J. DeckersNational Fertilizer and Inputs Unit
FAO/MOA/ADD, Addis Ababa, Ethiopia
Since 1986 responses of food crop yields to N and P fertilizers have been investigated in the National Trials Programme of the Ministry of Agriculture in Ethiopia. Some early findings of the 1986 trials on Vertisols are reported for Bichena, Goro and Degolo sites, using wheat and teff as test crops.
The soil fertility requirements of Vertisols are crop specific and vary with location. In this paper the results of investigations on the N and P requirements of wheat in the presence and absence of farmyard manure (10 t ha-1) are presented. The response of teff to combinations of slow-release phosphate and triple superphosphate is also discussed.
