Dosagens de biofertilizantes na cultura da alface

Abstract

The increase in the productivity of a crop is directly linked to the nutrition offered to it, and it is commonly supplied via soil with the supply of materials of mineral origin. Because mineral fertilizer is a finite resource, alternative products are currently being sought, or that will complement fertilization, with fertilizers with organic material in this category, often resulting from discarding. These organic materials can also be enhanced, using transformations through fermentations, generating biofertilizers, products with greater nutritional efficiency for plants. The objective of the present work was to evaluate three types of biofertilizers, based on bovine manure, swine manure and humus in different concentrations, and enriched with efficient microorganisms, on lettuce culture. The experiment was conducted on a private property in the municipality of Santo Cristo, state of Rio Grande do Sul. The experimental design used was completely randomized, with five replications in a 3 x 5 factorial scheme, in which the treatments represented the combination of the three types of biofertilizer (Bovine Dung, Pig Dung and Humus,) the five concentrations (T1: 0%, T2: 2.5% T3: 5 T4: 10%, T5: 15%), in foliar application every 7 days, from the fourth day of transplanting the seedlings, totaling 6 applications in the whole experiment. In the factors plant height, chlorophyll, leaf length, leaf width, dry leaf weight, green leaf weight and leaf health, the data were not significant. In the plant diameter factor, swine manure obtained higher averages, not differing statistically from humus. For green mass values of stem, an interaction between concentration and type of biofertilizer was observed, with 10% humus being the concentration with the greatest gains. For green root mass, the humus biofertilizer obtained the highest values, not differing statistically from swine manure. Despite not being significant in some parameters, the data from humus-based treatments stood out, in addition to pointing to an optimal dose of biofertilizer with this source of organic material (10%), which may serve as a starting point for choosing doses or treatments for future studies with its use.