Response of Washington Navel orange plants to application of Helpstar and Saltrad as saline correctors
2015
El-Shazly, Samy M. | Eisa, Ahmed M. | Sarhan, Zeinab H.
The aim of this study is to evaluate the effect of different salinity levels (zero, 1500, 3000 and 4500 ppm NaCl) and salinity correctors Saltrad (CaO) and Helpstar leaf and root chemical composition of Washington Navel orange plants. The results indicated that all vegetative growth parameters (growth rate, plant height, stem diameter, root length, volume index and trunk cross sectional area), leaf chlorophyll content, leaf peroxidase activity and leaf and root contents of carbohydrates, N, P, K, Ca and Mg have decreased, meanwhile leaf and root proline and Na and Cl contents have increased with salinity increments. Salinity correctors enhanced all vegetative growth parameters, chlorophyll, peroxidase activity, proline, carbohydrates and N, P, K, Ca and Mg contents, meanwhile Na and Cl were reduced. Generally, it can be concluded that using Saltrad at 7.5 cm3/pot/month gave the highest values of vegetative growth parameters and leaf and root chemical composition. Due to lack of significance – in most parameters- between Saltrad treatments at 5 and 7 cm3/pot, we recommend the use of Saltrad at 5 cm3/pot/month to reduce the negative impact of salinity on Washington navel orange plants.
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