以下为句子列表：
英文: As an example, when potash use is between 75kg/ha and 150kg/ha, an increase in nitrogen application from 150 to 225kg/ha increases the MPP of potash from 11.4 to 23.1.
中文: 例如，当钾肥用量为75~150公斤/公顷时，氮肥用量由150公斤/公顷增加到225公斤/公顷使得钾肥的边际产量由11.4增至23.1。
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英文: In particular, an increase in the amount of nitrogen applied has the effect of increasing the MPP of potash.
中文: 特别是氮肥用量的增加具有提高钾肥边际产量的作用。
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英文: It should be stressed that the calculation of the MPP does not involve dividing the difference between the yield at a given level of fertilizer and the base yield when no fertilizer is applied by the total amount of fertilizer used.
中文: 应该强调的是，边际产量的计算并非是用一定的肥料用量水平下的产量与不用肥料的情况下的产量之差除以总的肥料用量。
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英文: Table 1 shows the calculation of the MPP for potash on early and late rice in Hubei.
中文: 表1所示为湖北省早、晚稻钾肥施用的边际产量。
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英文: Table 2 also shows that a change in the level of nitrogen application affects the MPP of potash use for any given level of potash use.
中文: 表2又表示在钾的各个用量水平，氮肥用量的变化对钾肥边际产量的影响。
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