Autotrophic nitrogen removal in granular sequencing batch ...
Plant Nutrition. Nutritional needs Autotrophic does not mean autonomous… plants need… sun as...
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Transcript of Plant Nutrition. Nutritional needs Autotrophic does not mean autonomous… plants need… sun as...
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Plant Nutrition
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Nutritional needsAutotrophic does not mean autonomous…
plants need…
sun as an energy source
inorganic compounds as raw materials:
water (H2O)
CO2
minerals
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Plants require these elements in
relatively large amounts:
Think….“C H O P S N K”
Plus: Ca & Mg…
We call these:
Macronutrients
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For what & from where?
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Chlorophyll
Why does magnesium
deficiency cause the yellowing of
leaves ?
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Symptoms of Deficiencies
MOBILE-
Some nutrients are more mobile than others…
Symptoms show up in older parts first.Shunted to younger parts “preferentially”.
IMMOBILE- Symptoms show up in younger parts first.
Get “stuck” in the older part….
Example: Mg
Example: Fe
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Water & mineral uptake
Water uptake
plants cannot extract all water from soil,only free waterosmosis
Cation uptakecation uptake is aided by H+
secretion by root cells
(proton pump)
Campbell Animations
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Fertilizers
“Organic” fertilizers
manure, compost, fishmeal
“Chemical” fertilizers
commercially manufactured
N-P-K (ex. 15-10-5)
15% nitrogen
10% phosphorus
5% potassium
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Nitrogen uptakeNitrates
plants can only take up nitrate (NO3-)
Nitrogen cycle by bacteria
trace path of nitrogen fixation!
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Nitrogen uptake continued…
The rhizobium have an enzyme called “nitrogenase”
N2 + e- + 6 H+ + 32 ATP 2NH3
Very energy consuming: 32 ATP molecules just for 2 NH3 !!!Contains “leghemoglobin” for high oxygen demands.
Roots send out “flavinoids” which attract the rhizobium.
Rhizobium, in turn, emit chemicals which stimulate root hair elongation with “infection threads for a portal of entry for the bacteria.
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Another example of mutualistic symbiosis:
MycorrhizaeModified roots that are part fungus
Fungi secrete growth factors & increase surface area for greater absorption for the plant….
Plant provides and stores food for the fungus.