SOIL MOISTURE AND ROOT DISTRIBUTION IN AN APPLE ORCHARD IRRIGATED BY TRICKLERS
The soil moisture distribution at different distances from the water source in a high yielded apple orchard planted on a 60 cm deep heavy basalt soil underlived by gravel was studied. The soil water content was determined in 3 irrigation treatments differed in discharge rates, distances between the tricklers on the laterals and frequency of the application of a similar amount of water. The soil water content was followed during the wetting and drying processes in one irrigation cycle of each treatment. The roots of the trees perpendicular and along the tricklers line were counted in the soil profile. The results showed that the pattern of the root distribution was similar to the moisture distribution which occupied a wider area when 81/h rather than 41/h tricklers were used. The soil moisture saturated level found in the soil profile in the area close to the water source during the irrigation caused water loss by drainage, which was estimated to be 17% of the water applied. A pulsed irrigation applied experimentally, assumed to decrease this drainage loss by supplying the water in pace of the plant consumption.
Levin, I., Assaf, R. and Bravdo, B. (1979). SOIL MOISTURE AND ROOT DISTRIBUTION IN AN APPLE ORCHARD IRRIGATED BY TRICKLERS. Acta Hortic. 89, 81-82