s:265:"%T Wheat nutrient response functions for the East Africa highlands %A Cyamweshi R A %A Nabahungu N L %A Senkoro C J %A Kibunja C %A Mukuralinda A %A Kaizzi K C %A Mvuyekure S M %A Kayumba J %A Ndungu-Magiroi K W %A Koech M N %A Wortmann C S ";