1. Soil Fertility Status and Fertilizer Recommendation Atlas for Tigray Regional State, Ethiopia, Addis Ababa, Ethiopia,2014
2. Soil Fertility Ftatus and Fertilizer Recommendation Atlas of Amhara National Regional State, Ethiopia, Addis Ababa, Ethiopia,2016
3. Sustainable management of potassium;Askegaard,2004
4. Participatory on-farm conservation tillage trial in Ethiopian highland Vertisols: the impact of potassium application on crop yield;Astatke;Exp. Agric.,2004
5. Fertilization with potassium in crops under no-tillage in Uruguay: yield response based on soil testing;Barbazán;Agrociencia,2011