This paper briefly introduces the principle of energy saving of frequency control and the result and advantages of application frequency control in the control system of Roots blower.

该文简要介绍了变频调速节能原理及在罗茨式鼓风机控制系统采用变频调速的效果与优点。

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Field trials show: compared with common NPKs, specialty fertilizers increase the yield of wheat by 5.9%, rape seed by 7.2%, rice by 7.3%, vegetable by 9.1%, and the application frequency is decreased.

田间试验表明：施用腐植酸系列专用肥与普通复混肥相比，小麦平均增产7.2%，油菜平均增产7.2%，水稻平均增产7.3%，蔬菜平均增产9.1%，且可减少施肥次数。

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Field trials show: compared with common NPKs, specialty fertilizers increase the yield of wheat by 5.9%, rape seed by 7.2%, rice by 7.3%, vegetable by 9.1%, and the application frequency is decreased.

田间试验表明：施用腐植酸系列专用肥与普通复混肥相比，小麦平均增产7.2%，油菜平均增产7.2%，水稻平均增产7.3%，蔬菜平均增产9.1%，且可减少施肥次数。

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