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< 【 International Plant Cultivation and Parenting Skill Standard (Elementary)】II.Scientific Soil Testi
24. Calculation and Adjustment of Soil Porosity
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25. Soil Absorption Performance (I) - Soil Colloid
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26. Soil Absorption Performance (II) - Evaluation and Adjustment of Soil Absorption
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27. Determination and Adjustment of Total Water-Soluble Salt Amount in Soil
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28. Soil pH Measurement and Adjustment
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29. Determination of Soil Organic Component
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