E7 Soil

3. Used in synthesis of enzymes.
4. The addition of this element creates a negative ion which is able to hold nutrients.
6. An organic acid found in humus (2 words).
9. One of the factors which change and deplete the amount of essential soil nutrients (2 words).
11. Dissolved metal ions found in soil which support plant growth.
13. Non-living organic components in the soil (3 words).
15. Organic matter causes soil to cluster and reduces this harmful phenomenon (2 words).

1. One of the elements involved in synthesis of amino acids, along with nitrogen.
2. Typical soil organic matter contains 5% of this element.
3. Pollutes soil from accidents from petroleum industries (2 words).
5. Covalently bonded lattice of silicon and oxygen found in soil.
7. Water insoluble mixture converted from organic matter.
8. Removal of essential nutrients and minerals in the soil food web (2 words).
10. The amount of organic matter in soil can be determined through use of this solution.
12. Continual water irrigation causes this effect, which reduces plant growth.
14. Nutrient absorption in roots is reduced by an concentration increase of salt ____.