overall accumulation, while UEL-1 was more productive regarding fresh pods, characterizing suchgenotypeas more efficient for using the macronutrients. For both genotypes, N hadthe highest accumulation, followed by K, Ca, P, S and Mg.