Eficiência agronômica de adubação foliar contendo aminoácidos na cultura da soja (Glycine max (L.) merrill)

Abstract

The practice of foliar fertilization with amino acids has as objective to provide productivity increase, however, there are some questions regarding efficiency of provided amino acids to complement crop nutrition. This work aimed to verify cobalt, molybdenum, zinc, sulphur and amino acids-based product’s efficiency of applicability in soy productivity. The experiment was performed in oxissol in trial area at Universidade Federal da Fronteira Sul campus Cerro Largo. Trial design was of blocks at random in factorial plan 2 x 4, made up of eight treatments with four reruns. The treatments were two doses of triple superphosphate at seeding time (0 and 224 kg ha -1 ) and four treatments with application of foliar fertilization in different phonological stage, being the first treatment with three applications (V 5 , R 1 , R 4 ), second treatment with two applications (R 1 , R 4 ), third treatment with one application (R 4 ) and fourth treatment with no application of foliar fertilization. Analyzed variable were productivity, number of pods in each plant, number of grains in each pod, number of grains in each plant, mass of thousand grains, mean of foliar area in stage R 5 , mean of plants tallness in stage R 5 , dry mass in aerial part in stage R 5 . The data were submitted to variance analysis and Tukey test. Phosphate fertilization in seeding and foliar applications did not affect evaluated variables. These results can be explained by high levels of nutrients in soil associated to good distribution of rain during the crop development. Therefore, we conclude that the product used did not affect the development and productivity of crops in the conditions where this experiment was performed.