求翻译：不同的老化时间培养蚯蚓7d后，土壤中结合态的菲也降低（图3-5，c），但变化没有明显的规律。由于含量极其微小，在较小浓度和早期的老化时间，几乎检测不到。高浓度在后来的老化时间有微量检测出。是什么意思？

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The aging time cultivating different earthworm after 7 D in the soil, combined with state of the Philippines is also reduced (figure 3-5, C), but there is no obvious pattern. The content is extremely small, in a small concentration and early aging time, almost without being detected. High-density in

After different aging time raise earthworm 7d, in the soil unifies condition the Philippines also reduces (chart 3-5, c), but change not obvious rule.Because the content is extremely small, in the small density and the early aging time, does not examine nearly.The high potency had micro in afterward

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