NORMAL AND SEQUENTIAL CLIMATOLOGICAL WATER BALANCE IN THE MUNICIPALITY OF PEREIRA BARRETO-SP AS AID FOR THE PLANNING OF IRRIGATED AGRICULTURE

Abstract

This work aimed to generate a normal and sequential climatological water balance (BHC) for the municipality of Pereira Barreto, SP to identify the periods of the year with surplus and deficit of water in the soil. Two BHCs were carried out for the municipality determined by the method of Thorthwaite and Mather (1955), based on data from the automatic agro-meteorological stations Bonança and Santa Adélia, belonging to the Northwest Agro-meteorological Network of the Northwest, operated by Unesp of Ilha Solteira. The average annual precipitation is 1214 mm and the evapotranspiration is 1340 mm for the Bonança Station, while for the Santa Adélia Station, the average annual precipitation is 1204 mm and evapotranspiration is 1574 mm. With the available Water Storage (CAD) of 40 mm, the BHCs found seven months of water deficit in the soil, between March and October in the Bonança Station, located on the banks of the Tietê River and from April to November in the Santa Adélia Station, located in the northwest portion of the municipality. Excess water in the soil in the Bonança Station occurred between the months of November and February and in the Santa Adélia Station, between January and March. BHC showed a high risk of crop failure with annual crops in the municipality without the use of irrigation.