名词
中文翻译：沉积物腐殖质
同义词：
['organic matter', 'humus', 'soil organic matter']
例句：
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1.The soil is rich in organic matter, which contributes to the growth of plants.
土壤富含有机物质，这有助于植物的生长。
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2.The humus in the soil helps to retain moisture and improve fertility.
土壤中的腐殖质有助于保持水分并提高肥力。
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3. The study found that humus levels in the soil were negatively correlated with crop yields.
研究发现，土壤中腐殖质的水平与作物产量呈负相关。