In many plants, including most tree crops, nitrate nitrogen does not usually occur in the leaves.

在一些植物中, 包括绝大多数的木本作物, 硝态氮并非经常存在于叶片中.

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Everybody concerned how to decrease the nitrate nitrogen content in vegetable increasingly.

如何降低蔬菜中的硝态氮含量受到人们日益广泛的关注.

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Objective To study the community of denitrifying bacteria and nitrate - nitrogen removal in downflow fixed - bed bioreactor.

目的研究下流式固定床反应器的脱氮效果及反硝化细菌群落结构.

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A direct method of determining nitrate nitrogen in ground water and drinking water has been studied.

文章探讨了一种测定地表水和饮用水中硝酸盐氮的直接方法——离子色谱法.

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The fertilizer product contains nitrate nitrogen and urea nitrogen and thus has high fertilizer effect.

该方法生产的产品中同时含有硝态氮,尿态氮,因此肥效显著.

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