Aplicação de bioestimulante na cultura da soja : produtividade e qualidade de grãos

Abstract

Biostimulants are plant regulators associated withoth erbiochemical components that contribute to the hormonal balance of plants, enabling greater expression of genetic potential. For better understanding, it was the objective of this work to evaluate the plant morphological characteristics, yield and physical quality of soy bean under theapplication of biostimulant based on algae extra ct. The experiment was conducted in the experimental field of Pastorello Agronomic Consulting and Research, from October 2017 to February 2018.The design used was randomized blocks, consisting of 8 treatments and 4 repetitions.The treatments wered istributed in 1 control treatment (control) and 7 other treatments in which variations of products, doses and time of application were performed. The applications were in some cases in seed treatment (TS), or in other stadiums of culture. The productsused in the TS wereNemat + Ecotric + Bradyrhizobium+ CoMo, the others were: Azospirillum (nitrogen-fixingbacteria), Ecklonia maximus and Ascophylumnodosum, the latter two biostimulants based on seaweed extracts. After harvesting, morphological and plantyield evaluations were carried out: plantheight, firsts train insertion, stemdia meter, pods of 1 °, 2 ° and 3° and grain mass per plant. For qualitative evaluation physicalanal yzes were performed: bulk density and mass one thousand grains. The obtained data were submitted to the analysis of variance and the means of the treat ments compared by theTukey testat 5% of significance.The treatmentsdidnotexertsignificantinfluenceontheyieldcharacteristicsofsoybean (yield, plant height, stem diameter, number of beans per pod and grain mass per plant), and on the physical property bulk density. The mass of one thousand grains variedbe twe entreatments. The treatment witht hehig hestyield wasthe T5 (0.03 L ha -1 [TS] + 0.80 L ha -1 [algaeextract] + Azospirillum) procedure performed during the treatment of seeds with the addition of algae extract, resulting in 66 sc ha-1 ; The lowestyieldwas 45.60 sc ha-1 for T2(0.03 L ha -1 [TS]) and the treatment of seeds with out biostimulant was based on algae extract.