Evaluación de tres dosis de potasio en la producción de lechuga (Lactuca sativa l.) var. crispa bajo el sistema hidropónico en invernadero

Abstract

The present investigation proposes: to evaluate three doses of potassium in the production of lettuce (Lactuca sativa L.) var. crispa, under the hydroponic system in the greenhouse of the experimental area of the department of horticulture of the ESPOCH; a completely randomized block design was used with three treatments and three repetitions; the doses evaluated were: low dose (DB) with 224,33 ppm, medium dose (DM) with 470 ppm and high dose (DA) with 716,67 ppm. Parameters were evaluated such as: percentage of capture, number of leaves, height of the plant, root length, fresh and dry weights of the aerial part and root, potassium content in leaves and root, days to harvest, yield per net plot and hectare and the economic analysis was carried out according to the relation benefit/cost. In all the treatments under study, 100% of the capture was obtained, however, the best results for most of the other parameters evaluated in all the evaluation dates were obtained with the low dose (DB) with 16,67 leaves, height of the plant of 19,61 cm of root length of 36,40 cm, fresh and dry weights of the aerial part and root of 193,01; 36,65; 15,12 and 2,42 g respectively; yield per net plot of 2,04 kilos and per hectare of 15338,75 kilos, and the highest cost benefit with 4,63 dollars equivalent to 362,75 %. While the highest content of potassium in leaves and root to DDT was obtained with the average dose (DM) with 5,13 and 6,00 % of total potassium, respectively. The commercial maturity was 42 DDT for all the treatments, maintaining turgor in the plants throughout the cycle. From the agronomic and economic point of view it is recommended to use a nutritive solution containing 224,33 ppm of potassium. Keywords: <POTASSIUM>, <HYDROPONIC SYSTEM>, <TURGENCE>