Fertilizer Trials on Maize and Wheat

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Weis, E.A
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varying ratios of N-P in the seedbed investigated. It would appear that this ratio is more critical for wheat than maize and too close a ratio may depress yields.The effect of wattle on following crops is discussed in some detail. Applications of nitrogenous fertilizers to crops in the year following wattle generally depressed yields, both as a seedbed application and as a top-dressing. The "brushwood line" effect is described, with the probable reasons for improved plant growth on these areas. Nitrogen top-dressing of maize is essential for maximum yields on all soil types but the optimum amount varies. It would appear that even distribution of the fertilizer is more important than the method of application.Mechanical spreading was effective and speedy. Top-dressing of wheat was uneconomic except in certain restricted circumstances. Seedbed applications of magnesium sulphate to acid volcanic soils in the Nandi Border area increased yields, the increase being greater in the presence of seedbed nitrogen. Liming also increased yields on these soils, but the amounts required made its use unprofitable and on other soil types may have little effect on crop yields. Potash generally depressed yields and no other fertilizer had any significant effect. Foliar nutrient sprays had little effect on below average crops of both wheat and maize.
East African Agricultural And Forestry Journal, XXXII (3), pp. 326-340