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

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