The biomass of weed decreased with the increase of the amount of nitrogen fertilizer applied.
施磷和低播种密度均使杂草的密度和生物量显著增加。
They found that the amount of nitrous oxide produced in streams is related to human activities that release nitrogen into the environment, such as fertilizer use and sewage discharges.
他们发现，溪流中一氧化二氮的数量与人类活动释放到环境中的氮有关，如使用化肥和污水排放。
The flowering fertilizer will lower the amount of stored nitrogen in the plant and increase the amount of stored carbohydrates necessary for the production of roots.
开花肥会降低植物中贮存氮的量，而增加贮存为了根的生产需要的碳水化合物的量。
Our study suggested that the optimum amount of organic fertilizer in the red soil citrus orchards was about half of annual nitrogen fertilizer.
红壤柑桔园有机肥的施用量（指氮素）占总施肥量的一半左右是合适的。
The amount of the nitrogen mineralized by applying nitrogen fertilizer in continuously waterlogged incubation is much higher than that of control during the whole period of incubation.
土壤的氮素矿化氮量在连续培养过程中施氮肥处理明显高于对照处理；
The amount of the nitrogen mineralized by applying nitrogen fertilizer in continuously waterlogged incubation is much higher than that of control during the whole period of incubation.
土壤的氮素矿化氮量在连续培养过程中施氮肥处理明显高于对照处理；
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