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Kenyatta University (2021)

Arbuscular Mycorrhizal Fungi and Silicon Effects on Nutrient Uptake, Growth and Yield of Sorghum under Water Stress in Machakos County, Kenya

Gacheri, Kaaria Kallen

Titre : Arbuscular Mycorrhizal Fungi and Silicon Effects on Nutrient Uptake, Growth and Yield of Sorghum under Water Stress in Machakos County, Kenya

Auteur : Gacheri, Kaaria Kallen

Université de soutenance  : Kenyatta University

Grade : Master of Science in Agronomy 2021

Résumé partiel
Sorghum (Sorghum bicolour L. Moench) is an important cereal crop ranked second after maize as a food security in Kenya. However, its production is threatened by low soil fertility and moisture content. Many studies on arbuscular mycorrhizal fungi (AMF) have shown its importance in nutrient and water uptake, resulting in better yields of crops. In addition, silicon helps in plant resistance to both abiotic and biotic stresses. The study evaluated effects of AMF and silicon on nutrients uptake, growth and yield of two sorghum varieties under different water regimes. Two field experiments were carried out in Machakos County, Kenya. A Randomized Completely Block Design (RCBD) in a factorial arrangement was used to lay out the experiment. The factors tested included : Two levels of sorghum varieties (Seredo and Machakos local red), the other factor was water regimes in three levels (20, 40 and 60%) while the third level was silicon and Mychorriza (plus and minus). Sorghum varieties and leek were used as trap plants in a greenhouse experiment. Data collection was done on sorghum growth, yield and nutrient uptake, AMF colonization percentage and AMF diversity. Analysis of variance (ANOVA) was used to analyze data using R software and significant means se parated using Tukey’s test at 5% significance level. The results showed that Seredo variety had the highest shoot dry weight (107 g), longest roots (44.1 cm) and longest period to 50% flowering (76.4%) while Machakos local red had tallest plants (210.9 cm) and highest number of leaves (10.8). At 60% water regime, Si amendment and AMF inoculation enhanced sorghum growth better than other treatments.

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