直接播在地里，土壤传播的病虫害较多，地温较低，水分和湿度不易控制，影响发芽率。
Sow directly in the ground, the plant diseases and insect pests that soil transmits is more, ground temperature is inferior, moisture and humidity are controlled not easily, affect gemmiparous rate.
英格汉姆声称，一种普通土壤细菌的转基因版本如果被释放到野外，可能会传播并摧毁植物。
Ingham claimed that a GM version of a common soil bacterium could spread and destroy plants if released into the wild.
现在经由农民、花农和垂钓者的传播，蚯蚓俨然成了地下工程师，它们正在改良明尼苏达州、亚伯达省和安大略湖地区的成片土壤。
Spread today by farmers, gardeners and anglers, earthworms are obsessive underground engineers, and they are now remaking swathes of Minnesota, Alberta and Ontario.
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