夏天施三次平衡肥料。

Fertilize three times in summer with balanced fertilizer.

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在国家紫色土肥力与肥料效益监测基地上，研究了稻麦轮作制度下紫色土稻田生态系统中钾素的平衡状况。

Potassium(K) balance in purple soil rice field ecosystem under rice-wheat rotation were studied on the National Purple Soil Fertility and Fertilizer Efficiency Monitored Base.

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肥料的平衡应用是必需的，以便增加可耕地的肥力。

A balanced application of fertiliser is required in order to increase arable land fertility.

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