Uso de esgoto doméstico na irrigação do milheto cultivado com feijão lablab no semiárido brasileiro.

Abstract

In Brazil, planted area with millet (Pennisetum glaucum) is estimated to be over two million hectares. It is a drought resistant crop, but it also responds well to irrigation and consortium practices with Fabaceae species. Thus, the objective of this work was to evaluate the effect of different irrigation slides with the residual water in millet culture in a consortium with lablab bean (Dolichos lablab), under field conditions, on brazilian semiarid. The experiment was conducted in the municipality of Frei Martinho-PB. Two experimental designs were adopted: i) for the plant, the randomized block design was used, with plots sub-divided into space (5x2x2 scheme), with five slides (40, 60, 80, 100 and 120% of available water), In the millet consortium with the lablab bean (with and without) and with two cultivation cycles (1st and 2nd cycles) in the sub-plot, with 4 replicates; ii) for the soil related characteristics, similar to the first one, with an increase of sampling time in the subplot (3 field collections). Irrigation with residual water influenced the production of millet biomass. The highest growth, productivity and photosynthetic activity of millet were observed in the first crop cycle. The consortium with lablab did not affect the growth and production of millet. The maximum yields of millet biomass (55,087 kg GM / ha and 11,117 kg DM / ha) were corrected in 120% of the available water. The greater efficiency of the use of water in the smallest blade of applied water. In the soil, phosphorus and potassium content decreased. However the sodium and the pH increased. There was no change in the soil organic carbon content.