1999年 4月初和棉花吐絮期雨水较多 ,推迟了收获期 ,棉花的等级下降了 ,与过去的三年比较 ,差异主要表现在色度和叶级上 ,但其它主要参数还不错。棉花等级达到中级或更高的占总数的 64% ,低于前三年的平均值 77% ;1 998/99年度主体长度达到 37mm的占 47% ,前三年平均为46% ;麦 At the beginning of April 1999 and in the cotton boll opening period, there was more rainwater and postponed the harvesting period. The cotton grade dropped. Compared with the past three years, the difference mainly reflected in the chromaticity and leaf level, but other major parameters were not bad. The cotton grade reached 64% of the total, which was lower than the average of the previous three years by 77%; 47% of the main body length reached 37mm in 1998/99, an average of 46% in the previous three years;