晋薯9号马铃薯结薯规律的研究

经三年的试验资料表明，晋薯９号马铃薯的结薯规律，与地上部生长有着密切的关系。如株高生长最快时期是在块茎膨大盛期前夕；分枝生长最快时期是在花期左右，与块茎膨大盛期同步。复叶生长最快时期是和匍匐茎发生与生长同时进行。当植株茎叶鲜重生长进入高峰时期，块茎也进入膨大盛期。匍匐茎的发生是伴随着根和芽的生长而发生。在幼苗期考察，已有匍匐茎３～５条，出苗３０ｄ后基本全部形成，约７条左右。现蕾期后一周，匍匐茎顶端形成小块茎，单株出现１０～５０ｇ块茎，即块茎形成期。出苗后４０ｄ左右，正是初花，单株出现５０～１００ｇ块茎，地下部块茎进入膨大期。当株高、茎叶鲜重达到全生育期最大值时，单株出现１００ｇ以上块茎，当时正是花期后的两周，即出苗后６０ｄ左右，单株块茎日增量增至１８～２７ｇ，块茎进入膨大盛期。

A STUDY ON PATTERN OF TUBER FORMATION OF VARIETY JINSHU NO.9

Results based on 3-year studies indicated that there were close relationships between tuber formation and aerial growth of Jinshu NO.9.For plant height,the fast growth period was earlier than tuber expansion.For branches,it was at flowering stage,when it was in tuber expansion stage.For leaves,it was simultaneous with stolon growth.The peak peried of aerial growth was also the full expansion period of tuber. The growth of under ground parts depended on basis of aerial growth.The stolon development followed root and shoot growth.At seedling stage,there were 3～5 stolons.Before flowering(30 days after seedling emergence),all stolons were formed,reaching about 7.A week after flower bud formation,young tubers about 10～50g for individual plant appeared at the top of stolon.At initial stage of flowering (about 40 days after seedling emergence ),tuber got into expansion stage and tubers weighed about 50～100g for individual plant.Two weeks after flowering (about 60 days after seedling emergence ),the weight of tuber was over 100g, increasing with 18～27g daily gain.This period was full expansion stage. 〖WT5HZ]