Nutritional quality of selected African leafy vegetables cultivated under varying water regimes and different harvests

Maseko, Innocent; Ncube, Bhekumthetho; Mabhaudhi, Tafadzwanashe; Tesfay, S.Z.; Chimonyo, Vimbayi G. P.; Araya, Hintsa T.; Fessehazion, Melake K.; Plooy, C.P. Du

doi:10.1016/j.sajb.2019.06.016

Cited by 12 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimum rate of N application for high biomass accumulation in Amaranthus, Vigna unguiculata and Corchorus is 50 kg/ha [42] Kraal manure and inorganic fertilisers combined result in high ALV biomass [43] Sheep Kraal manure is ideal for Amaranthus in when inorganic fertilisers are unavailable [44] Remote sensing can be used to predict fertiliser needs for ALVs [45] Amaranthus may require 9.01 g/plant of N for optimum biomass accumulation [46] Functional properties…”

Section: Production Component Conclusion Authormentioning

confidence: 99%

“…Plant nutrition and fertiliser recommendations required to achieve optimum growth in ALV production were summarised in six studies. N application's optimum rate for high biomass accumulation in Amaranthus, Vigna unguiculata, and Corchorus is 50 kg/ha [42]. Two studies recommend the integration of inorganic and organic fertiliser in ALV production systems.…”

Section: Production Component Conclusion Authormentioning

confidence: 99%

See 1 more Smart Citation

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

et al. 2021

View full text Add to dashboard Cite

The economic potential of African leafy vegetables (ALVs) remains obscured by a poorly developed value chain. This scoping review assembled and examined scattered knowledge generated on ALVs across southern Africa, focusing on production, processing, marketing, and consumption. Two electronic databases (Scopus and Web of Science) were screened, and a total of 71 relevant studies were included and evaluated. The review provides a state of the art on knowledge related to utilisation of ALVs across the entire value chain. The findings show that functional properties are of prime importance in the production and consumption of ALVs. However, the lack of improved germplasm and a non-existent seed supply system are significant production bottlenecks. Pests and diseases affecting the productivity of ALVs remain mostly unexplored. Sun-drying and boiling were the most reported post-harvest processing methods, suggesting that traditional processing methods are still prominent. Many studies also confirmed the predominance of informal markets in the trading of ALVs as they fail to penetrate formal markets because of poor product positioning and exclusion from produce demand and supply forecasts. The inception of cultivar development, mechanised processing methods, and market linkages will enhance the profitability of ALVs in the region. This review enhances the gaining of insight into the state of different value chain components will assist in upscaling production, value addition of products, and enhance marketing efficiency. There is a great opportunity for basic and applied research into ALVs.

show abstract

Section: Production Component Conclusion Authormentioning

confidence: 99%

Section: Production Component Conclusion Authormentioning

confidence: 99%

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

et al. 2021

View full text Add to dashboard Cite

show abstract

“…NS treatment had a significant effect on Ca and Mg content in fresh stinging nettle leaves, with the highest values measured during NS1 (depletion). Ca and Mg tend to accumulate in more mature than in young plants ( 40 ), while studies also show that Ca and Mg mass fractions in plant tissues strongly depends on water availability and salinity. Under the conditions of lower water availability and higher salinity, Ca uptake is lower due to reduced absorption and transpiration ( 41 ).…”

Section: Resultsmentioning

confidence: 99%

How to Increase the Nutritional Quality of Stinging Nettle Through Controlled Plant Nutrition

Dujmović,

Opačić,

Radman

et al. 2023

Food Technol. Biotechnol. (Online)

View full text Add to dashboard Cite

Research background. As food production faces major challenges, modern agricultural practices are increasingly focused on conserving resources, reducing negative environmental impacts, and sustainably producing foods high in health-promoting phytochemicals. During the production process, many factors can influence the quality and chemical composition of a final food product. Proper selection of cultivating conditions, especially a balanced nutrition, can significantly increase nutritional value resulting in foods with strong biological and functional properties. Stinging nettle is a rich source of minerals, vitamins, pigments, phenols and other bioactive compounds (BC) and can be consumed as a green leafy vegetable with beneficial effects on human health. Therefore, the aim of this study was to determine the nutritional quality and antioxidant capacity of stinging nettle leaves under the influence of different nutrient solution (NS) treatments during three mowings. Experimental approach. The experiment was performed in a floating hydroponic system, with different treatments of NS application during three mowings. After each mowing, the following treatments were differed: treatment 1 – depletion with water, treatment 2 - supplementation with standard NS, and treatment 3 - correction with nutrients. Of the BC minerals, ascorbic acid, phenols, and photosynthetic pigments content, as well as antioxidant capacity were analyzed spectrophotometrically, while individual phenols were determined by liquid chromatography. Results and conclusions. Different nutrition solution treatments and the number of mowings had a significant influence on the content of the analyzed BC. The highest contents of total phenols (377.04 mg GAE/100 g fm), total flavonoids (279.54 mg CTH/100 g fm), ascorbic acid (112.37 mg/100 g fm), and pigments (total chlorophylls 1.84, and total carotenoids 0.36 mg/g), as well as the highest antioxidant capacity (35.47 µmol TE/g) were recorded in the third mowing, with nutrient solution supplementation. Novelty and scientific contribution. This is the first time that stinging nettle leaves are produced in a floating hydroponic system by controlled plant nutrition. We establish this type of nutrition manipulation during multiple mowings as an innovative technique for the production of novel food with high and improved nutritional value suitable for consumption as green leafy vegetables.

show abstract

“…The analysis on the nutritional content of trade flows is based on US food composition tables (USDA 2023). This is a limitation of our analysis as there are regional differences in food composition due to a range of factors, such as different varieties of crops 1 , soil quality (for instance there is a soil zinc deficiency in Africa, as highlighted in Singh et al 2023), growing conditions (Maseko et al 2019), and food processing techniques (Pretorius et al 2023). To assess the extent to which this shortcoming affects our conclusions, a sensitivity analysis (described in Appendix 3.1) is performed in which the results obtained using the US food composition tables are compared to those we get using food composition tables specific to West Africa (Vincent et al 2020).…”

Section: Methodsmentioning

confidence: 99%

2023 Africa Agriculture Trade Monitor (AATM)

Odjo¹,

Traoré²,

Zaki³

2023

View full text Add to dashboard Cite

Nutritional quality of selected African leafy vegetables cultivated under varying water regimes and different harvests

Cited by 12 publications

References 25 publications

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review

How to Increase the Nutritional Quality of Stinging Nettle Through Controlled Plant Nutrition

2023 Africa Agriculture Trade Monitor (AATM)

Contact Info

Product

Resources

About