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一、引言马铃薯进入块茎膨大阶段,单株块茎数基本稳定。此时,单株块茎数的重量,已成为产量构成的主要因素,而块茎重量的增加,主要受土壤温、湿度的制约。我省海拔2800米以上的高寒地区,年平均气温0～2℃,≥℃的积温1500左右,年降水量500毫米以上。这类地区的马铃薯,常常因热量不足、低温、水浸等不利因素的影响,单产低而不稳。近几年推广
First, the introduction of tubers into tuberosity stage, the number of single tuber stable. At this point, the weight of tubers per plant has become a major factor in the yield composition, while the increase in tuber weight is mainly due to soil temperature and humidity constraints. In the alpine region above 2800 meters above sea level in our province, the annual average temperature is 0 ~ 2 ℃, the accumulated temperature ≥ 1500 ℃, and the annual precipitation is more than 500 mm. Potatoes in these areas are often low and unstable due to unfavorable factors such as insufficient heat, cold temperatures and flooding. In recent years to promote