Maximum evapotranspiration of sweet pepper grown in plastic greenhouse based upon meteorological and fenometrical variables

Revista Brasileira de Engenharia Agrícola e Ambiental

Pivetta, Carina R.¹  Heldwein, Arno B.¹  Radons, Sidinei Z.¹  Maldaner, Ivan C.¹  Lucas, Dionéia D.¹  Tazzo, Ivonete F.¹ 

[1] UFSM, Santa Maria

关键词: Capsicum annuum;    greenhouse;    piche    INTRODUÇÃO O pimentão (Capsicum annuum) é uma das cinco culturas com maior área em cultivo protegido;    tanto no Brasil como em diversos países devido à grande produtividade e qualidade dos frutos nessas condições (Lorentz et al;   

DOI  :  10.1590/S1415-43662010000700013

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objective of this study was to estimate maximum evapotranspiration (ETm) of sweet pepper inside a plastic greenhouse as a function of evaporation measured with "Piche" evaporimeter (Epi) exposed to solar radiation, with and without easily measured meteorological and phenologic variables. The experiment was carried out inside a 240 m2 plastic greenhouse. Daily ETm (measured with drainage lysimeters), Epi, air temperature, vapor pressure deficit (Di), leaf area index (LAI), plant height (PH), and leaf number (LN) were measured. Models were fitted to estimate ETm using data collected on even days of the experimental period, selecting only models with parameters significant at 5% by t test and coefficient of determination (R2) > 0.80. The best models for estimating ETm were obtained with Epi values, associated with a plant growth parameter, such as LAI, LN and PH. It was possible to estimate ETm of sweet pepper crop with acceptable accuracy (R2 between 0.81 and 0.91) to perform irrigation inside plastic greenhouse using models that take into account Epi and at least one plant growth parameter, however models with PH should be preferred. Including Di measured at 9 h in the models with Epi and PH or NL or LAI improved ETm estimates.

【 授权许可】

CC BY-NC