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Browsing Land by Subject "Acid soils"
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Item Management of Acid Soils in Central Kenya Highlands(2013) Kihanda, F.M.; Muriithi, C.; Mwangi, M.The Ando-humic Nitisols within the highlands of central Kenya are characterized by low soil pH, low exchangeable bases and high percent Aluminium saturation resulting in low maize yields. An experiment was conducted to determine the effect of NP fertilizers (0 or 50 kg N & P205/ha), K (0 or 50 kg K20/ha), agricul turallime (L) at 0 or 1.0 t/ha and farmyard manure (FYM) at 0 or 5.0 t/ ha on maize yield and soil chemical characteristics over a period of eight years. The treatments were arranged in a Randomised Complete Block Design replicated two times. There was no significant increase in maize yield due to K application. Lime increased the maize grain yield by 156 % whereas the application of either FYM or NP fertilizer resulted in similar increases in maize grain yield (90 %). The highest maize grain yield of 4.5 t/ha was obtained by a combination of NP, lime and FYM. The highest (1.4 %) loss in organic C of was observed in plots that had not received any NP fertilizer and FYM. Agricultural lime increased the soil pH from 4.4 to above 5.5 irrespective of the NP or FYM treatments. Aluminium saturation decreased to zero in the plots that had received lime. There was a large increase in soil exchangeable Ca when lime was applied.Item New aspects of the so-called acid Sands soils of southern Nigeria(1976) Unamba-Opara, I.Some chemical and physical properties of the acid sandy soils of Southern Nigeria were studied. There were differences among the soils as a result of varied stages of development and consequently degree of leaching. In these soils it was found that there were significant relationships between the C and N contents in the soil with the amounts of annual rainfall in an area, consequently there were positive correlations with soil properties that are dependent on precipitation.Item Relationship between Base Saturation and Crop Response to Phosphate in Acid Soils(1951) Birch, H.F.IN an attempt to relate phosphate responses in the field with soil analyses, the most significant correlations I have yet obtained have been between response and the percentage saturation of the base exchangecapacity.Item The Relationship between Phosphate Response and Base Saturation in Acid Soils(1952) Birch, H. F.; East African Agriculture and Forestry Research OrganizationThe object of the following investigation was to find a satisfactory soil test for assessing phosphate availability and response in some of the more important agricultural soils of East Africa. The method employed was to compare the amounts of the various soil constituents, singly and in combination, with crop yields and responses to phosphate in the field, in order to find the most significant correlations. The soils required for this study were obtained from a large number of fertilizer trials, on various soil types, in Kenya, Uganda and Tanganyika. The trials were mainly concerned with the responses shown by wheat, maize, grass and millet.Item The relationship In acid soils between base saturation and phosphorus uptake by grasses(1953) Birch, H.F.; East African Agriculture and Forestry Research Organization, Kikuyu, KenyaThe important role played by the degree of base saturation in governing phosphate availability and response in acid soils has already been described (Birch, 1952). Since grass samples were available from seventeen of the nineteen established grass experiments it was decided to analyze these for phosphate to determine the extent to which the amount of phosphate in the grass was dependent on the degree of base saturation of the soil and on the amounts of the various forms of phosphate in the soil.Item Soil Silica and Phosphorus Response by Maize in Acid East African Soils(1970) Garberg, P. K.; East African Agricultural and Forestry Research Organisation, Muguga, KenyaWater-soluble soil silica values are inversely related to maize responses to phosphorus fertilizer.
