Decreased agricultural diversity from extensive use of the corn (Zea mays L.)- soybean (Glycine max (L.) Merr.) rotation and occasional inclusion of spring wheat (Triticum aestivum L.), has threatened cropping system sustainability. Using specialty oilseeds crops to extend the corn-soybean rotation might improve yields and promote sustainability. We tested whether corn, soybean, and wheat yields would be improved in a rotation following oilseed crops versus corn or soybean. In Phase 1, replicated blocks of nine different flowering oilseeds and two traditional grain crops (corn and soybean) were grown. In phase 2, corn, soybean, and wheat were planted in replicated blocks perpendicular to the previous year crops. This 2-year rotation was repeated for three site-years, two in Morris, MN and one in Brookings, SD. Soil water balance was evaluated during Phase 1 of the rotation to determine seasonal water use. Potential N mineralization was measured in the spring prior to planting in a subset of phase 1 treatments (spring canola, cuphea, corn, and soybean). Linear mixed models were used to analyze Phase 2 corn, soybean and wheat yield responses to previous crop. N dynamics and water use responses to phase 1 crops were also analyzed with mixed models. Corn yield was higher with any previous crop other than corn. Soybean and wheat yields did not significantly respond to previous crop. Yield patterns were partially explained by N mineralization potential and previous crop water use. Spring canola treatments provided higher potential net nitrification compared to corn. Canola, camelina, borage, and crambe had lower seasonal water use than both corn and soybean in at least one site-year. This short-term study indicated that corn and soybean yields following specialty oilseed crops had similar yields to a traditional corn-soybean rotation. Further, oilseed crops in rotation provided additional environmental benefits.

广泛使用玉米（Zea mays L。）-大豆（Glycine max（L.）Merr。）轮作以及偶尔包括春小麦（Triticum aestivum）导致农业多样性下降L.），威胁到种植系统的可持续性。使用特种油料作物来扩大玉米-大豆轮作可能会提高产量并促进可持续性。我们测试了与玉米或大豆相比，油料作物后轮作的玉米，大豆和小麦单产是否会提高。在阶段1中，种植了9种不同开花油料种子和两种传统谷物作物（玉米和大豆）的复制块。在第2阶段，将玉米，大豆和小麦种植在与上一年作物垂直的重复块中。重复进行了2年的轮换工作，历时3个站点年，其中两个在明尼苏达州的莫里斯，一个在南达科他州的布鲁金斯。在轮作的第一阶段评估了土壤水分平衡，以确定季节性用水量。在种植阶段1的子集（春季双低油菜，铜，玉米和大豆）。线性混合模型用于分析第二阶段玉米，大豆和小麦对先前作物的产量响应。还使用混合模型分析了对第一阶段作物的氮素动态和水分利用响应。除玉米外，其他任何以前的作物的玉米单产都较高。大豆和小麦的收成对以前的收成没有明显反应。氮的矿化潜力和以前的作物用水可以部分解释产量模式。与玉米相比，春季双低油菜籽处理提供了更高的潜在净硝化作用。双低油菜籽，山茶花，琉璃苣和克拉姆布在至少一个产地年均比玉米和大豆的季节性用水量低。这项短期研究表明，特种油料作物后的玉米和大豆单产与传统的玉米-大豆轮作相似。更多，