Produção de alface a partir de sementes orgânicas e convencionais sob adubação orgânica com vermicomposto bovino em ambiente protegido

Abstract

With objective to evaluate the production of 'Grand Rapids' lettuce from organic and conventional seeds under organic fertilization with bovine manure vermicompost in polyethylene greenhouse, based on the recommendation indexes of the Comissão de Química e Fertilidade do Solo - RS / SC (2016) was developed an experiment in the year 2016 in the period from 07/26/2016 to 08/30/2016, a deposit of data of the transplant of the seedlings. A polyethylene greenhouse, model chapel, was used in the experimental area of the Faculdade de Agronomia Eliseu Maciel, Universidade Federal de Pelotas, Capão do Leão Campus, Rio Grande do Sul, Brazil. A 'Grand Rapids' cultivar was chosen, using two types of seeds: organic seed (S1) and conventional seed (S2), submitted to bovinemanure vermicompost (BV) fertilization in the previous way: T1 (0,5 ROLAS VB); T2 (1,0 ROLAS VB) and T3 (1,5 ROLAS VB). The experiment was carried out in a randomized block design. The variables studied were: above ground biomass fresh and dry, fresh and dry root phytomass, plant diameter, leaf area, leaf number, root length, root density, shoot root system and macronutrients, crosses of laboratorial efforts. The bovine manure vermicompost used as fertilizer favors the adequate production of the 'Grand Rapids' lettuce crop, when applying the 1.0 and 1.5 times the recommendation of the Comissão de Fertilidade do Solo RS/SC (2004). Regardless of the origin of the 'Grand Rapids' lettuce seed, the response regarding fertilizer application with bovine manure vermicompost was satisfactory, as it met the recommendation for plant diameter and leaf area. The NO3 - content in 'Grand Rapids' lettuce leaves with the application of bovine vermicompost, is within the FAO standards for hardwood accumulation. The residual effect of bovine manure vermicompost on the soil, after harvesting the 'Grand Rapids' lettuce, allows the continuation of a next crop without the addition of fertilizer. The behavior of the 'Grand Rapids' cultivar with organic and conventional seeds under organic fertilization is similar.