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< 【 International Plant Cultivation and Parenting Skill Standard (Elementary)】II.Scientific Soil Testi
32. Determination of Soil Alkaline Hydrolyzable Nitrogen+

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33. Classification and Characteristics of Nitrogen Fertilizers+ 34. Scientific Application of Nitrogen Fertilizer+ 35. Determination of Soil Effective Phosphorus Content+ 36. Types and Characteristics of phosphate fertilizers+

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