Browsing by Author "Griffith, G."
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Item Fertilizer studies on Uganda soils(1949) Manning H. L.; Griffith, G.; Department of Agriculture, UgandaExperiments conducted over several years and with various crops have shown that primary expectations of large yield responses to fertilizers have not been fulfilled. More detailed and necessarily slower work, which must now follow, may lead to larger yield responses. Foremost among the new series of experiments are the investigations regarding the source,duration and magnitude of accumulated nitrate nitrogen.Routine experiments have clearly shown that no spectacular yield responses are likely to be obtained except on soils of known low nutrient status. Stress must now be laid on the necessity for patient and detailed work along lines which these trials have indicated. Fundamental problems such as nitrate accumullation, phosphate fixation under these conditions, and potash requirements under various intensities of solar radiation must be solved. Even where these are solved, the question of time and method of applying proven fertilizers present important problems. These recommendations applied later when improved cultural practices and other major improvements have been achieved would no doubt become of real value to the territory.Item Nitrate content of soil under pennisetum purpureum(1949) Griffith, G.; Department of Agriculture UgandaThe date on which nitrate content in the planted strip passed its maximum coincided approximately with the establishment of a complete 'ground cover by the cotton and coincided approximately also with the flowering peak of the cotton, a time when the cotton plant may be expected to begin its maximum demand on the soil nitrates.Item A Note on Termite Hills(1938) Griffith, G.In the drier areas the soil is lighter and less compact and a mound with less steeply sloping sides is formed. The typical appearance of the countryside is that of stunted and sparse tree growth with ample scope for wind action in the open spaces which are inadequately protected by grass, etc. The termite mounds here tend to provide a resting place for the organic residues blown from the open tracts. Bird and animal droppings and seeds are not so rapidly washed away. These factors give vegetation on the mounds a slight initial advantage which once cover is established, is of course cumulative. Finally the slightly raised situation gives the vegetation some immunity from fire.Item A note on the Nitrate Content of soil under pennisetum purpureum(1948) Griffith, G.Under Ugandan conditions two important effects of the(Pennisetum purpureum)fallow are noted ,firstly that the land newly opened from elephant grass must be left for several weeks before successful planting of a crop can be undertaken and secondly that when the grass is grown in strips a marked adverse edge effect shown itself for several fact into the neighbouring crop.
