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Tshwane University of Technology (2016)

Growth and quality of different types of hot pepper as influenced by irrigation system and irrigation rate

Chabalala, Mafanato Francis

Titre : Growth and quality of different types of hot pepper as influenced by irrigation system and irrigation rate

Auteur : Chabalala, Mafanato Francis

Université de soutenance : Tshwane University of Technology

Grade : Magister Technologiae : Agriculture 2016

Résumé
The effective use of irrigation has become a key component in the production of high value crops such as hot pepper (Capsicum spp.) in arid and semi-arid regions. The objective of study was to evaluate growth and yield of four types of hot pepper grown under hot climatic conditions in the Limpopo Province of South Africa using drip and centre pivot irrigation systems. Four independent field trials were conducted at Ukulima Farm under either drip irrigation at 75% of field capacity (FC) or centre pivot irrigation system at 100%, 75% or 50% of FC. Each trial was laid out as a randomized complete block design with four replications. Treatments in each irrigation system consisted of four pepper types randomised within the four block replications. The four pepper types were Jalapeno, Long Slim Cayenne, Habanero Red and Serrano Chili. Parameters that were recorded included plant height, number of leaves, number of primary and secondary branches, days to 50% flowering, total number of fruit and fruit mass. The physico-chemical parameters and the bioactive compounds were determined from freshly harvested hot pepper types. The combined data of the four trials were subjected to an appropriate analysis of variance (ANOVA). Means of significant effects were compared using Student’s t-LSD (least significant difference) at a 5% significance level. For all irrigation systems, there were no significant interactions between pepper type and irrigation rate for plant height, number of leaves and number of primary branches. The data indicated that 100% irrigation of centre pivot results in taller plant, with increased number of leaves and secondary branches. However, there were interactions between pepper type and irrigation rate for number of secondary branches, days to 50% flowering, total fruit number and fresh mass. Days to 50% flowering was reached in a shorter period when 100% irrigation was used. Highest total fruit numbers were found when 100% and 75% of centre pivot irrigation was used. Highest fresh mass on all pepper types was obtained at 100% irrigation when compared to other irrigation treatments. Hot pepper plants performed better under centre pivot compared to drip irrigation system. There were significant interactions between pepper type and irrigation rate for total soluble solids. The lowest amount of irrigation applied during the trial increased the total soluble solids level. There were no significant interactions between pepper type and irrigation rate for ascorbic acid, pH, titratable acidity, phenolic content, flavonoids content and total antioxidants activity.

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