Varietal variations of sesame in nitrogen utilization efficacy

الملخص EN

From an eco–economic perspective, the effi-cient use of nitrogen is becoming incrementally worthwhile in crop management.

Therefore, growth, yield and seed yield response index of three sesame varieties (Shandwel–1, Giza–32 and Sohag–1) as affected by four N rates (0, 72, 108 and 144 kg N ha−1) were investigated during two seasons of 2013 and 2014.

The study illustrated that Sohag–1 was the superior variety for achiev-ing SPAD value and seed yield ha−1.

Sesame plants can be fertilized with N at a rate of 108 kg ha−1 being recorded higher seed yield ha−1.

Inte-gration between proper variety as a genetic factor with the appropriate N rate applied as an environ-mental one, i.e.

Sohag–1 x 108 kg N ha−1 (or So-hag–1 x 144 kg N ha−1) considered a marked prac-tice for gaining high sesame seed yield as an eco-nomic product.

Being Sohag–1 exhibited less re-duction in yield under low N rate and highly re-sponse with high N applied it belongs to ER group