豌豆是关中地区的重要倒茬作物。为了搞清其固氮情况,我们于1974年,对蒲城、户县、扶风、千阳等10个县的31块近1000亩豌豆田进行了调查。一、方法与结果 (一)调查方法采用七十年代胡济生介绍的豆科根瘤固氮效率大田调查法,于豌豆花期,取有代表性的根株100株,轻去根部土,按以下标准分级。 Peas are the important inverted crop in the Guanzhong region. In order to clarify its nitrogen fixation, we conducted a survey in 1974 on nearly 1,000 acres of pea fields in 10 counties including Pucheng, Huxian, Fufeng and Qianyang. First, the method and results (A) of the survey method Seventies Hu Jisheng introduction of legume nodulation nitrogen fixation efficiency field survey method, in the pea flowering period, take a representative root strain of 100, light to the root soil, according to the following criteria grading.