EFFECT OF SOME BIOLOGICAL FERTILIZERS ON PRODUCTIVITY AND POSTHARVEST FRUIT QUALITY OF 'ADALIA' LEMONS GROWN IN THE UNITED ARAB EMIRATES

A.F. El-Shiekh
This study was done at Dibba Experiment Station, Eastern Region, Ministry of Environment & Water, UAE. Two types of biological fertilizers (alnawaya and super alnawaya) at two different doses, in addition to the regular mineral fertilizer, were added to 10-year-old ‘Adalia’ lemon trees. The study was performed during two consecutive seasons (2009/2010 and 2010/2011). At fully mature stage, fruits were harvested and yield was weighed. Fruit qualitative (fruit weight and dimensions; juice percentage) and quantitative (soluble solids contents, pH, nitrogen, phosphorus and potassium juice contents) measurements were done.
In both seasons, trees supplemented with super alnawaya biological fertilizer at both doses (25 and 50 kg/tree) had the highest yield in comparison with the rest of the treatments. Super alnawaya fertilizer (25 kg/tree) increased tree yield by about 83% over that of the control in the first season while the yield increment was over 100% in the second season. Although alnawaya fertilizer (50 kg/tree) increased tree yield over that of the control, the differences were not significant. No significant differences were noticed between the treatments for average fruit weight, juice percentage, soluble solids contents and pH of juice in both seasons. Fruit height increased significantly as affected by super alnawaya fertilizer (25 kg/tree) in comparison with the control, alnawaya (50 kg/tree) and super alnawaya (50 kg/tree) fertilizers in the first season. However, in the second season, no significant differences were observed between treatments for either fruit height or fruit width. In addition, no significant differences were noticed in nitrogen and potassium contents of fruit juice in the first season. In the contrary, in the second season, nitrogen contents of the fruit juice were increased as affected by all treatments over that of the control. For phosphorus fruit juice contents, the data were not consistent in both seasons. In the first season, alnawaya (25 kg/tree) and super alnawaya (50 kg/tree) fertilizers resulted in a reduction in fruit phosphorus content in comparison with the other treatments. However, in the second season, super alnawaya (50 kg/tree) fertilizer resulted in a reduction in phosphorus fruit content when compared with the other treatments.
As a result of the treatments (in the first season), nitrogen, potassium and magnesium leaves content increased over that of the control while nitrogen only was increased in the leaves in the second season. Also, magnesium leaves content was increased by the treatments but the differences were not significant.
Super alnawaya (25 kg/tree) fertilizer is recommended to be used on 10-year-old ‘Adalia’ lemon trees under the UAE environment rather than alnawaya, super alnawaya (50 kg/tree) or mineral fertilizers.
El-Shiekh, A.F. (2014). EFFECT OF SOME BIOLOGICAL FERTILIZERS ON PRODUCTIVITY AND POSTHARVEST FRUIT QUALITY OF 'ADALIA' LEMONS GROWN IN THE UNITED ARAB EMIRATES. Acta Hortic. 1047, 45-50
DOI: 10.17660/ActaHortic.2014.1047.2
https://doi.org/10.17660/ActaHortic.2014.1047.2
Citrus limon, yield, nitrogen, phosphorus, potassium, alnawaya and super alnawaya fertilizers
English

Acta Horticulturae