Browsing by Author "Othieno, C.O."
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Item Effect of Different Mulches on Soil Fertility and Nutrient Uptake by Tea in Kenya(1978) Othieno, C.O.; Tea Research Institute of East AfricaThe effect of different types of mulches on soil fertility and nutrient uptake by tea plants Camellia sinensis , was investigated in two field experiments in Kenya. The grass mulches of Eragrostis curvula, Napier and Guatemala maintained or increased levels of soil nitrogen, phosphorus and potassium. However, these mulches had different effect on the uptake of these nutrients. Where-as all the grass mulches increased the uptake of N and P, only the Napier grass significantly increased the uptake of K but in both experiments E. curvlila mulch had a depressing effect on the uptake of K. The increased uptake of nutrients, particularly N and P, was attributed to the addition of these elements in the soil by the mulches, prevention of their losses by erosion and profuse feeder root growth observed near the surface which was induced by the mulches.Item Nitrate Reductase Activity as a Selection Criterion On Tea(1989) Owuor, P.O.; Njuguna, C.K.; Othieno, C.O.Different tea clones exhibited significant variations in their yields and nitrate reductase activities(NRA), with younger leaves having higher NRA than the older mature ones. A stronger correlation existed between yield and NRA irrespective of the age as long as the leaves of the same age exist were used consistently. Nitrate reductase activity varied with age after planting and time of day. Thus to be used as a clonal selection criterion, plants must be of the same age, from one field and sampling must be done at the same time.
