摘要： 研究了麦后夏播棉的促早避霜技术.麦后夏播棉有效开花结铃期短而集中,总结铃数的73.3%～88.9%集中在7月31日～8月14日之间.山西南部适宜种植的密度为12万～1万株/hm2.筛选出运379(3)h、晋棉17号等早熟品种.喷施避霜剂(壮早丰),可以降低株高,塑造理想株型,促进早熟,皮棉增产9.74%.麦后夏播棉避霜技术应采用早熟品种、早播种、早施肥、早灌水、高密度、早打顶、喷施壮早丰和乙烯利,及早防治病虫害的技术体系.

关键词: 夏播, 棉花, 避霜, 促早技术

Abstract: The ex periments were conducted f rom 1991-1999 to study the premature and f rost-avoiding techniques of summer cotto n w hich is planted af ter w inter w heat or rape harvest in May o r June .Yun 379(3)and Jinmian No .17 of premature co tton variet ies were selected .Flow ering and bolling period of summer cot ton is shorter and more concentrated .73.3 %-88.9 % of bolls are formed from July 31 to Aug .14 .Their planting density are 12 ×10 4-15 ×10 4 plants/ha in southern Shanxi .Application of Zhuang-zao-feng , a f rost-avoiding agent , will lower plant height , form compact plant type , accelerate co tton premature and make lint yield increased by 9.74 %.In o rder to prevent cot ton f rom f rostbite , premature technique system are taken such as earliness variety , early sow ing , fertilizer address , i rrigation , hig h planting density , early t ip pruning , spraying frost-avoiding agent and ethephon diseases and insects cont rol .

Key words: Summer seeding , Cot ton , Frost-avoiding , Earliness integrated techniques

中图分类号: 

• SS62