Otimização do uso da água em abacaxizeiro cv. brs imperial com redução da evaporação e percolação de água

Abstract

In order to adopt strategies aimed at the efficient use of water, it is important to have root knowledge of agricultural crops. In this sense, the objective of this work is to determine the effect of using plastic mulching as a strategy to control evaporation and percolation on root distribution in soil cultivated with pineapple cv. BRS Imperial. The experiment was carried out in the city of Cruz das Almas – BA, in the dependencies of Embrapa Cassava e Fruticultura – EMBRAPA. Pineapple cv. BRS Imperial, using baby seedlings. The irrigation system used was drip irrigation. The experimental design was planned in randomized blocks in a 5 x 4 x 4 split plot scheme, with five different days after planting in the plot (90, 180, 270, 360 and 450 DAP), in the subplot 4 treatments and four replications. The treatments involved soil with (CC) and without (SC) cover and percolation impediment (with-CI or without-SI). A plastic film (biodegradable agricultural mulching) served both to cover the ground and to prevent percolation. The variables analyzed in this study were root dry weight, relative root growth rate (TCR), absolute root growth rate (TCA) and distribution of length and root length density in depths and distances. The treatments with soil cover (CC – CI), (CC – SI) provided a greater accumulation of dry mass of roots compared to treatments without soil cover SC-CI and SC – SI. Pineapple has a greater predominance of the root system close to the soil surface, as a higher concentration of roots in the stalk.