烟台地区处于山东半岛东部,属海洋性气候,常年气温平均在13℃左右,年降雨量在700毫米左右,发展绿肥是很可能的。烟台地区冬闲地约占耕地面积的60％以上,冬闲地中大部分是山岭地,土地瘠薄,运粪困难,施肥较少,多为一年一作,产量很低,所以利用这些冬闲地栽培冬季绿肥,对提高本区单位面积产量和培养地力具有重要意义。我所于1962—1963年先后从西北、华北、淮北等地引进绿肥种类和品种56个,在本所试验场采用小区试验进行鉴定。鉴定结果,毛叶苕子耐寒性强,比较耐旱、耐瘠,利用冬闲地种植,不侵占粮、油作物生长季节,不影响作物播种面积,而且鲜草产量高,含氮量亦 Yantai is located in the eastern part of Shandong Peninsula. It belongs to the maritime climate. The average annual temperature is about 13 ℃ and the annual rainfall is about 700 mm. It is quite possible to develop green manures. Yantai winter fallow land accounts for more than 60% of the area, most of the winter fallow land is mountainous, barren land, difficult to transport, fertilization less, mostly for a year, the yield is very low, so the use of these winter fallow cultivation of winter Green manure, to improve the yield per unit area and cultivate the land is of great significance. From 1962 to 1963, I successively imported 56 types and varieties of green manure from northwest, north China and Huaibei, etc., and used community test to identify them in our test site. As a result, the cold-resistant chinense millet was more drought-resistant and barren-tolerant, and the winter fallow land was used for planting without interfering in the grain and oil crops. The planting season did not affect the sown area of ​​crops, and the yield of fresh grass and the nitrogen content