Effect of planting density on the quality of wase satsuma mandarin [Citrus reticulata] fruits grown under different cultural treatments
1996
Tachibana, S. (Chiba-ken. Horticultural Experiment Station, Tateyama (Japan))
In this experiment,effects of the planting density and various cultural treatments on fruit quality were determined using Miyagawa Wase, an early ripening satsuma mandarin. the planting densities were: 1,250, 2,500, 5,000, and 10,000 trees/ha. Additional treatments were: A, shallow plowing + limited fertilization with no pruning and no fruit thinning; B, shallow plowing + limited fertilization with pruning and fruit thinning; C, deep plowing + standard fertilization but no pruning and no fruit thinning, and D, deep plowing + standard fertilization with pruning and fruit thinning. Furthermore the relationship between leaf area index (LAI) and fruit quality was also examined. The percentages of pulp weight, sugar content,sugar-acid ratio, and rind color in the shallow plowing + limited fertilization plot were higher than those obtained from the deep plowing + standard fertilization plot; the fruit quality in the pruning + fruit thinning plot was higher than that observed in the no pruning + no fruit thinning plot. The acid content was lower in the shallow plowing + limited fertilization plot than in the deep plowing + standard fertilization plot. The mean fruit weight was larger in the pruning + fruit thinning plot than in the no pruning + no fruit thinning plot. With the higher planting densities, the percentages of pulp weight, sugar content and acid content increased, but the sugar-acid ratio and rind color decreased. As for fruit quality, the acid content increased linearly with LAI, whereas the sugar acid ratio decreased with increasing LAI. The rind color was acceptable and did not significantly change over a range of LAI from 1 to 5, but above LAI 5, it was poor
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