Effect of nitrogen application by soil and foliage on mineral and chemical composition of Jonathan apples
1995
Ibrahim, Z.I. (Omer El-Buktar Univ. Horticult. Dept., El-Beida-Libya) | Papp, J. | Toth, T. (Kerteszeti es Elelm. Egyetem, Budapest (Hungary))
Apple trees cv. Jonathan grafted on MM 106 rootstock and planted in 1980 were fertilized with nitrogen. In addition to the control, three nitrogen treatments were used, one as soil application and two as urea spray treatments. The result showed that the urea spray increased significantly five times the nitrogen content of apple fruits. Both phosphorus and potassium content of the fruit were depressed significantly in most of the years. Calcium content increased, but it was not significant. Soluble solids and reducing sugars of apple fruits increased significantly by nitrogen application. Acid and starch contents were influenced slightly by the nitrogen treatments
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