SOIL FERTILITY
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Transcript of SOIL FERTILITY
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SOIL FERTILITYSOIL FERTILITYINTRO TO SOILS
CH 10
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SOIL FERTILITYSOIL FERTILITY
Ability of soil to supply nutrients for plant growth
Readily Available – soil solutionNot Readily Available – mineral particles
Important Concepts:- quantity of nutrients- protection from leaching- availability- ease of root access
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SOIL FERTILITYSOIL FERTILITY
Essential Elements* needed for plant growth
* 18 elements identified as essential for plants
- essential elements used in large amounts are called macronutrients
- essential elements used in smaller amounts are called micronutrients
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SOIL FERTILITYSOIL FERTILITY
Three (3) nutrients are obtained fromair and water:
C, O, H
The other nutrients are obtained from the soil as ions(see fig. 9-1) except Boron (H3BO3) as Boric Acid
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NUTRIENT IONSNUTRIENT IONS
Ions are simply charged atoms or molecules . . .
Cations are positive (+)Anions are negative (-)
Charges result from difference in number of protons and electrons
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Plant roots absorb nutrient ions . . .
Soil particles adsorb nutrient ions
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Sources of Elements in SoilSources of Elements in Soil
Four Sources: (fig. 10-4, p.159)
Soil MineralsOrganic Matter
Adsorbed NutrientsDissolved Ions
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http://syllabus.syr.edu/esf/rdbriggs/for345/cation.htm