名词
中文翻译：总氮量
同义词：
['total nitrogen', 'total available nitrogen']
例句：
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1. The soiltest showed a significant amount of total combined nitrogen in the topsoil.
土壤测试显示，表层土壤中有大量的总氮。
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2.The fertilizer application was crucial to increasing the total combined nitrogen levels in the crop.
施肥对提高作物中的总氮水平至关重要。
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3. The plant's growth rate is directly related to the availability of total combined nitrogen in the soil.
植物的生长速率与土壤中的总氮含量直接相关。