Evapotranspiração máxima da cana de açúcar estimada pelo algoritimo SAFER
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2017-03-15
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Universidade Federal de Goiás
Resumo
Sugarcane is the main irrigated crop in Brazil (more than 25% of all irrigated areas in the country),
requiring cumulative rainfall during its 1,000 mm year-1 cycle. Thus, evapotranspiration is a
fundamental information for planning, hydro-hydraulic design, water management along the cycle
and management of water resources for culture. Irrigation planning based on empirical values of
the crop coefficient (Kc) can increase production costs, reduce product quality and yield. The use
of remote sensing associated with orbital images and algorithms, aid in the estimation of
evapotranspiration when combined with physical models. The SAFER is a simplified algorithm
when compared to the others that are also used to determine the current evapotranspiration of the
crop, since it is based on the Penman-Monteith equation to obtain the evapotranspiration, being this
factor the main one to choose this algorithm for its use . In this way, the objective of this study was
to determine the evapotranspiration of the sugarcane crop (first cycle), as well as the respective
crop coefficients (Kc) for the region of the São Patrício Valley in Goiás, by energy balance (Using
the remote sensing allied to the SAFER algorithm) and water balance (monitoring the atmosphere
and water in the soil). Thus, this study had the objective of estimating crop evapotranspiration
(ETa) of the variety IAC 91-1099 of sugarcane by the SAFER (Simple Algorithm for
Evapotranspiration Retrieving) energy balance model using images from Landsat 8 OLI / TIRS,
and comparison with soil water balance method (ETBHS) using soil moisture sensors (EC-5) and
reference evapotranspiration (ETo Penman-Monteith). The study was carried out at Esplanada
Farm, in Goianésia / Goiás, from June / 2015 to July / 2016, in medium texture soil with
conventional tillage and transplanting of seedlings in irrigated areas of 100 ha (central pivot). In
addition, plant height, stem diameter, leaf temperature, yield and juice quality were monitored. The
water status of the soil and the plant revealed that there was no water deficit during the cycle of
398 days. The results also showed that for the estimation of sugarcane evapotranspiration the
SAFER method overestimated the ETBHS in 22.89%. Despite of the ETa estimated by the SAFER
method to present a significant correlation with the water balance method (R2 = 0.7778), other
studies must be conducted before being recommended for estimation of sugarcane ETa in the
region.
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Citação
MUSSI, R. F. Evapotranspiração máxima da cana de açúcar estimada pelo algoritmo SAFER. 2017. 76 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2017.