Evapotranspiration and crop coefficients of melon plants measured by lysimeter and estimated according to FAO 56 methodology

Engenharia Agrícola

Talyana K. De Melo²  José F. De Medeiros¹  José E. Sobrinho¹  Vladimir B. Figueiredo¹  Paulo S. De Souza¹ 

[1] ,Instituto de Defesa e Inspeção Agropecuária do Rio Grande do NorteAssú RN

关键词: Cucumis melo L.;    irrigation management;    climatic data;    Cucumis melo L.;    manejo da irrigação;    dados climáticos;   

DOI  :  10.1590/S0100-69162013000500005

来源: SciELO

【 摘 要 】

Aiming at contributing to an adequate management of water resources, this study aimed to analyze and compare evapotranspiration (ETc) and crop coefficients (Kc) of melon plants measured by a lysimeter and estimated according to the FAO 56 methodology, in the city of Mossoró, state of Rio Grande do Norte (RN), Brazil. In order to measure ETc, weighing lysimeters with an area of 2.25m² were used, with two repetitions. The Penman-Monteith equation parameterized by FAO was used to estimate the reference evapotranspiration, and crop coefficients were those recommended in FAO-56 Bulletin adjusted to local climatic conditions. The required climatic data and lysimeter measurements were collected by an automatic weather station installed at the site. The results were compared by means of statistical indicators: of precision (r), of accuracy (d), and performance (c), in daily and weekly intervals. The data estimated by the FAO 56 methodology were adjusted optimally to the values measured by the lysimeters in accordance with index "c" in the two time scales assessed, indicating the potential of the method proposed by FAO to irrigation management in the climatic conditions of Agripole Assú-Mossoró.

【 授权许可】

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