棉 花 学 报 Cotton Science 2006，18(6)：332-337
Analyses on Growth Stages of Winter-season Cotton in Hainan Island Abstract：Natural growth stages of four planting procedures for 124 cotton accessions(Gossypium hirsutum ) were investigated in Hainan Island in winter of 2004 and 2005. The whole growth stages from planting to boll opening averaged with 132.75 days，which was not much different from those in cotton production belts in China(Mainland). It was evident that there was difference between whole growth stages among four planting procedures with the shortest of first planting procedure (October 1 to 2) and the longest of third planting procedure (November 16 to 20). Nearly 15 days differed from those two planting treatments. Whole growth stages of two types of cotton varieties with short and long seasons behaved remarkablely different in their original belts，but did not show any big difference (not over 5 days) in winter-season in Hainan Island. Both types of cotton varieties could mature naturally in mid April，even if planted in early December. Authors of this paper suggested，based on the experimental results，an U-growing pattern for winter-season cotton and a self-complementing mechanism may exist between cotton from the latest two planting procedures. According to the U-growing pattern，the authors pointed out that the reasonable planting dates should be in October for winter-season cotton aimed at both scientific research and industrialization，but it would be also okay to plant cotton in early December if it might be hurry to plant for saving seasons. It was critical to control cotton development during mid or little later growing season for the limited growth period.
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