苦豆子为豆科槐属多年生草本野生植物,学名是Sophora alopeuroides linn。陕北湖盆滩地区普遍生长,在新疆、内蒙、甘肃、宁夏等省、区荒沙滩上生长也较繁茂。它的抗寒、抗旱力很强,并耐碱湿,喜于在阳光充足、排水良好的石灰性土壤或沙丘上生长,也常入农田,易和牛心卜、沙柳、芨芨草构成植被区,在林区则易形成单纯的小群落。在陕北,苦豆子于4月初返青,5月下旬开淡黄色蝶形花,6月中旬为盛花期,7月结长荚果,8月底9月初果实全部成熟,种子和根均能繁殖。苦豆子作绿肥,资源丰富,肥效高,见效快,用 Sophora alopecuroides Sophora perennial herbaceous wild plants, scientific name is Sophora alopeuroides linn. Banhu Beach in northern Shaanxi generally grow in Xinjiang, Inner Mongolia, Gansu, Ningxia and other provinces, wilderness sandy beaches are also more prosperous. Its cold, drought-resistant and strong, and alkali-wet, happy in the sunny, well-drained lime soil or sand dune growth, but also often into the farmland, easy and beef heart Bu, Salix, Achnatherum constitute vegetation area, In the forest area is easy to form a simple small community. In northern Shaanxi, Sophora alopecuroides perennial regreens in early April, yellow butterfly flowers in late May, full bloom in mid-June, long pods in July and early August / early September. All fruits and roots are able to multiply. Sophora flavescens green manure, rich in resources, high efficiency, quick, use