Comparisons Nitrogen Use Efficiency in Chickpea under Different Tillage Systems and Soil Residual Nitrogen

Abstract

This research was conducted with two years (2012/2013-2014/2015) period at research field of Faculty of Agriculture, Eskisehir Osmangazi University, Eskisehir, Turkey. Main plots were composed to conventional (CT) and reduced tillage (RT). Wheat-wheat (WW); wheat-fallow (WF); wheat-chickpea (WC) crop rotations were placed in sub plots, and four nitrogen doses (0, 50, 100, 150 kg ha-1) were evaluated as sub-sub plots. All of the traits except for grain yield were significantly affected by years. The reason for differences between years may be ecological conditions, cultural practices and soil conditions. Plant protein ratio, plant N ratio and nitrogen utilization efficiency (NUtE) were higher RT than CT but nitrogen use efficiency (NUE) and nitrogen uptake efficiency (NUpE) were higher CT than RT. Increasing nitrogen doses were not affected the plant protein ratio and plant N ratio as expected. The reason of this, the nitrogen doses were applied to the pre-plant instead of chickpea and the nitrogen might be lost by washing in the long period. NUE and NUpE decreased by increasing nitrogen doses but NUtE increased.