Evapotranspiration and maximum transpiration in a high density coffee plantation. / Evapotranspiração e transpiração máxima em cafezal adensado.

AUTOR(ES)

Fábio Ricardo Marin

DATA DE PUBLICAÇÃO

2003

RESUMO

Coffee arabica plants are extensively cultivated in tropical regions and it is a crop of great economic importance for Brazil. Currently, it is cultivated in areas with water deficits for which the irrigation is necessary to increase yields and drink quality. To increase irrigation efficiency one needs to know the water consumption of coffee plantation, information that is not easyly get specially in high density coffee plantations. The present study was carried out in order to determine the evapotranspiration of a coffee plantation Novo Mundo Apuatã and its partition in transpiration of coffee plants and interrow evapotranspiration. The coffee plantarion had a high density (2500 plants/ha) and drip irrigation. Evapotranspiration of coffee plantation was determined by Bowen ratio method, while transpiration was obtained by Penman-Monteith model, where this last one was compared with sap flow measures by heat balance method in stem. The comparison showed reasonable agreement between daily transpiration by model and sap flow data, with major disagreement in two of four evaluated plants wich was probably due to technique of determination of radiant energy absorbed by coffee plants. Moreover, the relation between the amount of absorbed radiant energy and leaf area of plants seems to contribute to discrepances between sap flow and estimated transpiration. The leaf resistance also introduced some error in estimated transpiration by Penman-Monteith model. It was verified that coffee plants transpiration represented 90% of total evapotranspiration of coffee plantation in the period when interrows had no living vegetation. In the subsequent period, when vegetation was developed, transpiration decrease to 69% of total evapotranspiration. Dividing evapotranspiration in its two components, it was determined that basal crop coefficient and evaporative coefficient were equal to 0,8 and 0,2, respectively, with a global crop coefficient next to unit.

ASSUNTO(S)

coeficiente de cultura coffee plant big leaf model modelo de penman-monteith plant transpiration. evapotranspiração transpiração vegetal. café crop coefficient evapotranspiration

Documentos Relacionados

• Balanço de energia e evapotranspiração de cafezal adensado em crescimento sob irrigação localizada.
• Evapotranspiração de cafezal semi-adensado irrigado por gotejamento e sua relação com a evapotranspiração de referência
• Relações entre transpiração máxima, evapotranspiração de referência e área foliar em quatro variedades de mangueira
• MODELS OF THE MAXIMUM EVAPOTRANSPIRATION IN PLASTIC GREENHOUSE FOR SWEET PEPPER AND TOMATO DURING THE SPRING
• Estimating of transpiration in crop coffee using heat dissipation sensors.