Doses do biofertilizante “Biocuna” na produtividade da alface crespa em casa de vegetação.

Abstract

Lettuce is the most important leafy vegetable in the world and is of great importance in Brazil due to the plant's nutritional quality, ease of management, and availability. The crop requires large quantities of soluble fertilizers. Organic and agroecological cultivation of this vegetable presents itself as a possible alternative, encompassing concepts of greater environmental, economic, and social sustainability. In this work, the objective was to evaluate the effect of different doses of liquid aerobic biofertilizer applied via foliar application on the development of curly lettuce plants of the cultivar "Grand Rapids TBR" under protected cultivation. The experiment was conducted between May and August 2025 at the Porto Grande Agricultural Fields, IFAP Experimental Farm. A completely randomized design (CRD) was used, with seven treatments (T1 = 0% (control), T2 = 3%, T3 = 6%, T4 = 9%, T5 = 15%, T6 = 20%, and T7 = 30%, applied via foliar application at the recommended dose), with three replications. The applications were carried out using a manual sprayer with a maximum capacity of 350 ml, using 100 ml of the "Biucuna" biofertilizer solution plus water in their respective doses in each plot, with one application per week. The experimental plots consisted of 0.6 m² plots with spacing of 0.20 m between plants and 0.25 m between rows, composed of 12 plants excluding the borders, with evaluation of 2 plants from the center of the plot. Three plots were transplanted, measuring 4.5 m in length by 1 m in width and 0.15 m in height, these subdivided into seven plots of 0.60 m². No significant influence of the treatments on the variables was observed. Stem Length (SL), Stem Diameter (SD), Number of Commercial Leaves (NCL), Number of Non- Commercial Leaves (NCLL), Stem Fresh Mass (SFM), Leaf Fresh Mass (LFM), Shoot Fresh Mass (SFPM), Root Fresh Mass (RFM), Total Fresh Mass (TFM), Leaf Dry Mass (LDM), Root Dry Mass (RDM), Stem Dry Mass (SDM), Shoot Dry Mass (SDM), Total Dry Mass (TDM). Application of the aerobic liquid biofertilizer "Biocuna" at different doses did not significantly affect the growth, development, and productivity of curly lettuce in a protected environment in Porto Grande - AP. Environmental conditions, especially high temperatures, had a greater influence on crop development. I recommend further studies with different growing seasons.