INFLUENCE OF WATER LEVELS IN THE YIELD AND PHYSIOLOGICAL PARAMETERS OF RADISH CULTIVATION

Excess water in the soil is very damaging to crops, especially fast-cycle crops as radish, which is very susceptible to excess water in the soil. In view of this, an experiment was conducted with the objective of evaluating the yield of the radish crop under different phreatic levels. The experimental design was a randomized block with five treatments: constant phreatic levels at the depths to 5, 10, 20, 30 cm and a control treatment (without the presence of water table) and 6 replications, totaling 30 experimental units. For this, drainage tanks were used during two seasons crops (05/03/17 to 06/02/2017 and 06/20/17 to 07/20/2017), were analyzed yield variables: root diameter, fresh mass of root and aerial part, dry mass of root and aerial part. Gas exchanges were analyzed: liquid photosynthesis rate, stomatal conductance, transpiration and leaf temperature. The data submitted to the test F and later to the Tukey teste to 5% of probability. Most of the studied variables presented a reduction in their values as the water table approached the soil surface. The treatment with phreatic level of 20 cm of depth presented conditions favorable to the development of the culture.