胡萝卜在我国大部分地区多作秋冬栽培 ,山东省也以秋作为主。其生长季节的气温由高到低 ,在较冷凉的气候条件下形成肉质根 ,贮藏养分 ,冬春季上市供应。而进行春播反季节栽培 ,往往抽薹多 ,产量低而不稳 ,商品质量不高 ,满足不了国际国内市场的需求 ,经济价值低。我们于1 998年 Carrots are mostly made in autumn and winter cultivation in most parts of our country, while autumn in Shandong Province is the mainstay. Its growing season, the temperature from high to low, in the cooler climate, the formation of fleshy roots, storage of nutrients, winter supply market. However, the cultivation of spring seasons is often carried out in seasons. Bolls are often sprouted and the yield is low and unsteady. The quality of the products is not high enough to meet the needs of the international and domestic markets with low economic value. We are in 1998