Produção de milho sob influência de produtos atenuantes do estresse hídrico.

Abstract

Corn is a crop of high economic expression for Brazil and of great social and cultural importance for the semiarid region of Northeast Brazil. One of the factors limiting corn production in this region is water scarcity. Plant growthpromoting bacteria (BPCP) have been shown to be a viable and ecologically correct alternative to overcome water stress in crops with high water requirements such as corn. In view of this, it aimed to evaluate the productive performance of the corn crop submitted to irrigation depths and water stress attenuating products. The experiment was conducted at the experimental farm of the Federal University of Campina Grande, located in the city of São Domingos - PB. The design used was in randomized blocks, in a split plot scheme where the plots corresponded to four irrigation depths (40; 60; 80 and 100% of ETo) and the subplots to four products: C = Control - without product application attenuating water stress; P1 = Biobaci (Bacillus subtillis); P2 = No- Nema (Bacillus amyloliquefaciens) + Azokop (Azospirillum brasiliensis) and P3 = Product from Empresa Ecofertil LTDA (containing Co and Mo) with four replications, making 16 plots and 64 subplots. At the end of the crop cycle, water use efficiency, weight of 100 grains, productivity and their relative values were evaluated. The use of No-Nema (Bacillus amyloliquefaciens) + Azokop (Azospirillum brasiliensis) increased the mass of 100 grains and the productivity under high water scarcity, the efficiency in the use of water, relative productivity and relative mass of 100 grains presented the best results under severe water scarcity when using the product containing Co and Mo.