Browsing by Author "Harrington, G. N."
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Item A Comparison Of Controlled Grazing And Manual Hoeing As A Means Of Reducing The Incidence Of Cymbopogon Afronardus Stapf In Ankole Pastures, Uganda(1969) Harrington, G. N.; Thornton, D. D.Approximately 9,000 square kilometres (3,500 square miles) of east Ankole District, Uganda, are potentially highly productive grasslands. The area, at a general altitude of 1,225 to 1,525 m. (4,000-5,000 ft.) is one of undulating hills rising 100-200 m. above broad, flat valleys.Item The Effect of Foliar Spraying of Acacia Hockii De Wild with Picloram and 2, 4-D/Picloram Mixtures and Additional Treatment With Picloram Granules(1972) Harrington, G. N.Picloram was applied to Acacia hockii de Wild bushes (1,900 bushes per ha.) as a spray delivered both aerially to half ha. plots and to individual bushes. The spraying took place in February, August, September and October,1968, which were months previously found most effective. The arboricides used were Tordon 22K (24 per cent picloram a.e.), Tordon 01 (24% 2 4-D a.e. and 6% picloram a.e.) and Tordon 10K granules (10% picloram a.e.). Both solutions used were diluted to and 5% picloram a.e. The "aerial" spraying delivered 0.6 kg. and 3.0 kg. picloram a.e. per ha. and the ground spraying delivered 2.5 g. and 12.5g. picloram a.e. per bush using 1 and 5% solutions respectively. The "aerial" spraying was a failure and it is concluded that it is not possible to deliver sufficient picloram to kill A. hockii bushes economically by this means. The ground spraying only achieved 70% kill or more at the higher concentration of picloram solution. This was inferior to previous trials and it is concluded that moisture stress was inhibiting picloram translocation. The addition of 3g. a.e. per bush in granular form improved kill but not sufficiently to warrant the expense.Pre-burning of treated areas did not seem to affect the results and made the movement of spraying teams much easier. The use of a mixture of 2, 4-D and picloram depressed the amount of kill compared to that achieved with picloram alone, even when the solutions used contained the same amount of picloram.Item Journal Brief(1973) Harrington, G. N.In livestock production development areas in Uganda, efforts are made to control or eliminate grass fires, with the main intention of preserving the standing crop for cattle utilization. Investigations at Muko Range Experimental Station, Ankole, Uganda reveals no advantage to the cattle in burning off the dry grass and utilizing the regrowth. In fact, on such young grass, the cattle showed a requirement for roughage (unpublished data). It is often noticed that, with the cessation of burning, comes a great increase in the amount of woody vegetation (West, 1968), although this is not invariable. The density of Acacia hockii de Wild can be over 4,000 per ha. under an annual burning regime (Harrington, 1973b), most of which are plants of <0.5 m. When burning is prevented these plants can develop rapidly into thicket which is difficult to penetrate. Photographs of the problem in Ankole are shown in Harrington (1973a). Such scenes are a severe worry to graziers and government officials, concerned with livestock production and, in Uganda, bush control trials have been conducted for more than 15 years. Relative success against A. hockii has been reported by Harrington (1973a) using a picloram/2, 4 – D formulation, but early indications of the effect on cattle growth rates have not been maintained, which calls for this note of caution.Item Seasonal Crude Protein Content of Samples Obtained From a Tropical Range Pasture Using Oesophageal Fistulated Steers(1972) Dradu, E. A. A.; Harrington, G. N.Four mature oesophageal fistulated Ankole steers were used to sample range pasture at monthly intervals from August 1966 to July 1967 at 08.00, 11,00, 14.00 and 17.00 hours. Data presented demonstrated that there was no significant difference in the crude protein content of the samples attributable to the steers or to the time of day of sampling. Differences in crude protein content of the samples collected in different months were highly significant.
