KETOUNOU, T. R.; http://lattes.cnpq.br/1141748535970223; KETOUNOU, Tankpinou Richard.
Resumen:
Faced with the scenario of water scarcity, especially in semi-arid regions, hydroponic
cultivation is a viable alternative to the production of vegetables, since this technique uses
water rationally and without waste, however, silicate fertilization is necessary, a method
that has been important. in the contribution of the increase in the production of vegetables.
In this sense, the objective was to evaluate the growth and production of lettuce cultivars
under different saline levels using silicon. The experiment was carried out in a protected
environment, at the Vale dos Ipês Rural Property, located in the municipality of São
Mamede-PB. The experimental design used was in subdivided plots with factors arranged
in a 4x2x2 factorial scheme, with four saline concentrations (1.4; 2.0; 2.6 and 3.2 dS m-1),
two doses of Si (potassium silicate ) (0.0; 0.6 mM) and two crisp lettuce cultivars (Leila
(C1) ; Isabel (C2)), totaling 16 treatments with 8 replications. Physiological and growth
parameters were analyzed; gas exchange and photosynthetic pigments (chlorophyll a, b and
total and carotenoids). Salinity reduced physiological and plant growth variables 15 days
after transplanting and nutrient solutions with EC up to 2.4 dS m-1 are recommended for
lettuce production. Gas exchanges decreased with increasing salinity of the nutrient solution
from the level of 2.2 dS m-1. There were decreases in water use efficiency with increasing
salinity. The variation of photosynthetic pigments increased with the increase in EC from
2.2dS m-1. Silicon enabled a better use, positively influencing the analyzed variables; and
its use is advisable in the hydroponic cultivation of lettuce.
