Influência da Cobertura Plástica Sobre a Temperatura em Parreirais no Vale do Submédio São Francisco (Influence of the Plastic Cover on the Vineyard Temperature in the Submédium São Francisco Valley)
DOI:
https://doi.org/10.26848/rbgf.v4i1.232693Keywords:
Uva de mesa. Cultivo Protegido. Aquecimento. Parreiral.Abstract
O presente trabalho teve como objetivo avaliar a influência da cobertura plástica sobre a temperatura do ar em parreirais no Vale do Submédio São Francisco. A pesquisa foi conduzida em parreirais produtivos de uva de mesa variedade Festival em Petrolina, PE (09º 06’ 14’’ S; 40º 29’ 52” W; altitude 360 m), no período de 17/09/2010 a 10/10/2010, durante a fase de maturação e colheita da uva. Foram empregados três tratamentos, cada um, representado por 12 m de fileira descritos a seguir: tratamento 1 - sem cobertura plástica (SCob); tratamento 2 - com cobertura plástica posicionada a 50 cm acima do dossel (CP50); e tratamento 3 - com cobertura plástica posicionada a 100 cm acima do dossel (CP100). Medidas de temperatura do ar e velocidade do vento foram efetuadas a 20 cm acima e abaixo do dossel, esta última, na altura média dos cachos. Os resultados mostraram que o tratamento CP50 proporcionou aquecimento acentuado na camada do ar sobre o dossel do parreiral com a temperatura máxima atingindo 45,4 °C, valor 10,1 °C maior do que a temperatura máxima no tratamento SCob e 7,3 °C maior do que a temperatura máxima no tratamento CP100. Isso evidenciou que a altura da cobertura plástica sobre o dossel do parreiral influencia no seu microclima e deve ser levada em consideração quando do planejamento de sua utilização.
Palavras-chave: Uva de mesa, Cultivo Protegido, Aquecimento, Parreiral.
Influence of the Plastic Cover on the Vineyard Temperature in the Submédium São Francisco Valley
ABSTRACT
This study evaluated the influence of the plastic cover on the air temperature in vineyards in the region of the São Francisco Valley. The study was conducted in vineyards of table grape variety Festival in Petrolina, PE, Brazil (09º 06 '14";;;;;;;; S; 4 ° 29' 52";;;;;;;; W; elevation 360 m) in the period from Sep./17/2010 to Oct./10/2010. The following treatments were evaluated, each represented by 12 m of row: treatment 1 - no plastic cover (SCob); treatment 2 - plastic cover 50 cm above the canopy (CP50); and treatment 3 - plastic cover 100 cm above the canopy (CP100). Measurements of air temperature and wind speed were made at 20 cm above and below the canopy around the location of grapes bunches. The results showed that the plastic at the height of 50 cm provided a dramatic warming in the layer of air above the vineyard canopy with the maximum temperature reaching 45.4 °C which represents a value 10.1 °C greater than the maximum temperature without the canopy cover and 7.3 °C higher than the maximum temperature of the canopy of 100 cm. This evidence showed the influence of de height of the plastic cover on the canopy of the vineyard microclimate and it has to be considerade when planning their use.
Keywords: Grape table. Protected cultivation. Heating. Vineyard
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Copyright (c) 2011 Paulo César da Silva Lima, Mário de Miranda Vilas Boas Ramos Leitão, Pedro Vieira de Azevedo
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