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一、前言小麦的适宜播种期与品种、地区、地势、气温及土壤肥力等条件有着很大的关系。只有科学的掌握了小麦个体发育对外界环境条件的要求,才能作到适期下种。如我省渭北高塬地区近几年来由于品种改换,播种期掌握不当,因而加重了寒害。56年渭北高原区推广种植碧蚂1号小麦,群众没有依据品种特性适当迟播,结果该年小麦严重“冬旺”(有的拔节起身)而
I. INTRODUCTION Suitable sowing date of wheat has a great relationship with variety, area, topography, temperature and soil fertility. Only scientific grasp of the development of individual wheat on the external environmental conditions, can be made under the appropriate species. For example, in our province, the Weibei high-altitude area has aggravated the cold damage in recent years due to the variety change and improper sowing period. Weibei Plateau 56 years to promote the planting Bi Ma 1 wheat, the masses did not follow the characteristics of the appropriate late varieties of rice, the results of the serious wheat “winter wang ” (and some join up) and