Novdan.Spraying of 0.05% concentration of Mn on Elymus sibiricus seed plot evidently decreased its seed germination rate and speed, but positively raised those of Agropyron desertorum cv.Nordan.

• 0.；05%25浓度的锰使老芒麦种子的发芽指数明显降低，而诺丹冰草种子的发芽势和发芽指数则明显提高；