CRESCIMENTO E PRODUÇÃO DE ALFACE EM RESPOSTA A NÍVEIS DE DRILOCOMPOSTO E NPK

The objective of this research was to evaluate the effects of drilocompost levels and NPK fertilization on lettuce growth and yield. The experiment was carried out in a greenhouse, in a completely randomized design in a 6 x 2 factorial scheme, with 4 replications, considering six levels of drilocompound (0; 25; 50; 75; 100 and 125 g/plant) and absence and presence of. NPK fertilization. The variables analyzed were: total and commercial number of leaves, the mass of fresh and commercial fresh shoots, in addition to the total and commercial shoot, root and total dry mass. There was a double interaction between drilocompost and NPK fertilization for the evaluated variables, except for the root dry mass that had an isolated effect of the levels of the organic fertilizer used. NPK fertilization increased lettuce growth and yield when no dril compost was applied. Similarly, that levels of this fertilizer increased lettuce growth and yield only in the absence of NPK.Objetivou-se nesta pesquisa avaliar os efeitos de níveis de drilocomposto e da adubação com NPK no crescimento e produção de alface. O experimento foi realizado em casa de vegetação, no delineamento inteiramente casualizado em esquema fatorial 6 x 2, com 4 repetições, considerando seis níveis de drilocomposto (0; 25; 50; 75; 100 e 125 g/planta) e ausência e presença de adubação com NPK. As variáveis analisadas foram: número de folhas total e comercial, a massa da parte aérea fresca comercial e total, além das massas da parte aérea total e comercial, da raiz e total secas. Verificou-se interação dupla entre o drilocomposto e a adubação com NPK para as variáveis avaliadas, exceto para a massa seca de raiz que teve efeito isolado dos níveis do adubo orgânico utilizado. A adubação com NPK aumentou o crescimento e produção de alface quando não teve aplicação do drilocomposto. Da mesma forma, que os níveis deste adubo aumentou o crescimento e produção de alface somente na ausência de NPK

Growth and production of lettuce on substrates based on detritivorous earthworms drilocomposts

Alternative plant growing inputs have been increasingly sought out to reduce the economic-environmental impacts of intensive use of synthetic fertilizers in conventional agriculture. This study aimed to evaluate the production components of lettuce in response to the use of earthworm compost in substrate compositions. The experiment was carried out in a greenhouse using a completely randomized design in a 3 x 5 factorial scheme, with six replications, testing three earthworm species (Eisenia andrei, Eudrilus eugeniae, and Perionyx excavatus) and five drilocompost ratios (0%, 25%, 50%, 75%, and 100%), produced by these species and added to the composition of substrates by mixing them with soil. Production components evaluated comprised total and commercial numbers of leaves, commercial fresh weight, as well as shoot and total fresh and dry weights. Lettuce production components increased as the drilocompost ratio in substrates was raised, regardless of the earthworm species. Moreover, the addition of 25% this drilocomposted material in the dystrophic soil was enough to improve its fertility condition. In general, substrates prepared with worm castings from Perionyx excavatus and Eudrilus eugeniae were more efficient in increasing lettuce production components than that from Eisenia andrei.Alternative plant growing inputs have been increasingly sought out to reduce the economic-environmental impacts of intensive use of synthetic fertilizers in conventional agriculture. This study aimed to evaluate the production components of lettuce in response to the use of earthworm compost in substrate compositions. The experiment was carried out in a greenhouse using a completely randomized design in a 3 x 5 factorial scheme, with six replications, testing three earthworm species (Eisenia andrei, Eudrilus eugeniae, and Perionyx excavatus) and five drilocompost ratios (0%, 25%, 50%, 75%, and 100%), produced by these species and added to the composition of substrates by mixing them with soil. Production components evaluated comprised total and commercial numbers of leaves, commercial fresh weight, as well as shoot and total fresh and dry weights. Lettuce production components increased as the drilocompost ratio in substrates was raised, regardless of the earthworm species. Moreover, the addition of 25% this drilocomposted material in the dystrophic soil was enough to improve its fertility condition. In general, substrates prepared with worm castings from Perionyx excavatus and Eudrilus eugeniae were more efficient in increasing lettuce production components than that from Eisenia andrei. Palavras-chave: Cultivo orgânico, Eisenia andrei, Eudrilus eugeniae, Lactuca sativa, Perionyx excavatus