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< 【 International Plant Cultivation and Parenting Skill Standard (Elementary)】II.Scientific Soil Testi
37. Scientific Application of Phosphate Fertilizer
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38. Application Method of Superphosphate
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39. Determination of Soil Effective Potassium Content
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40. Types and Characteristics of Potash Fertilizers
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41. Scientific application of Potassium Fertilizer
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