Fisiologia em mudas de Talisia esculenta sob irrigações com água salina em substrato com hidrogel.

Abstract

Salinity is one of the factors that most interfere in the physiology, product and quality of seedlings. Requiring the association of measures that mitigate its effects. Thus, the objective was to evaluate irrigation frequencies, saline polymer and container volume in the physiology of Talisia esculenta. The experiment was carried out in a screened shelter, evaluating polymer doses (0,0; 0,2; 0,6; 1,0 and 1,2 g dm-3 ) and eletrical conductivities of irrigation water (0,3; 1,1; 2,7; 4,3 e; 5,0 dS m-1 ), arranged according to the Central Box Compoud and factorially combined with irrigation frequencies (daily and alternate) and two additional treatments to evaluate volume of the container. A randomized block design was used, with four replications and four containers per plot. Leaf indexes of chlorophyll, fluorescence and gas Exchange were analyzed. The decrease in the frequency of irrigation reduced the chlorophy index ‘b’, stomatal condutance, transpiration, CO2 assimilation, water use efficiency, carboxylation and increased the concentration of CO2 in the leaves. Overall, salinity reduced gas exchange. Reduction in the volume of the container, under daily frequency, decreased stomatal condutance, transpiration, CO2 assimilation, water use and carboxylation efficiencies. In the production of T. esculenta seedlings, the daily frequency of irrigation is recommended useing water with eletrical conductivity less than 0,7 dS m-1 , incorporation of 0.6 g dm-3 of polymer and containers with a capacity of 1,30 dm3 .