Across
- 4. A mineral calcium sulfate, combined with water of hydration.
- 9. A popular water culture technique where the nutrient solution is continuously flowing at the tips of the plants roots set in a medium.
- 11. Fe; a metallic element essential to people, animals, and plants; very common in some minerals, most rocks, and all soils. In plants, iron deficiency results in iron chlorosis.
- 14. tester – An electronic device used to measure the electrical conductivity.
- 16. A numerical measure of acidity or hydrogen ion activity of a substance such as food or soil. The neutral point is pH 7.0. All pH values below 7.0 are acid and all above 7.0 are alkaline.
- 17. A chemical term referring to a basic solution over a pH of 7.
- 18. Refers to the extent of voids or openings in the soil that exist between soil particles and soil peds or clods. These pores hold water and air for absorption by plant roots.
- 20. The process by which air in the soil is replenished by air from the atmosphere.
- 22. A mineral, or minerals, classified with the micas, which with treatment at high temperatures, expands into scales, and becomes a loose, absorbent mass.
- 24. nutrients – Calcium, magnesium, and sulfur are the secondary nutrient elements, so called because they are essential to plant growth in lesser quantity that the primary nutrients nitrogen, phosphorus, and potassium, and in greater quantity than the micronutrients.
- 26. Yellowing or whitening of normally green leaves caused by lack of nutrients, air pollution, or diseases.
- 27. A volcanic glass having numerous concentric cracks that give rise to perlitic structure. Used in synthetic potting media mix.
- 28. For plants: boron, chlorine, cobalt, copper, iron, manganese, molybdenum, and zinc.
Down
- 1. Includes primary plant nutrients N, P, and K; and secondary plant nutrients Ca, Mg, and S.
- 2. A hydroponic system where the roots are in constant contact with the nutrient solution where the media may not be as absorbent.
- 3. Growing plants in a nutrient solution and a media other than soil.
- 5. Cl; a heavy gas used in very small amounts for the growth of plants.
- 6. Ca; a chemical element present in variable amounts in all soils. It is essential for plant and animal growth and is the principal mineral element in bones.
- 7. When molecular nitrogen biologically or chemically converts to organic combinations or forms available for biological processes. Biological fixation occurs with legumes, whereas chemical fixation involves the manufacture of ammonia. Legume roots convert nitrogen gas to nitrates by bacteria.
- 8. Measure of hydrogen ions in a solution.
- 10. Any organic or inorganic material added to soil or water to provide plant nutrients and to increase the growth, yield, quantity, or nutritive value to the plants grown therein.
- 12. B; an element essential for plant growth. The original source of boron is tourmaline, but available forms are from soil organic matter.
- 13. The removal of surplus ground or surface water by artificial means.
- 15. oxygen – The amount of oxygen found in water or solution.
- 16. Nitrogen, phosphorus, and potassium.
- 19. Fibers made of natural or synthetic minerals used as a media for growing plants in a hydroponic system.
- 21. Death of plant or animal cells of tissue, usually in localized areas.
- 23. An insufficiency in reference to amount, volume, proportion, etc.; a lack; a state of incompleteness.
- 25. A porous or spongy form of volcanic glass.