Articles
EVALUATION OF THE USE OF THE GRANIER SAP FLOW METHOD IN JAPANESE PEAR BY COMPARISON WITH TRANSPIRATION BY THE WEIGHING METHOD
Article number
846_11
Pages
121 – 126
Language
English
Abstract
Root zone restriction cultivation technique is a unique cultivation system in Japan.
A tree(s) is (are) cultured in a container, a pot, etc. to limit soil volume and control easily water and nutrient condition.
This system has ability to get high quality products but needs an irrigation system.
To irrigate exactly, estimating water use is a first step for this application.
To evaluate a technique that estimates simply the long-term water use in Japanese pear, results from the Granier sap flow method were compared with the transpiration using a balance.
The sap flow rate was calculated by multiplying the sap flux density given in Granier’s original equation by the sapwood area estimated using a dyeing method.
The hourly sap flow rate as measured by the Granier method was in good agreement with the hourly transpiration rate through a month, for the range of low fluxes considered: up to about 0.6 L h-1. Furthermore, the daily sap flow rate was in good agreement with the daily transpiration rate during the growing period.
These results suggest that the Granier method can be used directly to measure the hourly or daily transpiration rate in Japanese pear under low transpiration condition and estimate water use for irrigation scheduling purposes.
A tree(s) is (are) cultured in a container, a pot, etc. to limit soil volume and control easily water and nutrient condition.
This system has ability to get high quality products but needs an irrigation system.
To irrigate exactly, estimating water use is a first step for this application.
To evaluate a technique that estimates simply the long-term water use in Japanese pear, results from the Granier sap flow method were compared with the transpiration using a balance.
The sap flow rate was calculated by multiplying the sap flux density given in Granier’s original equation by the sapwood area estimated using a dyeing method.
The hourly sap flow rate as measured by the Granier method was in good agreement with the hourly transpiration rate through a month, for the range of low fluxes considered: up to about 0.6 L h-1. Furthermore, the daily sap flow rate was in good agreement with the daily transpiration rate during the growing period.
These results suggest that the Granier method can be used directly to measure the hourly or daily transpiration rate in Japanese pear under low transpiration condition and estimate water use for irrigation scheduling purposes.
Publication
Authors
H. Sugiura, D. Sakamoto, T. Sugiura, T. Asakura, T. Moriguchi
Keywords
dyeing method, irrigation, root zone restriction cultivation, sapwood
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