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< 【 International Plant Cultivation and Parenting Skill Standard (Elementary)】II.Scientific Soil Testi
24. Calculation and Adjustment of Soil Porosity+ 25. Soil Absorption Performance (I) - Soil Colloid+

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26. Soil Absorption Performance (II) - Evaluation and Adjustment of Soil Absorption+ 27. Determination and Adjustment of Total Water-Soluble Salt Amount in Soil+ 28. Soil pH Measurement and Adjustment+ 29. Determination of Soil Organic Component+

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