Produção, partição de assimilados e trocas gasosas em alface submetida à adubação orgânica e mineral.

Abstract

The objective of this study was to evaluate the cultivation of lettuce subjected to doses NPK provided by different ratios of organic and mineral fertilizers. The experiment was conducted in an area located at the Federal University of Campina Grande (UFCG) in Pombal, during the period from May to July 2014. The design was a randomized block with four replications in a factorial 3x5 where the factor (A) were allocated different concentrations of nutrients N, P and K (50, 100, and 150%) and the factor (B) five mineral and organic fertilizer combinations (100/0, 75/25, 50/50, 25/75 and 0/100). We evaluated the physiological parameters, growth and production. The concentration of 150% of the recommended dose was the most effective for all evaluated parameters; in the proportion 75/25 the concentration of 150% was more effective for all physiological parameters and 25/75 within the concentration of 50% was less effective for these same parameters, the proportion 0/100 and 50/50 was the one with the smallest and the largest values respectively for the leaf area, leaf number, total dry matter, dry weight of leaf, stem and dry mass production. In absolute terms, we can say that the best performance was obtained in lettuce concentration of 150% of NPK doses and in terms of proportion 50/50 it was the one that provided a better behavior for this culture.