豌豆套种玉米是一种用养结合的生态性套种模式。其优点一是豌豆是良好的固氮作物,能提高土壤肥力,促进农田生态系统良性循环。二是方法简单,便于操作,适应性广,生产成本低,易于被广大农民接受。位于宁夏中部的同心扬黄灌区,土壤类型为低盐普通灰钙土,质地多为中、轻壤土,耕层有 Pea intercropping corn is a combination of ecological intercropping patterns. One of the advantages of pea is a good nitrogen-fixing crops, can improve soil fertility and promote a virtuous circle of farmland ecosystem. Second, the method is simple, easy to operate, wide adaptability, low production costs, easy to be accepted by the majority of farmers. The concentric Yanghuang Irrigation District, located in the central part of Ningxia, is characterized by low-salt ordinary calcareous soil, mostly of medium- and light-loam soil,