Title:
Assessment of growth and biomass production potential of indignenous succulents in Namibia under controlled conditions
Author(s):
Publication Year:
2024
Abstract:

Succulent plants, renowned for their drought tolerance, offer a potential solution to Namibia's challenges in energy and food security by serving as a biofuel substitute and a source of feed for livestock and wildlife. With significant reliance on neighbouring countries for energy imports and ongoing issues of land degradation and water scarcity, cultivating indigenous succulents could help address these challenges while providing opportunities for local farmers. However, limited research exists on the biomass production potential of indigenous Namibian succulents. This study compared two succulent species (Sisyndite spartea and Tetragonia schenkii) with one non-succulent species (Arthraerua leubnitziae) to evaluate propagation potential under controlled, low-input conditions, aiming to identify suitable species for biomass production and determine optimal cultivation methods. A multi-step process, including literature review, expert consultation, and preliminary trials, was used to select species based on rapid growth, drought tolerance, and biomass potential. Propagation methods tested included stem and leaf cuttings, as well as seed sowing, under controlled conditions in two nurseries with different environmental conditions, which influenced germination and seedling survival. Various factors, such as soil medium, watering schedules, and environmental conditions, were assessed to determine optimal propagation success. The study found significant variation in propagation success from seed, with Tetragonia schenkii achieving 100% germination in sand and Sisyndite spartea performing well in Hygromix. Arthraerua leubnitziae exhibited no germination in any tested medium. Survival rates were higher for the seedlings of S. spartea (84%) under favourable microclimatic conditions, while T. schenkii had a survival rate of only 40%. Soil composition was critical for cutting survival, with sand proving most effective for species like Cynanchum viminale and Ruschia axthelmiana. The findings highlight the importance of tailored propagation techniques, especially for species with unique growth forms, such as R. axthelmiana, which requires adjustments in propagation methods. These results underscore the need for more research into the specific environmental needs of succulent species native to Namibia. Future studies should focus on optimizing environmental conditions, pre sowing treatments, and refining propagation techniques to maximize biomass production potential. This research provides a foundation for sustainable cultivation practices that could contribute to both ecological preservation, horticulture and biomass production in Namibia. Keywords: Succulent plants, biomass production, propagation methods, drought tolerance, Namibia, sustainable cultivation.

Place:
Windhoek
Publisher:
Namibia University of Science and Technology (NUST)
Item Type:
Thesis
Language:
en