Evaluating the sensitivity of yield and water productivity of wheat to applied water and nitrogen fertilizer

Abstract
The objective of the present study was to evaluate the sensitivity of yield and water productivity of wheat crop to the combined effects of applied water and N fertilizer. Field trials were conducted at the Experimental Field of Agricultural College of Aboureyhan, University of Tehran, during three irrigation seasons. The experimental design was a randomized complete block with four replicates. The main plot consisted of four levels of applied water and the sub-plot consisted of three levels of N application. The results of the statistical analysis of variance showed that there was a statistical difference among different treatments of applied water and grain yield at P