玉米杂交新品种在农业生产中已越来越被人们所认识，种植推广玉米杂交新品种，应遵循三个原则：一、坚持因地制宜的原则育种单位育成的某个新品种，不是任何一个地方都能种植的，所以在选用和推广前，（一）要看这个品种生长发育所需的积温，是否与当地的积温接近；（二）要看 New varieties of maize hybrids have become more and more recognized in agricultural production. Planting and popularizing new varieties of maize hybrids should follow three principles: First, adhere to the principle of local conditions Breeding units of a new breed, not anywhere Can be planted, so before the selection and promotion, (a) depends on the variety of growth and development required for the accumulated temperature, is close to the local accumulated temperature; (b) depends on