Abstract
The nutrient
concentration of most crops depends on factors such as amount of water, growing
environment, sunlight, and soil types. However, the factors influencing
nutrient concentration of African horned cucumber fruit are not yet known. The
objective of the study was to determine the effect of different water stress
levels, soil types, and growing environments on the nutrient concentration of
African horned cucumber fruit. Freeze-dried fruit samples were used in the
quantification of β-carotene and total soluble sugars. The
results demonstrated that plants grown under the shade net, combined with
severe water stress level and loamy soil, had increased total soluble sugars
(from 8 to 16 °Brix). Under the shade-net environment, the combination of
moderate water stress level and loamy soil resulted in increased crude protein
content (from 6.22 to 6.34% °Brix). In addition, the severe water stress
treatment combined with loamy soil, under greenhouse conditions, resulted in
increased β-carotene content (from 1.5 to 1.7 mg 100 g−1 DW).
The results showed that African horned cucumber fruits are nutrient-dense when
grown under moderate water stress treatment on the loamy or sandy loam
substrate in the shade-net and open-field environments.
Keywords:
Biochemical constituents
β-carotene
Vitamins;
Micro-nutrients;
Growing environments
By Thesis Doctor
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