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Transcript of Plant Nutrients
Category 2: Macronutrients
Category 3: Micronutrients
Criteria of Essential Nutrients
Plants need 16*
1-Plant must be unable to complete life cycle without nutrient
2-the function of the element cannot be replaced by another mineral element
3-the element must be directly involved in plant metabolism
These Essential Nutrients are categorized the following ways...
Makes up about 90-95% of plant weight.
Some plants require other micronutrients, such as Cobalt (Co), Nickel (Ni), Silicon (Si), or Sodium (Na).
pH impacts availability of mineral elements to plant roots
Range for most crops is 5.5-6.2 (slightly acidic)
5.5-6.2 creates the greatest average leavel for availability for all essential plant nutrients.
What happens if there aren't enough nutrients?
What happens if there are too many nutrients?
N-P-K are the nutrients used in commercial fertilizers. Here are 2 examples. For each, calculate the pounds of N, the pounds of P, the pounds of K, and the pounds of filler.
Pounds of N = 3.08 (14 x 0.22)
Pounds of P = 0.42 (14 x 0.03)
Pounds of K = 1.96 (14 x 0.14)
Pounds of filler = 8.54
Pounds of N = 8.00 (50 x 0.16)
Pounds of P = 2.00 (50 x 0.04)
Pounds of K = 4.00 (50 x 0.08)
Pounds of filler = 36
Chlorosis: yellowing of the tissue due to lack of chlorophyll
Necrosis: dead tissue (brown and crispy)
Margin: edge of leaf
Interveinal: tissue between leaf veins
Mobile: element is translocated from 1 area to another (will begin
in older leaves and move to newer leaves)
Immobile: element stays put (newer leaves)
A good example of necrosis
to identify nutrient deficiencies and toxicities
Now it's your turn...
A good example of chlorosis