三樱椒是拓城县的主要农作物，年产值上亿元。多年种植三樱椒的实践证明，提早育苗、科学管理是三樱椒优质高产的关键。1育苗育苗的目的是延长三樱椒的生长期。为了提早育苗，多采用阳畦、塑料薄膜覆盖等措施来达到籽粒发芽的温度标准。根据拓城县的气候条件，育苗时间应?.. Three cherry is the main crop extension County, the annual output value of 100 million yuan. Three years of planting three cherry pepper proved that early nursery, scientific management is the key to high quality and high yield of three cherry. A nursery nursery The purpose is to extend the life of three prickly ash. In order to early nursery, the use of more Yang Yang, plastic film covering measures to achieve the temperature of grain germination standards. According to the climatic conditions in Tucheng County, the breeding time should be?