Relationship between confined soil volume and growth, yield and fruit quality on root confinement culture of satsuma mandarin [Citrus unshiu] cv. "Aoshima Unshu"
1998
Sawano, I. (Shizuoka-ken. Citrus Experiment Station, Shimizu (Japan)) | Yamazaki, T. | Sugiyama, K. | Taniguchi, T.
Growth characteristics of satsuma mandarin (Citrus unshiu Marc.) tees in confined soil volume (40. 75, 150 and 300 liters) using a non-woven fabric were studied for six years. 1) Trunk circumference and number of leaves per tree decreased as the soil volume was further reduced. This was evident in older trees. Number of leaves per tree had a tendency to reach the maximum value in each soil volume, while trunk circumference increased with tree age. This age was lower in smaller soil volume. 2) The smaller soil volume resulted in reduced fruit yield per tree. The trees grown in confined soil volume of 40 liters were biennial bearing fruit. 3) Sugar and acid content in the juice increased and soil moisture decreased as the soil volume was further reduced for three years after planting. However, these relationships were not so evident in older trees. We conclude that, when the number of leaves per tree reaches the maximum value, the confine soil volume has little effect on sugar an
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