延安以南塬区,土地面积广,雨量较多,是延安地区小麦主要产地,麦田占耕地50％左右。但因养地作物少,麦秋难倒茬,尤其是秋倒麦缺乏理想的养地作物,因而造成小麦连作年限长,产量低。多年来,当地秋倒麦多采用蔓小豆,但因产量低,收的迟,影响后茬小麦适时播种。为了给小麦寻找良好的前茬作物,我们于1970年开始,先后从延安地区农科所引春箭筈豌豆和其他豌豆进行比较,并观察后效。试验证明春箭筈豌豆可以代替蔓小豆,目前在大队已大面积推广。春箭筈豌豆是一种粮肥兼用豆科作物,春种夏收(3月中旬至7月中旬),生育期 In the south of Yan’an, the land area is wide and the rainfall is heavy, which is the main wheat producing area in Yan’an. The wheat fields account for about 50% of the cultivated land. However, due to the lack of land crops, wheat fall difficult stubble, especially the fall of autumn lack of wheat ideal for raising crops, resulting in continuous cropping wheat years, low yields. Over the years, the local fall over McDonald’s using vine small beans, but because of low yield, late harvest, timely cropping affected wheat crop. In order to find a good wheat for wheat crop, we started in 1970, successively from the Yanan Agricultural Science and Technology cited arrowhead peas and other peas were compared and observed after effects. Test proved that Spring Arrow Pea can replace vine small beans, the brigade has been widely promoted. Spring Arrow Pea is a grain-crop and leguminous crops, spring and summer harvest (mid-March to mid-July), the growth period