Desempenho agronômico e soma térmica da couve-flor "Sharon" sob diferentes telas de sombreamento

Abstract

Objective determine the phenology of leaf growth, production and productivity of the cauliflower ' Sharon ' in the North of the Brazilian State of Mato Grosso, to both the production sector of the University campus of Sinop-UFMT, analyzed the foliar emissions, the development of inflorescences and the thermal sum cauliflower plants CV. Sharon under Shading screens in randomized blocks design with 4 replications of 20 plants each. The evaluated treatments were poliefinas black shading screens, with reductions in the incidence of 80% direct sun, 65%, 50%, 35% and 0%, and a treatment under termorrefletora Aluminet aluminized fabric with 50% reduction of solar incidence. None of the plants under 80% screen presented floral differentiation is therefore not produced; the plants under 35% presented the lowest average production cycle (90 days) and productivity of 24.15 t. ha-1; There was no difference in the duration of the cycle between the screens of 50% and full sun, with 110 and 107 days. The higher productivity of inflorescences (31.22 t. ha-1, was found in the full sun. The largest cycles have been observed on the screens of 65% (126 days) and Aluminet (120 days), with respective capacities of 18.2 t. ha-1 and 18.7 t. ha-1; the greater need for adequate thermal plants to flourish under Aluminet (2318.18 GDA), and the smallest thermal sum in plants under 35% mesh (1844.54 GDA). It is concluded that both the planting to full sun as the shading mesh of 35% are great techniques to obtain the maximum potential of the cultivar of cauliflower Sharon with short cycle.