Evapotranspiration and crop coefficient of drip irrigated watermelon in Piaui coastline, Brazil

Engenharia Agrícola

Edson A. Bastos²  Cláudio R. Silva¹  Braz H. N. Rodrigues¹  Aderson S. Andrade Jr.²  Lívia M. M. Ibiapina¹ 

[1] ,Embrapa Meio-NorteTeresina PI

关键词: Citrullus lanatus;    lysimeter;    water consume;    Citrullus lanatus;    lisímetro;    consumo hídrico;   

DOI  :  10.1590/S0100-69162012000300017

来源: SciELO

【 摘 要 】

The knowledge of the evapotranspiration (ETc) and crop coefficient (Kc) is fundamental to plan and to manage the irrigation of any crop. The aim of this study was to determine the daily and hourly evapotranspiration of drip irrigated watermelon (Citrullus Lanatus, var. Crimson Sweet) and crop coefficient (Kc) in each crop development phase. The experiment was carried out in an experimental area of 1.27 ha of Embrapa Mid-North, localized in Parnaíba (02°54'S, 41°47'W and 46 m above of sea), State of Piauí, Brazil, from September to November, 2006. Electronic weighing lysimeters of 1.5 m x 1.5 m wide and long and 1.0 m deep were used to obtain the evapotranspiration. The plants were drip irrigated with a lateral row per plant row and drippers spaced 0.5 m from each other. The reference evapotranspiration (ETo) was estimated using the Penman-Monteith equation from the climatic data obtained by electronic sensors. The total evapotranspiration during the watermelon crop cycle cultivated in the state of Piauí was 233.87 mm, with mean values of 3.7 mm day-1, minimum of 1.18 and maximum of 8.14 mm day-1. The Kc of the drip irrigated watermelon was 0.18 in the initial stage of crop growth; 0.18 to 1.3, in crop development stage; 1.3 in the intermediate stage and 0.43 in the final stage.

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