Supplementary irrigation on Creole beans

Abstract

The experiment was carried out during the months of July to October 2019 in the agricultural experimental area of ​​the Federal University of Acre, campus of Rio Branco. Three varieties of “Creole” cowpea beans (Baiano, Caupi-preto and Costela-de-vaca) were used, drip irrigated. The experimental design was in randomized blocks, in a split plot scheme with 4 treatments and 5 repetitions. The treatments corresponded to the beginning of irrigation when the soil water pressure heads reached (T1: 15 kPa; T2: 25 kPa; T3: 40 kPa and T4: 60 kPa). The data were submitted to the F test for analysis of variance and in the verification of significant interaction between the sources of variation, the Tukey test was performed at 5% significance for comparison between means, the effect of water stress on the soil on productivity of bean varieties was demonstrated by regression equations. To obtain the highest productivity, irrigation should be started when the soil water pressure heads reaches 15 kPa (Rib-of-cow), 33 kPa (Caupi-preto) and 38 kPa (Baiano), considering the efficiency of water use soil water pressure heads are recommended for the beginning of irrigation of 15 kPa (Costa-de-vaca) 25 kPa (Caupi-preto) and 45 kPa (Baiano).