The effects of DAP fertilizer on wheat yield in Uasin Gishu District of Kenya
Ogola, A.H. (National Plant Breeding Research Center (NPBRC), Njoro (Kenya)) | Oduor, P.O.S. (N.A.R.L., Nairobi (Kenya))
Diammonium phosphate (DAP) fertilizer has been suspected as a cause of low wheat yields in Uasin Gishu District due to its soil acidification property. Therefore, a study to determine the effects of DAP on grain yield and on soil properties was carried out on a farmer's field in Uasin Gishu. The treatments applied included combinations of two levels of DAP (100 and 200 kg/ha), two soil ameliorants (lime at 1 t/ha and manure at 5 t/ha wet weight), two levels of the non-acidifying fertilizer TSP (100 and 200 kg/ha), and Minjingu rock phosphate (10 t/ha). The combination of 100 kg/ha of DAP and 1 t/ha of lime significantly increased wheat grain yield. Manure or rock phosphate applied separately had negative but non-significant effects on grain yield; lime or TSP alone had no significant effect on grain yield. Application of DAP alone did not alter soil pH. However, DAP in combination with soil ameliorants increased both soil pH and exchangeable base levels
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