EFFECT OF FOLIAR SPRAYING WITH SEAWEEDS CONCENTRATE ON FRUIT SET, YIELD, FRUIT QUALITY AND LEAF CHEMICAL COMPOSITION OF VALENCIA AND WASHINGTON NAVEL ORANGE TREES

This part of the investigation studied the effect of foliar spraying with urea (0.5%); a mixture of Zn (0.4%), Mn (0.3%), Fe (0.5%), and Cu (0.3%) in sulphates (from 23% Zn, 28% Mn, 19% Fe, and 30% Cu, respectively); and two growth regulators (GA3 at 25 ppm and α-NAA at 10 ppm); as well as number and date of sprays on fruit pedicel pectin content, some flowering aspects, and fruit set and drop percentages. Applying urea, micronutrients, or both significantly increased pectin content in the pedicels of the attached and dropped fruit. The treatment including urea plus micronutrients resulted in the highest values for pectin in fruit stem. Either GA3 or NAA significantly raised pectin content over that of the water-sprayed control. However, NAA was more effective in increasing pectin content in fruit pedicel. The overall treatment including urea and micronutrients with GA3 or NAA was the most effective in producing the highest percentage of leafy inflorescence in 1991–92 and 1992–93 seasons. Any nutrition treatment was significantly effective in increasing fruit set and reducing fruit drop compared with the water-sprayed control; however, the treatment including all sprayed nutrients was the most effective. Application of GA3 or NAA significantly increased fruit set percentage and reduced June and preharvest fruit drop; however, NAA was more effective in reducing fruit drop than GA3.

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Effect of Foliar Applications of Urea on Flowering, Fruit set, Yield and Fruit Quality of Washington Navel Orange Trees

Egyptian Journal of Horticulture ◽

10.21608/ejoh.2016.3552 ◽

2016 ◽

Vol 43 (2) ◽

pp. 299-316

Keyword(s):

Fruit Quality ◽

Fruit Set ◽

Navel Orange ◽

Washington Navel ◽

Orange Trees

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EFFECT OF FOLIAR SPRAY WITH GIBBERELLIC ACID AND AMCOTONE ON FRUIT SET, DROPPING, COMPONENT YIELD AND FRUIT QUALITY OF WASHINGTON NAVEL ORANGE TREES

Journal of Plant Production ◽

10.21608/jpp.2013.73417 ◽

2013 ◽

Vol 4 (6) ◽

pp. 1015-1034

Author(s):

A. Hikal

Keyword(s):

Gibberellic Acid ◽

Fruit Quality ◽

Fruit Set ◽

Foliar Spray ◽

Navel Orange ◽

Washington Navel ◽

Orange Trees

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The Efficiency of Calcium Boron and Carpox-K Sprays on Fruit Quality of Washington Navel Orange Trees

Asian Journal of Soil Science and Plant Nutrition ◽

10.9734/ajsspn/2020/v6i430095 ◽

2020 ◽

pp. 23-31

Author(s):

A. A. EL- Khwaga ◽

F. M. Abd El- Latif ◽

M. H. M. Baiea ◽

S. F. EL- Gioushy

Keyword(s):

Fruit Quality ◽

Chemical Properties ◽

Quality Parameters ◽

Navel Orange ◽

Fertilization Program ◽

Washington Navel ◽

Orange Fruit ◽

Physical And Chemical ◽

Orange Trees

This research was conducted during seasons 2018 & 2019 on nine-years-old Washington navel orange trees. These trees were grafted on Sour orange rootstock, planted at 5 x 5 meters apart, under surface irrigation conditions, in a private orchard at Manzala village, Toukh region, Qalubia Governorate, Egypt. The seven treatments were used for comparison as follows: T1-100% of chemical NPK (NPK fertilization program adopted at 5, 3 and 1 kg/tree from (NH4)2SO4, superphosphate and K2SO4, respectively) according to the Ministry of Agriculture Recommendation (Control or recommended doses RD). T2-RD+Calcium boron 2 cm3 /L; T3-RD+Calcium boron 3 cm3/L; T4-RD+Carpox-K 1g/L; T5-RD+Carpox-K 1.5g/L; T6-RD+Calcium boron 2 cm3 /L +Carpox-K 1g/L, and T7-RD+Calcium boron 3 cm3/L +Carpox-K 1.5g/L. The main goal of this investigation was directed towards increasing Washington navel orange fruit quality. The obtained data revealed that all investigated treatments increased fruit quality parameters (physical and chemical properties). However, T7- RD + Calcium boron 3 cm3 /L + Carpox-K 1.5g/L was statistically superior. On the contrary, T1- Control or recommended doses (RD) ranked statistically the lowest treatment in this concern. From the obtained results, It can be concluded that the use of RD+ Calcium boron 3 cm3 / L + Carpox-K 1.5g / L or RD+ Calcium boron 2 cm3/ L + Carpox-K 1g / L could be safely recommended under similar environmental and horticultural practises adopted in this experiment.

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