Affiliation:
1. Experimental Field of Gorutuba Minas Gerais Agricultural Research Agency/EPAMIG Nova Porteirinha Brazil
2. Biosystems Engineering Department University of São Paulo/USP‐ESALQ Piracicaba Brazil
3. Federal Institute of the North of Minas Gerais/IFNMG Januária Brazil
4. Dean of Research, Postgraduate and Extension University of Uberaba/UNIUBE Uberaba Brazil
Abstract
AbstractThe irrigated perimeter of Jaíba‐MG is located in a semi‐arid region of Brazil, which makes irrigation practices necessary in order to guarantee agricultural production. This need occurs in the context of limited water resources and, therefore, it is necessary to study ways to optimize water use efficiency (WUE). For this, it is necessary to obtain local and precise estimates of the crop coefficient (Kc) and the reference evapotranspiration (ET0). The objective of this study was to evaluate the water requirements and WUE of banana, lemon and mango crops in the irrigated perimeter region of Jaíba using satellite images and meteorological data. Landsat 8 satellite images from 2020 and 2021 were used to estimate the local Kc of these crops. Three methodologies for estimating local Kc were adopted: METRIC, NDVI and NDVI 2. The Kc NDVI method stood out when compared with the standard method (FAO Bulletin 56), with RMSEs of 0.11, 0.16 and 0.20 for banana, lemon and mango, respectively, showing the potential of this methodology. The overall average WUE values for banana, lemon and mango crops were 2.19, 1.58 and 1.58 kg m−3, respectively. The results could allow important advances in water management for fruit crops under semi‐arid conditions.
Funder
Universidade de São Paulo
Subject
Soil Science,Agronomy and Crop Science