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SPATIAL VARIABILITY OF SOIL WATER TENSION IN AN IRRIGATED SOIL

We installed 99 tensiometers along a 76-m row planted with chile pepper and irrigated through trickle tubing placed 5 cm below the soil surface. We collected data on soil water tension after the plants had a leaf area index greater than 3. Readings were taken after the row was irrigated through the trickle line and also after rainfall. Additional readings were taken at the end of the growing season after surface flooding the row from both sides. There was extensive variability and little spatial dependence (distance of dependence was always less than 6 cm) in soil water tension measured along the row of chile peppers. We found variability and spatial dependence to be a function of the method of water application, time after water application, and the magnitude of the soil water tension. Variability was greatest and spatial dependence smallest for water application through a trickle line. Variability was the least and spatial dependence the greatest after rain or extensive flooding.