Evapotranspiração máxima do pimentão cultivado em estufa plástica em função de variáveis fenométricas e meteorológicas

Pivetta, Carina Rejane; Heldwein, Arno Bernardo; Maldaner, Ivan Carlos; Radons, Sidinei Zwick; Tazzo, Ivonete Fátima; Lucas, Dionéia Daiane Pitol

doi:10.1590/s1415-43662010000700013

Cited by 16 publications

(14 citation statements)

References 13 publications

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“…This difference is related to microclimate changes caused by the use of a protected environment, as reported by DALMAGO et al (2006), REIS et al (2009) andGUISELINI et al (2010), causing water consumption of crops in protected environments to be lower than in field conditions. PIVETTA et al (2010) attribute this change mainly to the partial opacity of the cover, solar radiation and the wind reduction, which are major factors of the atmospheric evaporative demand.…”

Section: Resultsmentioning

confidence: 99%

Climate variations in greenhouse cultivated with gerbera and relationship with external conditions

Andrade

Damasceno²,

Dias

et al. 2011

Eng. Agríc.

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Black meshes used in greenhouses provide shade to plants, affecting photosynthesis and presenting certain properties that change the microclimatic conditions in these environments. The objective of this study was to evaluate the variation in climate elements in greenhouse cultivated with gerbera (Gerbera jamesonii, Vr. Rambo) in relation to external conditions and the reference evapotranspiration (ETo) at Teresina, State of Piauí, Brazil. The measurements were obtained from July to October 2007 by an automatic data acquisition system installed inside and outside the greenhouse. The global solar radiation, evapotranspiration, precipitation, temperature, relative humidity, and wind speed were estimated. The results showed that major effect of the shading occurred on the mean air temperature during the 120 days, making it higher than the external environment. Inside the greenhouse, mean values of relative air humidity, reference evapotranspiração, global solar radiation and wind speed were lower compared to those outside the greenhouse.KEYWORDS: meteorology, meteorological elements, floriculture, Gerbera jamesonii. VARIAÇÕES METEOROLÓGICAS EM AMBIENTE PROTEGIDO CULTIVADO COM GÉRBERAS E SUAS RELAÇÕES COM AS CONDIÇÕES EXTERNAS RESUMO:Os ambientes protegidos cobertos com malha negra fornecem sombreamento às plantas, têm forte influência no processo da fotossíntese e possuem propriedades particulares que interferem nas condições micrometeorológicas desses ambientes. Objetivou-se, neste trabalho, avaliar os elementos meteorológicos no interior do ambiente protegido cultivado com gérbera (Gerbera jamesonii, Vr. Rambo) em relação ao ambiente externo e na evapotranspiração de referência (ETo), a qual foi correlacionada às variáveis ambientais em Teresina-PI. No período de julho a outubro de 2007, os elementos meteorológicos foram obtidos por um sistema de aquisição de dados automático instalado no interior do ambiente protegido e externamente. Estimaram-se a radiação solar global, temperatura, umidade relativa do ar, evapotranspiração de referência, precipitação e velocidade do ar. Os resultados mostraram que o maior efeito da cobertura ocorreu sobre a temperatura média do ar durante os 120 dias, tornando-as acima das verificadas no ambiente exterior. Foram observados no ambiente protegido, valores médios de umidade relativa do ar, evapotranspiração de referência, radiação solar global e velocidade do vento, inferiores aos obtidos em condição de campo.

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Section: Resultsmentioning

confidence: 99%

Climate variations in greenhouse cultivated with gerbera and relationship with external conditions

Andrade

Damasceno²,

Dias

et al. 2011

Eng. Agríc.

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“…Studies have been reporting the dependence of water demand in relation to the incidence of solar radiation in the environment (Dalmago et al, 2006;Pivetta et al, 2010), since it is responsible for environmental heating processes, biomass accumulation by photosynthesis, control of stomatal opening among others. Photosynthesis is strongly related to the availability of photosynthetically active radiation, and a non-linear increase of photosynthesis in relation to higher radiation availability is observed (Mercado et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

