The study of Reyan No.4 king grass's seed stem (root) that living through the winter indicated that the rate of natural seed keeping could reach 75%～95% in the -1℃～2℃ areas, and protected the seed safely, but it was frozen to death when the temperature was -4℃, unable to live through the winter and keep the seed naturally.However, if taking artificial measure to keep it warm, the rate could reach 90%, bringing hope to those lower temperature areas.

川东鸭茅(Dactylis glomerata L.cv.Chuandong)由达县野生鸭茅经多年混合选择选育而成,经全国牧草饲料作物品种审定委员会审定通过,品种登记号262.川东鸭茅为多年生疏丛型直立禾草,须根系,无主根,根系发达;株高90～140cm,基部数节长出分枝,茎秆分为生殖枝和营养枝;叶量丰富柔嫩,叶长36～38cm,宽0.9～1.3cm;圆锥花序,异花授粉;种子长5～6mm,中宽0.6mm,千粒重1.00～1.32g,种子落粒性较强易收种.