Zobrazeno 1 - 10
of 43
pro vyhledávání: '"P. Okinda Owuor"'
Publikováno v:
International Journal of Plant & Soil Science. :124-137
Productivity of sugarcane in Kenya has declined despite use of recommended production practices including introduction of elite high yielding and early maturing sugarcane varieties. Farmers continue to use recommended agronomic inputs for the old low
Publikováno v:
Journal of Environmental Sciences. 96:178-185
The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SPMDs). The SPMDs were extracted by dialysis using n-hexane, followed by c
Publikováno v:
American Journal of Plant Sciences. :855-869
The tea crop provides income and employment to rural populations in many countries. In Kenya, tea, which is the leading export commodity crop, is grown in highlands east and west of the Rift Valley at altitudes ranging from 1300 m to 2700 m above mea
Publikováno v:
International Journal of Tea Science. 13
In Kenya, tea is grown in highlands east and west of the Rift Valley at altitudes ranging from 1300 m to 2700 m above mean sea level. These areas vary widely in seasonal and locational environmental factors leading to differences in responses in grow
Publikováno v:
International Journal of Tea Science. 13
Tea husbandry practices in Kenya are uniform despite variations in responses to agronomic inputs with locations. Nitrogen availability is the most limiting tea/crop growth factor. However, tea yields vary with region of production even with the same
Autor:
Evelyne Cheramgoi, Jenipher A. Odak, P. Okinda Owuor, Francis N. Wachira, Lawrence Onyango Arot Manguro
Publikováno v:
International Journal of Tea Science. 13
Nitrogen fertilisation influences tea yields, quality and pests infestation levels. Red spider mites reduce tea production in western Kenya during prolonged droughts. Nitrogen fertiliser use maybe an agronomic practice that may influence infestation
Autor:
P. Okinda Owuor, Martin Obanda
Publikováno v:
International Journal of Tea Science. 13
Long chemical wither durations and hard physical wither reduce the quality of plain black tea, through reduction in total theaflavins production while encouraging thearubigins formation. Such quality reduction may vary with genetic makeup of the tea
Publikováno v:
Toxicological & Environmental Chemistry. 97:51-61
Although use of pesticides is critical in agricultural production, their residues present a potential risk to non-target organisms and lower the quality of surface water. In Kenya for instance, widespread use of pesticides in the catchment of Lake Na
Autor:
Francis N. Wachira, Evelyn Cheramgoi, Lawrence Onyango Arot Manguro, P. Okinda Owuor, Jenipher A. Odak
Publikováno v:
International Journal of Tea Science.
Mites infestations reduce yields in tea production world wide. However, some tea cultivars are resistant/tolerant to mites attack. The resistance/susceptibility can also be influenced by abiotic factors. This study evaluated some new tea clones for m
Autor:
Martin Obanda, P. Okinda Owuor
Publikováno v:
International Journal of Tea Science.
Hard physical withers in tea processing result in reduced plain black tea quality parameters, but improve flavoury black tea quality. Chemical withers with minimal moisture loss improve plain black tea quality parameters. But chemical withered leaf i