Transcript Soil Nutrients

Soil Nutrients
By:
Objectives
• Know the definition of deficiency, nutrient,
toxicity, macronutrient, micronutrient.
• Identify the plant deficiencies from pictures
• Evaluate a plant to identify the nutrient
absorption rate.
Terms and Definitions
• Nutrient – Element necessary for plant
growth and reproduction.
• Deficiency – Plant condition where an
essential nutrient is not sufficiently
available.
• Micronutrient – Nutrient needed in smaller
quantities
Terms and Definitions
• Macronutrient – Nutrient needed in larger
quantities
• Toxicity – A point that is reached where
too much of a nutrient becomes poisonous
Primary and Secondary Nurtrients
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Nitrogen
Phosphorus
Potassium
Calcium
Magnesium
Sulfur
Nitrogen Functions
• Gives plants the green coloring
• Makes up 1% to 4% of plant’s harvested
material
• Induces vigorous, rapid growth in plants
• 98% of the planet’s nitrogen is in the
primary rock of the Earth, the remaining
2% is in the atmosphere
• Most readily absorbed
Nitrogen Deficiency Symptoms
• Chlorosis – Yellowing in color of leaves
• Plant growth is stunted
Phosphorus
• Stimulates root growth
• Important for plant cells genetic material
and energy transfer with ATP
3rd most readily absorbed
Phosphorus Deficiency Symptoms
• Stunted Growth
• Purplish coloring of leaves
Potassium
• Production and translocation of
carbohydrates
• Water intake and respiration
• Stiffens stalks and straws
• 2nd most readily absorbed
Potassium Deficiency Symptoms
• Shorter and weaker plants
• Bronzing or a browning of leaf color
Magnesium
• Vital for photosynthesis
• Chlorophyll or the green coloring of the
plant
• Needed for protein synthesis
Magnesium Deficiency Symptoms
• Leaves curl along the margins
• Leaf parts show a whitish color
Calcium
• Gives plant strength
• Stimulates formation of nitrates
• Promotes root and leaf growth
Calcium Deficiency Symptoms
• Chlorosis beginning in the leaf edges and
moving inward
• Terminal buds become distorted
Sulfur
• Stimulates seed production
• Necessary for nodule formation on
legumes
• Affects protein and crop quality
Sulfur Deficiency Symptoms
• Similar symptoms to that of a nitrogen
deficiency
• Stunted appearance
Micronutrients in Plants
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Iron
Maganese
Boron
Molybdenum
Copper
Zinc
Chlorine
References
Laca, Andrew. “Ag Lesson Plans in Power Point”.
Soil Furtility. 19 May 2001. Glen Rose FFA, Glen
Rose., USA. 27 Feb 2005
<http://www.glenroseffa.org/lesson%20plans.ht
m>
Primal Seeds. 26 Oct 2002. 27 Feb 2005
<http://www.primalseeds.org/nutrients>
Nutrient Deficiency Symptoms on Agronomic
Crops. 12 June 2002. 27 Feb 2005
<http://www.nrs.mcgill.ca/whalen/nutrient/sympt
om.html>