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| 41. | indirect fertilizer |
| 间接肥料 |
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| 42. | fertilizer mixing |
| 配制肥料 |
|
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| 43. | concentration of fertilizer |
| 肥料浓度 |
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| 44. | commercial fertilizer |
| 商品肥料 |
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| 45. | manuring experiment |
| 肥料试验 |
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| 46. | superphosphate fertilizer |
| 过磷酸钙肥料 |
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| 47. | three major fertilizer |
| 三要素肥料 |
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| 48. | gaseous fertilizer |
| 气体肥料 |
|
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| 49. | trace element fertilizer |
| 微量元素肥料 |
|
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| 50. | fertility element |
| 肥料要素 |
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