Biometria e produtividade da cana-de-açúcar sob lâminas de irrigação aplicadas por gotejamento subsuperficial pulsado

Abstract

In this study, the objective was to evaluate the morphology and productivity in sugarcane cultivation irrigated by continuous and pulsed subsurface drip, under different replacement levels of crop evapotranspiration. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC) with RB041443 variety in first season (plant cane). The design used was randomized blocks, with 10 treatments arranged in a 2 x 5 factorial arrangement, with two ways of irrigation application (pulsed and continuous) and five replacement levels of crop evapotranspiration (40, 60, 80, 100 and 120% of ETc), with four blocks, totaling 40 experimental plots. The treatments were applied in the months of greatest water deficit in the region (August, September, October), using the subsurface drip irrigation system. At 237 DAP the biometric measurements were initiated: stem height (AC) and diameter (DC), number of green and dry leaves, leaf length and width +3. In addition, leaf area (AF), leaf area index (IAF) and productivity were estimated. The results were submitted to analysis of variance by the F test at the 5% probability level. The ways of application and replacement depth had an effect alone only for productivity. The continuous distribution blades, being the biggest pulsators of the grouping operation were obtained under 80% of the pulsation, as far as for. The pulsed drip irrigation for better results in sugarcane productivity methods compared to continuous.