Effect of Planting Density on Fruit Yield under Different Cultural Treatments in Satsuma Mandarin Tree
| Autor: | Sunao Tachibana, Setsuo Morioka, Shigeo Nakai |
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| Rok vydání: | 1987 |
| Předmět: | |
| Zdroj: | Journal of the Japanese Society for Horticultural Science. 56:9-15 |
| ISSN: | 1880-358X 0013-7626 |
| DOI: | 10.2503/jjshs.56.9 |
| Popis: | In 1967, two-year-old trees of‘Miyagawa Wase’, an early ripening satsuma mandarin, were planted at various planting densities and grown under different cultural treatments until 19 years old.Planting densities were 1, 250, 2, 500, 5, 000 and 10, 000 trees/ha. Cultural treatments adopted were shallow plowing+less fertilization, or deep plowing+standard fertilization and non pruning+non fruit thinning, or pruning+fruit thinning.The effect of planting density on fruit yield per unit area was determined from data obtained during the period from 1969 to 1984 (tree age from 4 to 19 years old). The effect of the cultural treatments on yield was also determined.1. The yields of high density plots, 5, 000 and 10, 000 trees/ha, increased rapidly with tree age, and then started to decrease gradually. The yields of the lower density plots, 1, 250 and 2, 500 trees/ha, gradually increased in the early years, but soon exceeded those of the high density plots.This trend was almost the same under all of the cultural treatments.2. Planting densities which gave the maximum yield were 10, 000 trees/ha after 4-5 years; 5, 000 trees/ha after 6-7 years; 2, 500 trees/ha after 8-13 years; 1, 250 trees/ha after 14-19 years. The average maximum yield for the planting densities at each tree age (4-19 years old) was 68t/ha.3. With non pruning+non fruit thinning, the trees allowed to bear the first crop showed the alternate bearing habit as early as the following year.With the pruning+fruit thinning, the lower the planting density, the later the alternate bearing habit occurred.4. The yield fluctuations from year to year were larger with the deep plowing +standard fertilization. There was no significant difference in the average yield between the two treatments.The yield fluctuations were apparently larger with the non pruning+non fruit thinning than with the pruning+fruit thinning. The average yield was slightly higher in the former than in the latter. |
| Databáze: | OpenAIRE |
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