Tempo de fermentação e concentração de biofertilizante para adubação de batata-doce.

Abstract

Agricultural exploration with the use of agrochemicals is a common activity in Brazil, however, it causes negative impacts on the environment. To minimize these impacts, alternative means must be adopted, such as the use of organic or enriched biofertilizers that meet the needs of crops. Based on this information, it was studied the fermentation time and concentration of biofertilizer enriched with NPK in four fermentation times (10, 20, 30 and 40 days) and two concentrations (5 and 10%) in the sweet potato culture. The experimental design used was in randomized blocks with four replications, in a 4 x 2 factorial scheme. The variables analyzed were: number of leaves; length of the stems; leaf area; photosynthesis; total production of sweet potatoes, the amount of fresh and dry matter of each organ. The results showed that there was a significant difference at 5% probability by the Tukey test between the treatments analyzed. The treatments fermentation times (30 days) and concentration (10%) of the biofertilizer, were the ones that stood out in the accumulation of fresh and dry mass of the sweet potato organs at 120 days after planting (DAP). The highest total yield of sweet potato roots was achieved in the treatment with fermented biofertilizer for 30 days at a concentration of 10% (1027.59g plant-1). It can also be noted that when applying the biofertilizer at 10%, regardless of the fermentation time, it reached a total production of 865.62g plant-1 of sweet potato roots.