Clay and humus are negatively charged 3. Opposites attract 4. The higher the cation exchange capacity, the more closely the nutrients are held and the less likely they are to be lost to leaching 5. Each whole number change on the pH scale represents a tenfold change in acidity or alkalinity ii. The ideal pH range is 6.2 to 6.8 -Widest range of nutrients is available in this range ii.
Acid soils promote club root disease of cabbage Table.
Lime is used to raise the pH i. Adding organic matter alters this ratio 3. Organic matter decomposition can rob plants of the nitrogen they need for growth E. Compost 1. Compost is a living culture similar to yogurt 2. A store of nutrients and raw materials from which a soil is made b.