Breeding Report on the New Forage Sorghum Variety Longcao 4
With the development of herbivorous animal husbandry,forage sorghum has played an important role in adjusting the agricultural industrial structure,developing herbivorous livestock,and improving and protecting the ecology in the northwest region of China.To cultivate high-quality,high-yield,and stress-resistant new varieties of forage sorghum suitable for different ecological regions in Gansu,the Crop Research Institute of the Gansu Academy of Agricultural Sciences used the A6Tx398A cytoplasmic male sterile line as the maternal parent and the excellent restoring line F11,obtained by crossing Sudan grass Loulan 1 with sweet sorghum MONSTER,as the paternal parent to create hybrid combinations.After several years of breeding,the new forage sorghum variety Longcao 4 was developed.From 2021 to 2022,it participated in multiple regional experiment in Gansu Province,yielding an average biological yield of 103,647.6 kg/ha,which was 10.6％higher over the control variety Longcao 1.In 2022,it participated in production experiment,achieving an average biological yield of 106,758.5 kg/ha,a 6.0％increase compared to the control Longcao1.The grain contains 68.0 g/kg crude protein,76.0 g/kg crude ash,43.0 g/kg lignin,559 g/kg neutral detergent fiber,366 g/kg acid detergent fiber,and 283 g/kg dry matter,with a cyanide content of 8.32 mg/kg.This variety exhibits strong regeneration ability,rapid growth,and tender stems and leaves,making it suitable for promotion and planting in arid and semi-arid ecological areas such as Jiuquan,Jinchang,Wuwei,Lanzhou,Pingliang,and Qingyang in Gansu Province.
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