The experiment was conducted during the two seasons (2015 , 2016 ) on the Lemon trees
cv (Meyer ) aiming at studying the effect of the foliar spraying with the nutrients ( boron ,
zinc and iron ) on physical and chemical properties of the fruits Th
ese nutrients were
sprayed separately or as a mixture .
The average of each of the physical properties of the fruit (length , width , firmness,
volume and weight of the fruit ) , in addition to rind thickness and the fruits ` juice volume,
,the chemical properties of the fruit juice (total soluble solids, total sugars, total acidity,
vitamin C) were studied. An increase was observed in all the studied parameters in the
sprayed treatments compared to the control from( 6.37%- 3.33% -0.37% -
34.57mg%)to(9.33% -4.88% -1.89% -43.5%) in the first season and( 9.75% 5.87- 3.32% -
45%) in the second season, respectively. As a result of the statistical analysis, there were
significant differences between all the studied treatments and the control with overpass of
the treatment of the three elements (iron chelate + boron oxide + zinc chelate ) of all
treatments in the most of the studied figures in both seasons. Statistical analysis of the fruit
rind thickness showed the absence of the significant differences among the studied
treatments.
This study was conducted in a green house at the Faculty of Agriculture
Sana'a University, during 2000-2001 and 2002 growing season. The objective
of the study was to obtain a genetic information on total soluble solids in the
tomato fruits in ord
er to estimate the gene action effects, which control
inheritance, heterosis, degree of dominance and heritability in term of broad
sense and narrow sense, as will as, reduction inbreeding depression in F2, for
understanding the suitable method for genetic improvement of quality.
Two tomato cultivars were used for genetic screening and cross breeding for
F1 hybrid production. F1 was cross bred with the parents for getting back cross
P1 and P2. Also, F2 was obtained. The results revealed, the heterosis in F1 based
on average of mid parents was 7.94% as compared with average of higher
parents (-2.21%). The degree of dominance was less than 1.0, which indicate
partial dominance, additive gene action variance was higher than the non
additive gene action variance which reflected on the narrow sense heritability
(h2 n.s), that reached 81.37%. The reduction in inbreeding depression in F2
reached 15.82%. The overall results indicated that, selection and hybridization
methods seem to be a good method for improving quality of total soluble solids
in tomato.
Green tomato fruits of different studied hybrids such as, Amal, Steel,
Tartila, and 2-75/96, which had been grown in a greenhouse at Abi- Jarash
Farm were picked up and stored at temperatures of 12 c and 20 c for 29 days.
The fruits, which were st
ored at 12 c had been transferred to 9 cْ, and then
stored for an additional period of two weeks. The chemical composition of the
stored fruits was evaluated, which included: acidity percentage, total soluble
solids, and the quantity of vitamine C. The ratio of fruit weight loss during
storage was studied as well.
This study was caried out at fields Hort. and Fores. Resea., Depart. of
Agric.Resea.in Ninevah during ١٩٩٨ and ١٩٩٩ growing season to evaluate the
performance of six cultivars of tomato for fresh marketing.
