Articles
APPLICATION OF SAP FLOW MEASUREMENT IN REAL-TIME SOIL MOISTURE MANAGEMENT AND EXAMINATION OF SUPPLEMENTAL IRRIGATION USING AUTOMATIC DRIP SYSTEM UNDER HIGH ATMOSPHERIC DEMAND CONDITIONS
Article number
951_3
Pages
39 – 45
Language
English
Abstract
An automatic drip irrigation system based on sap flow rate measured by the heat pulse method was developed and examined for sweet pepper cultivation.
When the accumulated sap flow rates reached a certain point, irrigation was executed at an intensity of 40 ml min-1. In this study, 3 irrigation plots, (1 L, 3 L, and 4.5 L), were examined for sweet pepper cultivation and compared with a general automatic irrigation system based on soil moisture monitoring, determined by a soil moisture sensor.
Automatic drip irrigation systems based on soil moisture measurement have a tendency to decrease crop transpiration under high atmospheric demand conditions.
Two approaches to avoid this decrease were investigated; one approach was based on the location of drip points and the other approach was based on applying supplemental irrigation in various ways.
Measurements of solar radiation were used to control additional watering under high evaporative conditions.
The supplemental irrigation system adopted in this study had positive practical results without significant reduction in transpiration due to water stress.
When the accumulated sap flow rates reached a certain point, irrigation was executed at an intensity of 40 ml min-1. In this study, 3 irrigation plots, (1 L, 3 L, and 4.5 L), were examined for sweet pepper cultivation and compared with a general automatic irrigation system based on soil moisture monitoring, determined by a soil moisture sensor.
Automatic drip irrigation systems based on soil moisture measurement have a tendency to decrease crop transpiration under high atmospheric demand conditions.
Two approaches to avoid this decrease were investigated; one approach was based on the location of drip points and the other approach was based on applying supplemental irrigation in various ways.
Measurements of solar radiation were used to control additional watering under high evaporative conditions.
The supplemental irrigation system adopted in this study had positive practical results without significant reduction in transpiration due to water stress.
Publication
Authors
S. Takeuchi
Keywords
irrigation control, sap flow rate, supplemental irrigation, high atmospheric demand conditions, sweet pepper
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