Estudo Comparativo Da Evapotranspiração De Referência Entre Localidades No Estado De São Paulo E Na Província De Habana

Abstract

FAO proposed the reference evapotranspiration to compare evapotranspiration in different areas, because most equations employed in estimating evapotranspiration are empirical and limited to be used in local and climates similar to those in which they were determined. The objective of this study was to analyze the difference in calculated values of ETo for Botucatu and Piracicaba (Brazil) and Güira Melena (Cuba), based on 30-year data. Seasonal differences between years and locations were assessed and subsequently the influence of local climates on these ETo values differences. Climatic elements maximum (Tmax) and minimum temperature (Tmin), relative humidity (RH), wind speed at 2 m height (U2) and solar radiation (n) were obtained from conventional meteorological stations. Evapotranspiration values in Cuba were higher during summer months in the Northern Hemisphere. The highest evapotranspiration values in Botucatu and Piracicaba occurred in summer months in the Southern Hemisphere. Correlation exists between the three locations with the same distance between them. It was concluded from the methodology used that the three localities have different evapotranspiration values and despite being in different hemispheres the evapotranspiration among Piracicaba and Güira Melena are closer than the one verified between Botucatu and Piracicaba.

Production and water-use efficiency of Megathyrsus maximus cv. Mombaça “Guinea grass” under nitrogen and boron doses

“…The regional climate is Cwa, i.e., a humid subtropical climate, according to the Köppen classification, with hot summers and rain concentration in the summer (Pereira et al, 2016). The accumulated rainfall during the experimental period was 1,133 mm and water supplementation by irrigation reached 436.9 mm.…”

Comparison of water consumption estimates for tropical and winter forages by FDR probes and weighing lysimeters

“…According to Köppen's classification, regional climate is defined as Cwa, i.e. a humid subtropical climate (PEREIRA et al, 2016). During the experimental period, the minimum temperature was 3.0 °C ( Figure 1).…”

Thermal time in nitrogen and boron application on irrigated Mombaça grass “Guinea grass”

“…It presents the particle-size characteristic of 32.5% sand, 18.9% silt, and 48.6% clay. According to Köppen classification, the region climatic is Cwa -subtropical or tropical of altitude, hot summer, low frequency of frost, and rain concentration during the summer period [13].…”