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17 Cards in this Set
- Front
- Back
6 elements for a medium of plant growth?
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1) Physical support
2) Air 3) Water 4) Temperature moderation 5) Protection from toxins 6) Nutrient elements |
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Elements used by plants
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1. Boron
2. Calcium 3. Carbon 4. Chlorine 5. Cobalt 6. Copper 7. Hydrogen 8. Iron 9. Magnesium 10. Manganese 11. Molybdenum 12. Nickel 13. Nitrogen 14. Oxygen 15. Phosphorus 16. Potassium 17. Sulfur 18. Zinc |
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Pnumonic device for remembering 18 essential elements
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C.B. HOPKiNS CaFe Co.
Closed Monday Morning and Night C u Zoon Mgiver |
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Elements aquired from air
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Carbon from CO2
Hydrogen from H2O Oxygen from O2 and H2O |
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Elements mostly from solid soils
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Ca2 +
K+ Mg2 + N from NO3-, NH4+ P from H2PO4-, HPO4 2- S from SO4 2- |
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5 essential functions of soil
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1) Medium for plant growth
2) Regulator of water supplies 3) Recycler of raw materials 4) Habitat for soil organisms 5) Engineering medium |
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Elements from solid soils
(Micronutrients) |
B from HBO3
Cl – Co 2+ Cu 2+ Fe 2+ Mn 2+ Mo from MoO4 2- Ni 2+ Zn 2+ |
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soil sphere
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pedosphere
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rock sphere
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lithosphere
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water sphere
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hydrosphere
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phytotoxic substances
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chemicals that are toxic to plants
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macronutrients
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Used in relatively large amounts - greater than .1% of dry plant tissue
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regolith
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the unconsolidated mantle of weathered rocks and soil material on the earth's surface (O through C horizons)
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saprolite
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disintegrated rock (loose enough to be dug with a spade) which remains in its original place
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solum
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the A and B horizons
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adsorption
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the attraction of ions to the surface of particles
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exchangeable ions
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ions which are released from colloidal substances
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