Influence of Nitrogen Fertilizer and Planting Date on Grain Yield and Some Morpho-physiological Traits in Four Wheat Varieties under Rainfed Conditions

Gada Damen Janoud, Ayman Shehada ALـ Ouda, Hessian ALـ Mahasna

Abstract


A field experiment was conducted in Izra’a Research Station, Dara,a governate, Syria, during the two growing seasons (2010/2011-2011/ 2012), in order to study the influence of nitrogen fertilizer and planting date on grain yield and some morpho-physiological traits in two duram wheat varieties (Dumma1, Dumma3), and two bread wheat varieties (Dumma2, Dumma4) under rainfed conditions. Results indicated that the ratio of stay green, water use efficiency and grain yield traits were significantly higher during the first more rainfall growing season (40-50%, 10.90 Kg. ha-1.mm-1, 3.28 ton. ha-1 respectively), in the variety Dumma4 (40-50%, 10.62 kg. ha-1.mm-1, 3.39 ton. ha-1 respectively), for the very early planting date (40-50%, 11.36 kg. ha-1.mm-1, 3.48 ton. ha-1 respectively), at the nitrogen rate of 200 kg N. ha1- (40-50%, 10.49 Kg. ha-1.mm-1, 3.31 ton. ha-1 respectively), when the nitrogen fertilizer was applied at two splits (40-50%, 9.111 Kg. ha-1.mm-1, 2.88 ton. ha-1 respectively). The epiculticular wax deposits and leaf relative water content were significantly higher during the second drier growing season in the variety Dumma1, at the very late planting date, at the nitrogen rate of 200 Kg N. ha1-, when the nitrogen fertilizer was applied at two splits (1.07 mg. cm-2, 91.07% respectively). These results indicate the importance of optimization of agricultural practices for improving the adaptive capacity of wheat varieties and their production capacity under rainfed conditions.

Keywords


Water use efficiency, Relative water content, Rainfed, Adaptive capacity Wheat

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