Usually, the season starts with a nice little pattern, a tri-petal flower or such like, one or maybe two in rape if we are lucky.

通常，怪圈季是以一个漂亮的小图案开场，比如三瓣花之类的。运气好的话，油菜田里会出现一两个怪圈。

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However the soil invertase activity between rape and wheat fields was at the same level, which showed that the plant did little influence to soil invertase activity.

油菜地各处理土壤过氧化氢酶活性高于小麦地相对应处理，而不同作物种植方式对土壤转化酶影响不明显。

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