乌拉特前旗位于内蒙古巴盟河套平原东尾部,属黄灌区最下游,由于排灌不配套,长期遭受上游排水、积水阴渗之苦,以致地下水位升高,引起土壤盐渍化,大面积的丰产田变中低产或弃耕。全旗1985年有耕地面积125万亩,到1991年耕地面积减少为110万亩,其中中低产田25万亩,盐渍化引起的弃耕地为15万亩,占1991年耕地面积的13.6％。近年来,我旗把白花草木樨作为主要草种进行中低产田和弃耕地的改良,效果显著。一、对中低产田的改良中低产田是指由于种种原因导致的土壤脊薄,地力下降的农田。利用草木樨属可培肥下降的地力。草木樨豆科牧草,植株富含大量的N、P、K、Ca,且根瘤还能固定空气中的游离N素。当作物收割 Wulateqianqi is located in the east tail of Hetao Plain in Bameng, Inner Mongolia. It belongs to the most downstream of Yellow River Irrigation District. Due to its lack of supporting irrigation and drainage, it has long suffered from upstream drainage and water seepage. As a result, groundwater level rises and causes soil salinization. Of the high-yielding fields in the low-yield or abandoned farming. In 1985, the entire county had 125 million mu of arable land. By 1991, the acreage of arable land was reduced to 1.1 million mu, of which 25 mu was middle and low yielding fields. The abandoned land due to salinization was 15 million mu, accounting for 13.6% of the cultivated land in 1991. . In recent years, the flag of the white flowers weed as a major grass species in low-yield fields and abandoned land improvement, the effect is remarkable. First, the improvement of middle and low yield field Low yield field refers to due to various reasons, the soil ridge is thin, decreased soil fertility. The use of plants can reduce the fertility of soil fertility. Herbivorous leguminous forage grass, plant rich in large amounts of N, P, K, Ca, and nodules can also be fixed in the air of free N prime. When the crop is harvested