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< 【 International Plant Cultivation and Parenting Skill Standard (Elementary)】II.Scientific Soil Testi
8. Essential Nutrients for Plants+ 9. Nutrient Absorption and Characteristics of Plants+ 10. Phytonutrient Deficiency+ 11. Basic Principles of Scientific Fertilization+

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12. Fertilization Period and Fertilization Amount+ 13. Scientific Fertilization Methods+

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