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sur le développement des zones arides et semi-arides

Titre : Effects of cultivar and planting period on growth, yield, macilage and nutritional composition of corchorus olitorius under field and shade house conditions

Auteur : Mothoa, Pabalelo Emmanuel

Université de soutenance : University of Limpopo

Grade : Master of Science (MS) Horticulture 2022

Résumé partiel
The awareness of the nutritional benefit and consumption of the Jew’s mallow (Corchorus olitorius L.) especially in South Africa is low ; this is predominantly because of lack of access and availability of the crop in the market. This research aimed to determine to what extent would the planting period affect mucilage, growth, yield and nutritional composition of the selected C. olitorius cultivar under different growing conditions and provide a better understanding and scientific evidence for the producers to maximize production. The experiments were carried out simultaneously, the first experiment (field trial), was on the field and the second (pot trial) in the shade house. Treatment factors were : 2 x growing conditions (field and pot), 4 x planting periods (November, December, January and February) and 3 x C. olitorius cultivars (‘Local’, ‘Oniyaya’ and ‘Amugbadu’). The experiments were carried out as randomised complete block design (RCBD) arranged in split-spilt plot with three replications. Growing condition was the main factor, planting period as the sub-factor, while the cultivars were the sub-subplot factor. Mucilage content, growth and yield parameters were measured and nutritional composition of the crop was determined from harvested plant samples. Mucilage content of C. olitorius varied with cultivar and growing condition. The significantly (P < 0.05) highest quantity of mucilage at 8 WAT was obtained from Oniyaya cultivar under field condition whereas the least was recorded from Local cultivar under pot condition. The mucilage content of the three cultivars did not differ significantly (P ≤ 0.05) at 6 WAT, however significant (P < 0.01) differences were recorded at 8 WAT. The cultivar Oniyaya produced significantly highest average (184.58 mPa.s) mucilage content at 8 WAT while the lowest average value (124.58 mPa.s) was recorded in the Local cultivar. This implies that Oniyaya cultivar produced the slimiest plants. The mucilage content of Jew’s mallow appears to decline over time ; thus, the crop had higher mucilage content when young and tender. Selected growth parameters such as chlorophyll, number of leaves and stem diameter were significantly affected by the combined effect of cultivar, planting period and growing condition. For example, the average highest chlorophyll content was obtained in Oniyaya cultivar during November period under pot condition

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