Posição da maniva e aplicação de Azospirillum brasilense influenciam caracteres agronômicos da mandioca

Abstract

The objective of this assignment was to evaluate the development of cassava as a function of the placement of the manioc in combination with Azospirillum brasilense. The experimental design used was completely randomized, with a 2x2 factorial design, one factor being the positioning [horizontal (PH) and vertical (PV)] and the other the application of A. brasilense [with (+Azos) and without (-Azos)], with variable repetitions per treatment. After 11 days of planting (DAP) and up to 30 DAP, the germination percentage was measured, and from 30 DAP to 150 DAP, the following variables were evaluated: stem diameter (SD), number of sprouts (NS), main sprouts height (MSH) and leaflet length (LL). At 150 DAP in the final collection, the weight of the area part (WAP), the number of commercial roots (NR) and the total production (TP) were evaluated. Analysis of variance and principal components was performed. The positioning of manioc stakes significantly influenced the initial growth results of the cassava plant in most parameters evaluated. The PV promotes a greater acceleration of germination with 63% of the stakes germinated at 17 DAP compared to the PH which had only 3% of visible shoots on that same evaluation date. However, after the first 30 DAP, the PH is the treatment that stands out in most variables. The presence of +Azos manifests a stimulating effect for all variables measured in all five evaluations performed. The combination of PH+Azos is the treatment that best responds and promotes the highest productivity values under the conditions tested.