Sink activity in Washington navel orange fruit borne on leafy and leafless inflorescences

2017 ◽  
Vol 38 (1) ◽  
Author(s):  
Vardis E. Ntoukakis ◽  
Fayek B. Negm ◽  
Carol J. Lovatt
Keyword(s):  
Navel Orange ◽  
Sink Activity ◽  
Washington Navel ◽  
Orange Fruit

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

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.

The development of the fruit of the Washington Navel orange

1959 ◽  
Vol 10 (6) ◽  
pp. 804 ◽  
Author(s):  
D Bouma
Keyword(s):  
Detrimental Effect ◽  
Dry Weight ◽  
Nitrogen Supply ◽  
Navel Orange ◽  
Stages Of Development ◽  
Nitrogen Levels ◽  
Cultural Systems ◽  
Washington Navel ◽  
Orange Fruit ◽  
Excessive Accumulation

A study is presented on the development of the Washington Navel orange fruit in a factorial field experiment. The development of the fruit was similar in the two cultural systems studied, but the level of nitrogen supply had pronounced effects in the later stages of development. Peel thickness reached a peak early in January, but became thinner till the end of March. The rate of thinning was higher, the lower the level of nitrogen supply. From March onwards the peel thickness increased again at the highest nitrogen level, but it continued to decrease at the lowest level. Dry weight of the peel increased much faster at the higher than at the lower nitrogen levels. The level of nitrogen supply had a relatively small effect on nitrogen moving to the pulp. Considerable differences, however, were found in the nitrogen going to the peel, particularly during the period in which major differences in peel thickness and weight developed. Leaf analyses suggested that at least part of the nitrogen going to the peel at the highest nitrogen levels came from the leaves. Total phosphorus in the pulp was much higher than in the peel during the later stages of development. The quantities of phosphorus moving to the pulp were considerably higher at the lower than at the higher nitrogen levels. The results are discussed in relation to some cultural and fertilizer practices. These should aim at a nitrogen supply just sufficient to maintain yields, and so avoid the excessive accumulation of nitrogen in the tree, with its consequent detrimental effect on fruit quality.

Sign in / Sign up

Export Citation Format

Share Document