Sudan grass variety Sirius (Sorghum sudanense (Piper) Stapf).
This Romanian synthetic variety, composed of 4 inbred lines derived from Chernomorka, Sudanul Dulce [Sweet Sudan] and Green Leaf with 2 cycles of selection for resistance to Helminthosporium sativum [Cochliobolus sativus] and Hadrotrichum sorghi foliar diseases and good regrowth capacity after cutting, has a high coefficient of digestibility and a low content of HCN at the seedling stage. It has a good capacity for forming new growth from the second to fourth cuts. Sirius is 5 days earlier than Sudanul Dulce and has a dry matter content of 17.4% vs. 15.6% in Sudanul Dulce. Its mean green matter yield is 106.2 t/ha vs. 99.9 t/ha for Sudanul Dulce. As a second crop it can yield 57.5 t green matter/ha.