黍子(Panicum miliaceum L.)很适于在美国中部大平原旱地栽培,每年种植面积达115000公顷。在粮食作物中,它需水量最少,水分利用效率最高,这是由于谷草比低(1:1)且叶面积较小的缘故。因此,在偏旱的中部大平原通常可获得可观的粮食产量。目前主要栽培技术措施是进行苗床耕耘来消灭杂草,而不是利用除草剂在生育期间除草。但是黍子与杂草竞争力较弱,其幼苗生长势也较弱,因此若在生长季节用除草剂防治一年生杂草,可增加黍 Panicum miliaceum L. is well-suited for cultivation in the drylands of the Great Plains of the Central United States, growing 115,000 hectares annually. In food crops, it requires the least water and has the highest water use efficiency due to its lower (1: 1) grain-to-straw ratio and smaller leaf area. As a result, considerable grain production is generally available in the drought-stricken Central Plains. At present, the main cultivation techniques are to cultivate the seedbed to eliminate the weeds instead of using herbicides to weed during the growing period. However, millet and weeds less competitive, and its seedling growth potential is weak, so if weeding herbicide in the growing season annual weeds can increase millet