Response of Baladi mandarin trees under long irrigation periods to mineral fertilization [Egypt]
1988
El-Sammak, A.F. | Zayan, M.A. (Tanta Univ., kafr-El-Sheikh (Egypt). Faculty of Agriculture)
During two years investigation on 15 years old Baladi manadrin trees, grafted on sour orange rootstocks and grown in heavy loam soil, under shortage of water supply, effects of N, NP and NPK fertilizations on water relations, growth yield and fruit qualities were tested. The results revealed that the three fertilizers increased leaf turgidity and decreased water content of leaves during the growth season. The three fertilizers decreased diurnal changes of turgidity and moisture of leaves. Thus, drought resistance, growth and yield were increased and fruit qualities were affected. The results revealed also that N and NPK fertilization have increased number of fruits per tree, size and weight of fruits. While, NPK increased juice volume and number of seeds per fruit and vitamin C content of juice. NP fertilization has increased size and weight of fruits, juice, volume per fruit, vitamin C content and T.S.S. percentage of juice. Acidity of fruit juice was not affected by any of the used fertilization, while all fertilizations have delayed fruit degreening.
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