今年黔西县从玉屏县调入水稻V77种子39155公斤,播后约4万亩V77品种发生历史罕见的秧苗徒长现象,造成直接经济损失80万元,间接经济损失更大。其中旱秧徒长率高达90％以上,两段育秧30％～50％,水秧5％以下。现就引起大面积徒长的原因浅析如下: This year, Qianxi County transferred 39,155 kilograms of rice V77 seeds from Yuping County. After the sowing, about 40,000 hectares of V77 varieties experienced a rare history of seedling growth, resulting in a direct economic loss of 800,000 yuan and a greater indirect economic loss. Among them, the growth rate of drought-tolerant seedlings is as high as 90% or more, with 30% to 50% for two-stage seedlings growing and below 5% for water-seedlings. The reason for the large area growth is as follows: