scholarly journals Effect of pre-harvest chitosan foliar application on growth, yield and chemical composition of Washington navel orange trees grown in two different regions

2016 ◽  
Vol 10 (7) ◽  
pp. 59-69 ◽  
Author(s):  
Hussien Hanafy Ahmed Ahmed ◽  
Ramadan Aboul-Ella Nesiem Mohamed ◽  
Ali Allam Hesham ◽  
Fahmy El-Wakil Amira
Keyword(s):  
Chemical Composition ◽  
Foliar Application ◽  
Growth Yield ◽  
Navel Orange ◽  
Washington Navel ◽  
Orange Trees

scholarly journals Winter Application of Low-biuret Urea to the Foliage of `Washington' Navel Orange Increased Yield

1994 ◽  
Vol 119 (6) ◽  
pp. 1144-1150 ◽  
Author(s):  
Anwar G. Ali ◽  
Carol J. Lovatt
Keyword(s):  
Foliar Application ◽  
Negative Impact ◽  
Irrigation Treatment ◽  
Poncirus Trifoliata ◽  
Optimal Time ◽  
Navel Orange ◽  
Total N ◽  
Soil Application ◽  
Washington Navel ◽  
Orange Trees

The objective of this study was to test whether a single winter prebloom foliar application of low-biuret urea would increase the yield of 30-year-old `Washington' navel orange trees [Citrus sinensis (L.) Osbeck] on Troyer citrange rootstock [C. sinensis `Washington' × Poncirus trifoliata (L.) Raf.]. All trees received a winter (November to January) soil application of urea (0.5 kg N/tree). Trees were maintained under irrigation or irrigation was withheld from 1 Oct. to 1 Mar. To determine the optimal time for foliar urea application, trees in both irrigation main plots received one application of low-biuret urea in mid-November, mid-December, mid-January, or mid-February applied at a rate of 0.16 kg N/tree. There was a set of control trees that only received the soil application of urea. Trees receiving foliar-applied urea in mid-January or mid-February, independent of irrigation treatment, had significantly greater yield and fruit number per tree each year than the control trees for 3 consecutive years. The number of fruit with diameters of 6.1 to 8.0 cm increased significantly as yield increased (r2 = 0.88). Withholding irrigation from 1 Oct. to 1 Mar. had a negative impact on yield. Annual winter application of low-biuret urea to the foliage did not significantly increase leaf total N at the end of 3 years.

scholarly journals Foliar Application of ZnSO4 and CuSO4 Affects the Growth, Productivity, and Fruit Quality of Washington Navel Orange Trees (Citrus sinensis L.) Osbeck

Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 233
Author(s):  
Sherif Fathy El-Gioushy ◽  
Rokayya Sami ◽  
Amina A. M. Al-Mushhin ◽  
Hanan M. Abou El-Ghit ◽  
Mohamed S. Gawish ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Fruit Quality ◽  
Vegetative Growth ◽  
Foliar Application ◽  
Foliar Spray ◽  
Navel Orange ◽  
Effective Response ◽  
Washington Navel ◽  
Orange Trees

The goal of this study was to examine how to improve the vegetative growth, nutritional status, productivity, and fruit quality of Washington navel orange trees by examining the effect of foliar application of ZnSO4 (0, 300, and 600 mg/L) solutions in combination with CuSO4 (0, 200, and 400 mg/L) solutions on Washington navel orange trees, which were 11 years old and grown in clay loam soil with a surface irrigation system. The results showed that all the investigated measurements responded specifically to each investigated factor. ZnSO4 elicited a stronger and more effective response than CuSO4. Nonetheless, the response varied only slightly or moderately from one measurement to the next. In terms of the interaction effect between ZnSO4 and CuSO4 concentrations, the effect of each investigated factor was directly reflected in its combinations, with ZnSO4 (600 mg/L) and CuSO4 (200 and 400 mg/L) being the most effective for the majority of the measurements under consideration. When the highest level of ZnSO4 was combined with the highest level of CuSO4, the highest values for the various vegetative growth parameters shoot length and diameter, number of leaves per shoot, leaf area, and total assimilation area per shoot were obtained. As a result, the nutritional status (the highest total leaf chlorophyll and leaf mineral contents) was significantly coupled with the treatment of 600 mg/L ZnSO4 in combination with 400 mg/L CuSO4. Moreover, the combinations of the highest ZnSO4 concentration (600 mg/L) and CuSO4 concentration (400 mg/L) exhibited the greatest statistical values of the measurements of fruiting aspects as well as fruit quality. Consequently, it can be recommended that using 600 mg/L ZnSO4 in combination with 400 mg/L CuSO4 as a foliar spray on monthly basis during the period from March to July could be safely recommended under similar environmental conditions and horticulture practices adopted in the present experiment.

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