average yield class
平均产量等级
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The tobacco yield, value of output, average price and rate of first-class tobacco leaves could be also increased by increasing the application ratio of serpentine-fused phosphate.
提高钙镁磷肥的施用比例，烤烟的产量、产值、均价、上等烟率等也相应提高。
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