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Wace 2012/2013Agric practical answers specimen A-wood ash, B-charcoal, C-limestone, D-garden soil, E-dilute acid, F-250 measuring cylinder Full practical answer A-wood ash/chemical compound (Ca4(PO4)2) B-charcoal/source(burnt wood) C-limestone/chemical compound(CaCO3) Advantages of B and C 1. Improve the soil structure 2. Increase organic matter breakdown 3. Increase microbial activities 4. Reduces soil pH 5. Enhances the movement of water and air Effects of excess A,B and C 1. Decrease the activities of soil microbes 2. Changes soil pH 3. Inhibit absorption of boron 4. Decrease the soil phosphorous 5. Differences of iron, magnesium and copper. Causes of soil acidity 1. Leaching 2. Excessive use of acid fertilizer 3. Heavy rainfall 4. Accumulation of hydrogen ions 5. Presence of sulphur in the soil 6. Purification in a water logged soil