适期播种,是紫云英鮮草丰产的主要技术措施之一。为了达到紫云英适期播种,浙江省連作稻和单季晚稻地区,通常均于晚稻收获以前在水稻株行間进行套种。但是在有些情况下,例如晚稻发生了倒伏,或者是某些稻田排水不良,需要在晚稻收后才能設法排水时, Appropriate sowing, is one of the main technical measures of high yield of fresh milkweed. In order to achieve proper sowing of Astragalus sinicus, continuous cropping of rice and continuous cropping of late rice in Zhejiang Province are usually interplanting rice lines before harvesting of late rice. However, in some cases, such as the lodging of late rice, or the poor drainage of some paddy fields, which need to be managed after the late rice harvest,