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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Net radiation and soil heat flux in natural and protected environments cropped with cucumber

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Author(s):
EMERSON GALVANI [1] ; JOÃO FRANCISCO ESCOBEDO [2] ; ANDRÉ BELMONT PEREIRA [3]
Total Authors: 3
Affiliation:
[1] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas. Departamento de Recursos Naturais
[2] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas. Departamento de Recursos Naturais
[3] Universidade Estadual de Ponta Grossa. Departamento de Solos e Engenharia Agrícola
Total Affiliations: 3
Document type: Journal article
Source: Bragantia; v. 60, n. 2, p. 139-147, 2001-00-00.
Abstract

Net radiation, global solar radiation and heat flux from/to the soil both inside and outside greenhouses with polyethylene cover throughout the fall-winter and spring-summer seasons have been assessed at the research station of the Universidade Estadual Paulista, Campus of Botucatu, State of São Paulo, Brazil. Throughout the cycles of the experiment, both environments scrutinized in the current study were cultivated with cucumber crop - Aoday, Hokuroo - a variety of undetermined growth habit. The results indicated that the greenhouse with polyethylene cover tended to decrease the intensity of solar radiation incidence per unity of area throughout the diurnal period, as well as losses from emission during the nighttime. The transmissivity of polyethylene was altered as a function of the day of the year and exposition time of the material, changing from 70.8% at the winter to 74.9% at the summer seasons. The heat flux from/to the soil during the spring-summer cycle was dependent of the leaf area of the crop. (AU)