High Altitude Ley Agronomy in Kenya Ii-The Effects of Phosphates and Nitrogen

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Birch W.R
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By W. R. Birch, Grassland Research Station, Molo, Kenya (Received for publication on 6th May, 1959) The first phase of the work at the Molo Grassland Station has been concerned largely with species and strains of grasses and legume5 suitable for leys, their establishment and their fertilizer requirements. Much of the work has therefore been done on a small plot basis and certain aspects of this work, particularly with fertilizers, is reported here. Other aspects, such as the weed problem of old arable land, have already been reported [1, 2] and will not be mentioned in any detail. The results that follow are based on experiments done at the Mob Grassland Station. Small plots of about 1/180 of an acre were generally used with three or four replications. As no facilities for dry matter determinations were then available, the results are generally based on weights of fresh material, taken by cutting with an Allen Scythe after suitable discards had been cut to avoid edge effects. Results expressed as fresh weights are open to many objections, but in this work only large differences between treatments are looked for as a guide for more precise work on a long-term basis later on. When legumes were used they were always inoculated with the appropriate inoculant, and high seed rates were often used to get a quick cover, and to reduce the necessity for hand weeding. Where super· phosphate was used, this was invariably triple superphosphate of 40 to 42 per cent PzO; content.
East African Agricultural And Forestry Journal, XXV (2), p. 113-120