Water management of irrigation for alfalfa in a Red-Yellow Latosol (Hapludox)

Abstract

This work was carried out to evaluate a practical method for the irrigation water management for alfalfa (Medicago sativa) cultivation. The study was conducted in a Red-Yellow Latosol (Hapludox) soil, and the variables studied were: "A" tank evaporation (CAE), rainfall (R) and water storage capacity of the soil (WSC). Treatments consisted of three hydric conditions: H₁: no irrigation; H₂: supplement irrigation when CAE - PRP ³ 30 mm from full vegetative stage on plant; H₃: supplement irrigation when CAE - PRP ³ 20 mm during entire plant cycle. It was found that the method for the Red-Yellow Latosol using CAE - R = 20 to 30 mm is consistent with the WSC, and that efficiency of utilization usage of water applied can be increased, without decreasing the forage yield.