Abstract
Fruit quality of ‘Fuji’ apples ( Malus domestica Borkh.) grafted on three rootstock cultivars (a weeping-type clone of ‘Marubakaidou’ ( Malus prunifolia Borkh. var. ringo Asami), MM.106, and M.26) were investigated in sand culture. The trees were grown in a nutrient solution with nitrogen supplied as ammonium or nitrate. With MM.106 and M.26 rootstocks, fruit from the trees fed with nitrate nitrogen were larger, had better surface color, higher soluble solids, higher levels of sugars, and higher acidity than those fed with ammonium nitrogen. Fruit from trees grafted on MM.106 and M.26 treated with ammonium nitrogen had higher N but lower calcium content than those treated with nitrate nitrogen. With M. prunifolia rootstocks, however, the form of nitrogen supplied had no influence on the surface color, juice quality, and mineral content of the fruit.
Published Version
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