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Chuka, Kenya

Oloo-Abucheli G.,Chuka University | Aguyoh J.N.,Egerton University | Gaoquiong L.,Egerton University
Acta Horticulturae | Year: 2015

Greenhouse covering diffuses light that reaches the plant canopy. The diffused light has been found to be advantageous since it prevents shadow formation and enhances light penetration. A myriad of greenhouse covering material have been developed for this purpose. However, spectrum properties and their effect on plant growth are continuously being discovered under different conditions. A field study was conducted in 2012/2013 in a growth tunnel to investigate the effect of UVA 205/N, UV-A milky white and IR-504 poly films on growth of two rose cultivars under natural conditions. The research was carried out under a split plot experiment laid down in a completely randomized block design. The covers exhibited differences in microclimate (greenhouse air temperature, relative humidity and photo synthetically active radiation). The amount of PAR recorded was high under UV-A milky white poly film compared to the coloured IR-504 and UV-A 205/N. Long grades of rose cut flower were obtained under UV-A 205/N cover which received low PAR compared to those grown under UV-A milky white and IR-504. UV-A 205/N had high dry matter accumulation for both stem and flower heads. Dry matter accumulations of plants grown under UV-A clear and IR-504 were not significantly different. Temperature and relative humidity varied significantly (P0.05) under different poly films, these differences had implication on the stem length of rose cut flower. It is evident from the study that UV-A 205/N and IR-504 poly film enhanced production of longer rose cut flower stems compared to UV-A milky white. Source

Ondiek J.O.,Egerton University | Abdulrazak S.A.,Egerton University | Njoka E.N.,Chuka University
Livestock Research for Rural Development | Year: 2010

A 56-day experiment was conducted to examine the contribution of Maerua angolensis and Zizyphus mucronata, mixed on a 1:1 ratio as a supplement to growing Small East African Goats fed a basal diet of Chloris gayana hay. Twenty goats were assigned to five treatments of: 0, 15, 20, 25 and 30 g DM kg-1W0.75, assigned as MZ0, MZ15, MZ20, MZ25 and MZ30. The total extractable phenolics (TEPH) and total extractable tannins (TET) for Maerua angolensis (11.4, 3.01 mg kg-1 DM) were lower than for Zizyphus mucronata (72.3, 41.2 mgkg-1DM) and the mixture had average values (41.9, 22.1 mg kg-1 DM), respectively. The Chloris gayana hay had low crude protein content (54 g kg-1 DM). Intake of hay and of total DM, and coefficients of apparent digestibility of diet proximate components, increased with supplementation. The control animals (MZ0) lost weight and the supplemented groups gained weight with best growth on the MZ20 diet. Rumen pH was in the normal range but rumen ammonia N was low for the control diet (8.99 mg 100ml-1), increasing with supplementation to 11.3 - 12.7 mg 100ml-1. There was a positive linear relationship between rumen ammonia level and live weight change. It is concluded that the 1:1 mixture of Maerua angolensis:Zizyphus mucronata with a CP of 261g kg-1 DM is an adequate protein supplement for growing Small East African Goats when fed a low quality (5.4% CP) basal diet of Chloris gayana hay. Source

Mbaabu P.R.,Chuka University | Hussin Y.A.,University of Twente | Weir M.,University of Twente | Gilani H.,International Center for Integrated Mountain Development | Gilani H.,LIAONING Technical University
Journal of the Indian Society of Remote Sensing | Year: 2014

The impact of forest management activities on the ability of forest ecosystems to sequester and store atmospheric carbon is of increasing scientific and social concern. This is because a quantitative understanding of how forest management enhances carbon storage is lacking in most forest management regimes. In this paper two forest regimes, government and community-managed, in Kayar Khola watershed, Chitwan, Nepal were evaluated based on field data, very high resolution (VHR) GeoEye-1 satellite image and airborne LiDAR data. Individual tree crowns were generated using multi-resolution segmentation, which was followed by two tree species classification (Shorea robusta and Other species). Species allometric equations were used in both forest regimes for above ground biomass (AGB) estimation, mapping and comparison. The image objects generated were classified per species and resulted in 70 and 82 % accuracy for community and government forests, respectively. Development of the relationship between crown projection area (CPA), height, and AGB resulted in accuracies of R2 range from 0.62 to 0.81, and RMSE range from 10 to 25 % for Shorea robusta and other species respectively. The average carbon stock was found to be 244 and 140 tC/ha for community and government forests respectively. The synergistic use of optical and LiDAR data has been successful in this study in understanding the forest management systems. © 2014, Indian Society of Remote Sensing. Source

Odhiambo R.,Kenyatta University | Muthakia G.K.,Kenyatta University | Kagwanja S.M.,Chuka University
Bulletin of the Chemical Society of Ethiopia | Year: 2010

New complexes derived from the reaction of Mo(NO)Tp* Cl2 = Tp* = tris(3,5-dimethylpyrazolyl) borate with a series of manganese(II) Schiff bases have been synthesized. Characterization by UV, IR, MS and elemental analysis support their formulations. Cyclic and differential pulse voltammograms of manganese(II) Schiff base monometallic complexes exhibit one reduction peak which may be associated with the reduction of the manganese(II) center. In CH3CN solutions, the molybdenum(II)-manganese(II) bimetallic complexes showed two reversible reduction peaks which are associated with the reduction of the molybdenum and manganese centers. In CH2Cl2, only the reduction of molybdenum(II) center exhibited reversibility while the reduction of manganese(II) center was irreversible. These observations demonstrate that reduction potentials for bimetallic complexes are solvent dependent. © 2010 Chemical Society of Ethiopia. Source

Otachi E.O.,University of Vienna | Otachi E.O.,Egerton University | Magana A.E.M.,Chuka University | Jirsa F.,University of Vienna | And 2 more authors.
Parasitology Research | Year: 2014

In Lake Naivasha, the common carp Cyprinus carpio L. 1758 was accidentally introduced from fish farms adjacent to River Malewa in 1999 and now forms the bulk of the total fish caught. Since its introduction, no study has been made on its parasitic community nor are there any reports on ectoparasites from other fish species in this lake to the best of our knowledge. Therefore, the aim of this study was to describe the parasitic community of C. carpio and two other commercially important fish species: Oreochromis leucostictus and Tilapia zillii. Additionally, the abundant Barbus paludinosus was included in the study. A total of 286 fish (145C. carpio, 56 O. leucostictus, 18 T. zillii, and 67 B. paludinosus) were collected during the year 2011 and examined. Ten taxa of parasites were recovered from C. carpio dominated by the monogenean Dactylogyrus minutus, occurring with a prevalence (p) of 99.3 %. Thirteen taxa of parasites were identified from O. leucostictus dominated by monogeneans Cichlidogyrus spp. (p = 91.1 %). T. zillii harbored nine taxa of parasites with the digenean Tylodelphys sp. (p = 83.3 %) being dominant and B. paludinosus harbored 11 taxa of parasites dominated by an unidentified monogenean of the genus Dactylogyrus (p = 83.6 %). C. carpio had the lowest helminth species diversity and richness while monogenetic trematodes, which have never been reported from fish in Lake Naivasha, were the most prevalent parasites recovered. © 2014 Springer-Verlag Berlin Heidelberg. Source

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