چكيده لاتين :
Fertilizer Use Efficiency (FUE) is one way of improving the fertilizer management in agriculture. In this study, spinach (Spinacea Oleracea) was used as a case study vegetable to determine its nitrogen use efficiency in Varamin, Iran. An experiment was conducted using split plot design with three replications. Treatments included of five levels of N as 0, 150, 200, 250 and 300 kg ha-1 and five levels of phosphate as 0, 37.5, 50, 62.5 and 75 kg P2O5ha-1. Both fresh weight and nitrate content of leaf were measured. The optimum value of FUE obtained by applying 250 kg Nha-1.
