Consórcio feijão-caupi e milho sob lâminas de irrigação e coberturas vegetais mortas

Abstract

The general objective of the research was to analyze the productivity of the cowpea and corn consortium, under irrigation depths and dead vegetation cover in the soil. The research was developed in the experimental area of the Agrometeorological station of the Federal University of Ceará, in Fortaleza, Ceará. For the conduction of the experiment, a delineation in subdivided plots was used, in a 5 x 4 factorial arrangement, referring to 5 irrigation depths (25%; 50%; 75%; 100% and 125% of the consortium Evapotranspiration - ETc) and 4 dead vegetable coverings of the soil (rice husk, carnauba bagana, mixed - rice husk + carnauba bagana and without mulch), with 4 repetitions, totaling 80 experimental units. For beans, the variables were evaluated: length of pods, number of grains per pod, number of pods per plant, mass of pods and productivity. For corn, the variables were analyzed: ear mass with straw, ear mass without straw, ear length, ear diameter, cob weight and productivity. The observed data were submitted to analysis of variance (Anova). The quantitative data, referring to the irrigation depths, when significant by the F test, were submitted to regression analysis, using the level of 1 or 5% (P <0.01 or 0.05). For qualitative data, referring to dead vegetation cover, averages tests were performed (Tukey, at the 5% level). When significant, for the interactions between quantitative and qualitative data, multiple regression graphs were performed. The highest productivity of cowpea was obtained with the use of rice husk cover, with an irrigation blade equivalent to 125% of the consortium's evapotranspiration (from ETc). The highest corn productivity occurred when the largest blade equivalent to 125% (of ETc) was used with the soil under mixed cover (rice husk + carnauba bagana).