(1)
Yihenew G. Selassie; Amnat Suwanarit; Chairerk Suwannarat; Ed Sarobol. Equations for Estimating Nitrogen Fertilizer Requirements from Soil Analysis for Maize (Zea Mays L.) Grown on Alfisols of Northwestern Ethiopia. Agr. Nat. Resour. 2003, 37, 157-167.