Environmental and Management Factors That Influence <i>Commelina</i> Species in Selected Agro-Ecological Zones in Western Kenya — Oak Academic Publishing
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Environmental and Management Factors That Influence <i>Commelina</i> Species in Selected Agro-Ecological Zones in Western Kenya
Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
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Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
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Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
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Department of Crops, Horticulture and Soils, Egerton University, Njoro, Kenya
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East African Herbarium, National Museums of Kenya, Nairobi, Kenya
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East African Herbarium, National Museums of Kenya, Nairobi, Kenya
1 Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
2 Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
3 Department of Plant, Animal and Food Science, Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
4 Department of Crops, Horticulture and Soils, Egerton University, Njoro, Kenya
5 East African Herbarium, National Museums of Kenya, Nairobi, Kenya
6 East African Herbarium, National Museums of Kenya, Nairobi, Kenya
Commelina species are plant resources full of promise as future food and feed th at thrive in diverse ecosystems. They are medicinal plants, leafy vegetables, forage for ruminants, feed for cricket insects, crop protection , and fuel. How ever, information regarding factors driving Commelina in agro-ecological zones in Western Kenya is lacking. Therefore, we investigated the diversity of Commelina species, the composition of associated weed species as well as environmental and management factors affecting their diversity and distribution based on 22 variables from 12 production sites. In the survey, 115 species belonging to 30 families were recorded of which 11 Commelina species were identified. Among Commelina species, Commelina diffusa and Commelina benghalensis var. benghalensis (non-hybrid variant) had higher relative density. Multiple linear regression s revealed that the environment ( exchangeable so dium percentage , magnesium , soil pH , and total nitrogen ) and manageme nt ( agriculture system type ) variables exert a stronger effect on the diversity of Commelina species. Detrended Correspondence Analysis detected different ecological conditions for Commelina species and the composition of associated weed species. The forward selection based on Canonical Correspondence Analysis indicated that the distribution of C ommelina species responded significantly to soil pH , available phosphorous , total nitrogen , fertility , and crop spacing . Partitioning variation showed the great importance to the environment than management (10.57% versus 5.97%). The low shared varianc e (environment × management) was - 0.4%, indicating that the two factors have a more individualistic than interactive nature. However, the 83.86% that rem ained unexplained was attributed to stochastic variation or unmeasured variables. This study suggests that the identified five important variables affecting the distribution of Commelina species will certainly contribute to the prioritization of ecological aspects leading to the grow th condition of Commelina species.
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