Operação e manejo da irrigação no perímetro de Sumé-PB.

Abstract

The purpose of this work was to characterize the soils of the Sume Irrigation Station with respect to the ir physical and hydric properties; study diferent ways of irrigation programming for corn, beans, tomato and cotton and offer alternatives for the best irrigation water use and management. Four approach for irrigation programming were studied: irrigation for maximum yields, irrigation to obtain 80% of the maximum yields, irrigation when 50% of the soil available water for plants is used and irrigation with a fixed interval of 4 days. The results show that the studied soils are aluviais, sandy loam, loam, and clay loam. High bulk density (1,64 to 3 1,76 g/cm) and medium and uniform porosity. With respect to the irrigation programming for the area of Sume, it is observed that the irrigation with a fixed interval is the most recpmended because, besides obtaining high levels of productivity, it is adequaded to the administrative conditions, technical level of the farmers and dispense economical expenses for the acquisition of humidity monitoring equipments.