Browsing by Author "Stobbs, T. H."
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Item Animal Production from Hyparrhenia Grassland Oversown With Stlyosanthes Gracilis.(1969) Stobbs, T. H.The value of over sowing natural grassland with Stylosanthes gracilis was investigated with and without top dressing of single super-phosphate. Over a period of 30 months animal production was significantly higher on the fertilized pastures, averaging 423 lb live-weight gain per acre (474 kg/ha) per annum compared with 249 lb live-weight gain per acre (279 kg/ha) per annum from the unfertilized pastures. Single super-phosphate increased herbage yields mainly by encouraging more vigorous growth of Stylo plants, which suppressed the Imperata cylindrica content of the sward and increased the proportion of other valuable grasses. The quality of herbage on fertilized plots was significantly higher. The practical application of these findings is discussed.Item The effect of grazing resting land upon subsequent arable crop yields(1969) Stobbs, T. H.The effect of grazing a ley upon the yield of subsequent arable crops is investigated in a long-term 'trial at Ngetta Experiment Station, N. Uganda. The results show that three years of intensive day grazing significantly increased the yields of the following test crops compared with .the yields from ungrazed areas. Night paddocked plots consistently produced the greatest yields of subsequent arable crops, most probably due to an accumulation of excreta. The practical application of these findings are discussed.Item The Influence of Inorganic Fertilizers upon the Adaptation, Persistency and Production of Grass and Grass/Legume Swards in Eastern Uganda(1969) Stobbs, T. H.A classification of vegetation in Uganda (Langdale-Brown et al. (1964)) shows that there is a wide range of ecological types within the country. These variations have evolved as a result of human activity (grazing, burning, shifting cultivation and selective cutting) superimposed on the effects of climate, soil and wild fauna (Pratt et al. (1966». A study of the occurrence and behaviour of plants in their natural environment shows that various species adapt to different levels of soil fertility (Thomas (1940) and generally the most valuable pasture species are those 'to be found on the more fertile soils.Item The Introduction of Boran Cattle Into An E.C.F. Endemic Area(1966) Stobbs, T.H.; Stobbs, T. H.In 1958 it was realized that the Serere Research Station cattle br,eeding programme, which relied entirely on local small East African Zebu stock, was a long-term project. It was, therefore, considered desirable to find out if any of the exi:.ting improved breeds of beef or dual-purpose cattle could be adapted to the local conditions more rapidly than the indigenous cattle could be brought up to their standards, by selection. Boran cattle were chosen for the initial investigation because of their excellent record for beef production under difficult conditions in Kenya and their known adaptability to a wide range of climatic conditions. The final determining factor was their rdative availability in comparison with other breeds.Item The Value of Centrosema Pubescens (Benth.) For Increasing Animal Production and Improving Soil Fertility in Northern Uganda(1969) Stobbs, T. H.The Value Of Including Centrosema Pubescens In Pasture Mixtures, As A Means Of Increasing Animal Production And Improving Soil Fertility, Was Investigated In Northern Uganda. Over A Period Of 30 Months Animal Production Was Significantly Higher Where The Grass-Legume Pastures Were Top Dressed With Single Superphosphate, Averaging 374 Lb. Live weight Gain Per Acre (419 Kg./Ha.) Per Annum As Compared With 308 Lb. (345 Kg. / Ha.) Per Annum from the Unfertilized Pasture. The Plots Receiving Single Superphosphate Had Top Soil Significantly Higher In both Total Nitrogen and Available Phosphorous and Produced Substantial Increases in Subsequent Arable Crop Yields,
