Effect of fruit bagging and application of additional nitrogen fertilizer on color development of 'Fuji' apples
1989
Byun, J.K. | Byun, B.Y. | Chang, K.H. (Yeungnam Univ., Coll. of Agriculture and Animal Science)
The effects of fruit bagging and application of N on color development and quality of 'Fuji' apple fruits were studied. In the late fall of previous year 15Kg/10a of N was applied and additional 250 and 750g of N per 15-year-old apple tree were applied in late May. In middle of June, 200 fruits per tree were wrapped with double paper bags for color improvement and a half of total number of bags removed on Sept. 20 and remainders on Sept. 30. N contents decreased slowly in leaves, moderately in peels and rapidly in fleshes as growing season. 750g N per tree increased N contents in peels at harvest only. Bagging of fruits decreased chlorophyll contents but increased anthocyanin in the peels. Additional N did not affect the chlorophyll contents in leaves and peels. Anthocyanin contents of peels at 750g N were lower compared with 0 or 250g N fruits in bagged fruits. Flesh firmness decreased by additional 750g of N per tree but soluble solids and total acidity were not changed. Bags can be removed between Sept. 20 and Sept. 30 for better color development and quality of apple fruits
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