Estresse salino na cultura do rabanete cultivado em substratos

Abstract

Radish is a crop of fast vegetative growth and short cycle, widely accepted worldwide. In Brazil, its production and consumption are highlighted in the South, Southeast and Northeast regions, generating employment and income for family farming. Salinity is one of the main environmental factors that limit agricultural growth and productivity. The objective was to evaluate the growth of the radish crop grown on substrates and salinity levels of irrigation water. The treatments were obtained by combining three forms of substrates (0-20 cm layer soil; filter cake + soil and earthworm humus + soil) mixed in a 3: 1 ratio and five electrical conductivities of irrigation water (0,5; 1,5; 2,5; 3,5; 4,5 dS m-1). The experimental design used was completely randomized in a factorial scheme, in a 3 x 5 factorial scheme. Combined, the factors resulted in 15 treatments with four replications and one plant per plot, totaling 60 experimental units. Radish plants were evaluated for leaf number, plant height, leaf area, relative chlorophyll index, root mass and dry mass of the aerial part. Increasing salinity levels of irrigation water, results in a reduction in the number of leaves, plant height, leaf area, relative chlorophyll index, root mass and dry mass of the aerial part of radish plants cv. Crimson Gigant, however, the substrates with the addition of earthworm humus attenuated the harmful effects of salinity, being a viable alternative for the cultivation of radish plants under salinity conditions.