EFFECT OF UREA, SOME MICRONUTRIENTS AND TWO GROWTH REGULATORS FOLIAR SPRAYS ON VEGETATIVE GROWTH, YIELD AND FRUIT QUALITY OF WASHINGTON NAVEL ORANGE TREES | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 14, Volume 25, Issue 2, July 2011, Page 152-163 PDF (497.95 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2011.195643 | ||||
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| Authors | ||||
| Ensherah A. H. Tayeh1; Eman A. A. El-Khalek2; Zeinab A. I2; M.Y. Hegab1 | ||||
| 1Hort. Res. Instit. Agric. Res. Centre, Giza, Egypt | ||||
| 2Hort. Dept., Fac. of Agric., Fayoum, Univ., Egypt | ||||
| Abstract | ||||
| This investigation was carried out during the two successive seasons 2008 and 2009 on 25- years old Washington Navel orange trees grown in an orchard at El- Nobaria sector, El- Behera governorate to study the effect of foliar spraying with urea (0.5%), a mixture of Zn (0.4%), Mn (0.3%), Fe(o.5%) and Cu (0.3%) in sulphate salts form (23% Zn, 28% Mn, 19% Fe and 30%Cu), respectively and two growth regulators, GA3 at 25 ppm and NAA at 10ppm. The trees spraying were two ones, the first before flowering (the third week of Feb.), and the second spraying applied four weeks after fruit set to study the effect of these treatments on some vegetative growth characters and leaf mineral contents, Fruiting aspects (set, drop and Preharvest drop) percentage, yield per tree by number and weight, as well as the average weight of fruits and some fruit physical and chemical properties. The obtained results showed that the treatments included spraying Urea& micronutrients (Zn, Mn, Fe and Cu), Urea and NAA achieved the highest values for average leaf area and shoot diameter. Regarding shoot length, Urea& micronutrients followed by GA3 had the highest values. Leaf analysis showed that the highest values of leaf N content obtained by using Urea, Urea& micronutrients, GA3 and NAA, respectively. The lowered values of leaf N content recorded when using micronutrients treatment followed by control. All treatments were significantly effective in increasing fruit set and reducing fruit drop as compared with control. Application of NAA, Urea & micronutrients and GA3 significantly increased fruit set percentage and reduced June and pre-harvest fruit drop, however NAA was more effective in reducing fruit drop than GA3. Spraying Washington Navel orange trees with Urea & micronutrients and NAA significantly increased the number of fruit per tree, yield per tree. However, the treatment included both of Urea & micronutrients Followed by GA3 were the most effective in increasing fruit weight and pulp weight. Spraying of Urea and micronutrients slightly reduced juice acidity and increased T.S.S., total sugars and ascorbic acid contents as well as T.S.S./ acid ratio. In the contrary, either of GA3 or NAA caused the same increase in ascorbic acid content in the juice. | ||||
| Keywords | ||||
| Washington Navl organge - Urea-Micrandrients; Growth regulators; Foliar sprays | ||||
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