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