دور بعض الممارسات الزراعية في زيادة كفاءة استعمال الآزوت و تحسين الخصائص النوعية لدى بعض أصناف القمح المزروعة بعلا

الملخص EN

A field trail was conducted at Jeleen Research Station, Dara, a governorate, Syria, during two consecutive growing seasons (2010/ 2011-2011/ 2012), in order to evaluate the role of some cultural practices in improving nitrogen use efficiency and grains quality characteristics of four wheat varieties (Acsad1105, Acsad1229, Acsad885 and Acsad901).

The experiment was laid according to randomized complete block design-split, with three replicates.

Leaf area index, grain starch content and grain yield were significantly higher during the first growing season, in the wheat variety (Acsad901), for the first planting date, and nitrogen rate (200 Kg N.

ha1-), when nitrogen fertilizer was added in two splits (1.25, 68.60 %, 1051 g.

m-2).

Nitrogen use efficiency was significantly higher at the nitrogen rate (100 Kg N.

ha-1) and the same previous variables (74.99 %).

Grain protein content was significantly higher during the first growing season, in the two durum wheat varieties (Acsad1105, Acsad1229), for the third planting date, and nitrogen rate (150 Kg N.

ha1-), when it was applied in three splits (17.8, 17.7 %).

Results indicated that the importance of optimizing the cultural practices to improve the quantitative and qualitative characteristics of both soft and durum wheat varieties under water-limited conditions.