Browsing by Author "Githiri, S.M."

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Effect of source, time and method of nitrogen application on growth and yield components of potato in Kenya
(Bioline International, 2000-03-24) Gathungu,G.K.; Shibairo ,Solomon I.; Githiri, S.M.; Mburu, M.W.K.; Ojiambo, P.S.; Kidane Mariam, H.M.
Effects of phosphorous on growth and yield of snowpeas (pisum sativum var. oregon sugar pod ii)
(2015-07-31) Mburu, Mary W.K.; Njoroge, Patrick K.; Shibairo, Solomon I.; Githiri, S.M.
Two field experiments were carried out concurrently at the Faculty of Agriculture, Field station farm, University of Nairobi in March-July 2000 (season I) and June-September 2000 (season II) to determine the effect of application of different levels of phosphorous (P) fertilizer on growth and yield of snowpea (Pisum sativum L. var. Oregon sugar pod II). The experiments were laid out in a complete randomized block design with three replicates. Four levels of P (0, 57, 114 and 171 kg P2O5 ha-1) were applied as TSP (46% P2O5) at planting. Plant heights were measured at 31,38,45,58,71,84 and 97 DAS. Leaf area index and above- ground dry mass were determined at 29, 43, 63, 77 and 94 DAS. Harvesting of pods was done at 68, 72, 75, 79, 82, 86, 89, 93, 96 and 100 DAS. P fertilization resulted in significant (P  0.05) increases in plant height, leaf area index, and total above ground dry matter accumulation in both seasons. Number of pods plant-1 showed a quadratic trend with increasing P at 68, 89 and 93 DAS in season I. Linear and quadratic increases in number of pods plant-1 were observed at 96 DAS and on total number of pods plant-1. At 100 DAS, only linear increase was observed. Pod dry mass plant-1 showed a quadratic increase at 68, 89, 93 and 96 DAS. At 100 DAS, linear increase in pod dry mass plant-1 was observed. Linear and quadratic increases were observed in total pod dry mass plant-1. P application did not affect both the number of pods and pod dry mass plant-1 in season II probably because of the low amount of rainfall. Application of 57 kg P2O5 ha-1 resulted in dry pod yields of up to 9.75 tons ha-1 which is higher than the national dry mass averages of 5 to 6 tons ha-1. It is therefore recommended that judicious levels of P be applied for growth of snowpeas.
Effects of phosphorous on growth and yield of snowpeas (Pisum sativum var. oregon sugar pod II)
(2015-07-31) Kabui, Njoroge Patrick.; Shibairo, Solomon I.; Githiri, S.M.; Mburu, M.W.K.
Two field experiments were carried out concurrently at the Faculty of Agriculture, Field station farm, University of Nairobi in March-July 2000 (season I) and June-September 2000 (season II) to determine the effect of application of different levels of phosphorous (P) fertilizer on growth and yield of snowpea (Pisum sativum L. var. Oregon sugar pod II). The experiments were laid out in a complete randomized block design with three replicates. Four levels of P (0, 57, 114 and 171 kg P2O5 ha-1) were applied as TSP (46% P2O5) at planting. Plant heights were measured at 31,38,45,58,71,84 and 97 DAS. Leaf area index and above- ground dry mass were determined at 29, 43, 63, 77 and 94 DAS. Harvesting of pods was done at 68, 72, 75, 79, 82, 86, 89, 93, 96 and 100 DAindex, and total above ground dry matter accumulation in both seasons. Number of pods plant-1 showed a quadratic trend with increasing P at 68, 89 and 93 DAS in season I. Linear and quadratic increases in number of pods plant-1 were observed at 96 DAS and on total number of pods plant-1. At 100 DAS, only linear increase was observed. Pod dry mass plant-1 showed a quadratic increase at 68, 89, 93 and 96 DAS. At 100 DAS, linear increase in pod dry mass plant-1 was observed. Linear and quadratic increases were observed in total pod dry mass plant-1. P application did not affect both the number of pods and pod dry mass plant-1 in season II probably because of the low amount of rainfall. Application of 57 kg P2O5 ha-1 resulted in dry pod yields of up to 9.75 tons ha-1 which is higher than the national dry mass averages of 5 to 6 tons ha-1. It is therefore recommended that judicious levels of P be applied for growth of snowpeas. Keywords phoshorous, snowpeas, growth, yield
Pattern of origin of anterior inferior cerebellar artery in a black Kenyan population
(2014-09-02) Ogeng’o, Julius A.; Misiani, Musa; Olabu, Beda O.; Inyimili, Martin I.; Njoroge, P.K.; Shibairo, Solomon I.; Githiri, S.M.; Mburu, M.W.K.; Khaemba, B.M.; Ogenga-Latigo, M.W.; Mutinga, Mutuku J.
Background: Pattern of origin of anterior inferior artery is important in interpretation of posterior circulatory stroke and during posterior cranial fossa surgery for aneurysms, arteriovenous malformations, tumors, posterior cerebral revascularization, and in diagnostic as well as interventional neuroradiology. The pattern displays ethnic variation but data from African populations are scanty. This study therefore aimed to describe the pattern of origin of anterior cerebellar artery in a black Kenyan population. Materials and Methods: One hundred and seventy three [99 male: 74 female] basilar arteries from adult formalin fixed brains were studied at Department of Human Anatomy, University of Nairobi, Kenya. Site and pattern of origin of anterior inferior cerebellar arteries were recorded. Data were analyzed by SPSS version 17.0 for Windows, and presented in a table and macrographs. Results: Anterior inferior cerebellar artery arose directly from basilar artery in 138 (79.8%), as common trunk with labyrinthine artery in 24 (13.9%), from verterbral and labyrinthine arteries in 3% cases each. Conclusion: In about 14% cases, anterior inferior cerebellar and labyrinthine arteries arise as common trunks from basilar artery. These proportions differ with those in prevailing literature from Caucasian and oriental populations. Extra care should therefore be exercised during surgery and neuroradiology in the posterior cranial fossa, and in interpretation of signs of posterior circulation stroke. Pre-operative ultrasound evaluation of the vascular bed is recommended.