Physiological response of cidró to different water replacement levels in two seasons of the year

et al. 2017

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We aimed to determine the response of cidró (Aloysia triphylla) submitted to different water replacement levels in summer and winter, in order to understand and relate the plant physiological performance under adverse weather conditions. The research was developed in a protected environment, in the city of Frederico Westphalen, Rio Grande do Sul State, Brazil. The experimental design was completely randomized, arranged in a 2x4x2 factorial scheme, two seasons of the year (summer and winter), four water availability (50, 75, 100, 125% of ETo) and two faces of leaf (abaxial and adaxial), with four replications. There were evaluated stomatal vapor diffusion resistance (s/cm), transpiration (µg/cm2/s) and leaf temperature (°C), on both faces of the leaf from 10 a.m. to 11 a.m., 1 p.m. to 2 p.m. and 4 p.m. to 5 p.m., 45 days after the beginning of the season. We concluded that the physiological response of cidró plants was influenced by water replacement levels, in a different way according to the seasons of the year. The summer season was responsible for the highest values of incident photosynthetically active radiation, leaf temperature, transpiration and stomatal vapor diffusion resistance. The reduction in water availability promoted the increase in values for stomatal resistance to vapor flow, reducing leaf transpiration rate. The incident photosynthetically active radiation, leaf temperature and transpiration showed highest values on the abaxial face of the studied species.

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“…Para a abóbora italiana cultivada no outono também em estufa plástica, os melhores modelos incluem a evapotranspiração de referência e o saldo de radiação medido no ambiente externo (Heldwein et al, 2004). Pivetta et al (2010) verificaram a existência de alta relação entre a evapotranspiração máxima do pimentão e o déficit de saturação do ar e geraram modelos utilizando o Evaporímetro de Piche, além de variáveis meteorológicas obtidas no interior da estufa plástica, porém para a cultura do pimentão cultivado na primavera na região de Santa Maria, RS, não existem modelos gerados e testados utilizando-se somente variáveis medidas no exterior da estufa plástica. A obtenção dessas variáveis nem sempre é possível, devido ao custo dos equipamentos e à falta de treinamento dos produtores.…”

Section: Introductionunclassified

Evapotranspiração do pimentão em estufa plástica estimada com dados meteorológicos externos, na primavera

Tazzo

Heldwein

Maldaner

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M ONeste trabalho o objetivo foi gerar e testar modelos matemáticos para a estimativa da evapotranspiração máxima para a cultura do pimentão, com variáveis meteorológicas medidas no exterior de estufa, na primavera, em Santa Maria, RS. Dois experimentos foram conduzidos, um no ano de 2005 e outro em 2006, visando à geração e aos testes dos modelos, respectivamente. A evapotranspiração foi medida em três lisímetros de drenagem e um lisímetro de balança. Foram feitas medições semanais da altura de plantas, do número de folhas e da área foliar. Os valores diários das variáveis meteorológicas externas foram obtidos na Estação Meteorológica Principal de Santa Maria, concluindo-se ser possível estimar, com precisão aceitável e em nível diário, a evapotranspiração máxima da cultura do pimentão em estufa, na primavera, com modelos matemáticos que utilizam variáveis medidas no exterior da estufa. O déficit de saturação do ar médio diário, a radiação solar global, o saldo de radiação e a evapotranspiração de referência medidos no exterior da estufa, foram as variáveis que apresentaram os melhores resultados na estimativa da evapotranspiração máxima da cultura do pimentão na primavera em estufa plástica. Palavras-chave: Capsicum annuum L., modelos, radiaçãoEvapotranspiration cultivated in greenhouse of sweet pepper estimated with outside meteorology data in spring season A B ST R A C T The objective of this work was to develop, test and validate mathematical models for maximum evapotranspiration estimations of a sweet pepper crop using meteorological variables measured outside the greenhouse, in Santa Maria, RS. Two experiments were conducted during spring of 2005 and 2006, for data collection, respectively for development and testing of models. The maximum evapotranspiration was measured using three drainage and one weighting lysimeter. Plant height, number of leaves and leaf area were weekly determined. The daily values of meteorological variables were obtained at the main Meteorological Station of Santa Maria. It is possible to estimate the maximum evapotranspiration of sweet pepper crop grown inside greenhouses during the spring with mathematical models that use various external measurements. Better estimations of maximum evapotranspiration of sweet pepper crop grown inside plastic greenhouse during the spring were obtained using meteorological variables, mean vapor pressure deficit, solar radiation, net radiation and reference evapotranspiration, measured outside the greenhouse. It was concluded that it is possible to estimate, with acceptable accuracy at daily level, the maximum crop evapotranspiration of sweet pepper grown in greenhouse in spring, using complex mathematical models that use meteorological variables measured outside the greenhouse.

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Evapotranspiração máxima do pimentão cultivado em estufa plástica em função de variáveis fenométricas e meteorológicas

Cited by 16 publications

References 13 publications

Climate variations in greenhouse cultivated with gerbera and relationship with external conditions

Climate variations in greenhouse cultivated with gerbera and relationship with external conditions

Physiological response of cidró to different water replacement levels in two seasons of the year

Evapotranspiração do pimentão em estufa plástica estimada com dados meteorológicos externos, na primavera

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