Di Liang Michigan State University Kellogg Biological Station.
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Transcript of Di Liang Michigan State University Kellogg Biological Station.
![Page 1: Di Liang Michigan State University Kellogg Biological Station.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649dbd5503460f94ab030f/html5/thumbnails/1.jpg)
A BRIEF INTRODUCTION ON PLANT NUTRITION AND HYDROPONICS
Di LiangMichigan State UniversityKellogg Biological Station
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Plants need the right combination of nutrients
to live, grow and reproduce.
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The major source of plant nutrition is the fixation of atmospheric CO2 into sugar. CO2 enters through the stomata.
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Not sufficient?
Plants also need inorganic nutrients. Macronutrients and Micronutrients
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Macronutrients
Carbon, Hydrogen, Oxygen, Nitrogen, Potassium, Calcium, Phosphorus, Magnesium and Sulfur
Each may exceed 1% dry weight of plant.
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Micronutrients
Iron, Chlorine, Copper, Manganese, Zinc, Molybdenum, and Boron
Constitute from less than one, to several hundred PPM in most plants.
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Functions
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Functions
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The Story of Boron
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Leybig’s Law of the Minimum
Plants will stop growing when a single nutrient is lacking although all other nutrients are sufficient.
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N deficiency
General yellowing of older leaves (bottom of plant). The rest of the plant is often light green.
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Corn: “V” shape on old leaves
N deficiency
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P deficiency
Leaf tips look burnt, followed by older leaves turning a dark green or reddish-purple.
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P deficiency
Rice: decreased tiller number, smaller ear, less fruits
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P deficiency
Citrus: thicker skin and lower quality
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K deficiency
Older leaves may wilt, look scorched. Inter veinal chlorosis begins at the base, scorching inward from leaf margins.
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K deficiency
Cotton: spots occurred between veins.
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K deficiency
Tomato: “green back”
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K deficiency
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Ca deficiency
New leaves (top of plant) are distorted or irregularly shaped. Causes blossom-end rot.
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Mg deficiency
Yellowing occurs between veins. “web” pattern is on old leaves.
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Mg deficiency
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Why hydroponics
Too much fertilizer Easy to control Straightforward
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True Hoagland Solution
6 ml of 1 M potassium nitrate4 ml of 1 M calcium nitrate
1 ml of 1 M monoammonium phosphate2 ml of 1 M magnesium sulfate
1 ml of micronutrient stock solution1 to 5 ml of iron chelate stock solution
Micronutrient stock solution per liter:
2.86 g boric acid1.81 g manganese chloride - 4 hydrate
0.22 g zinc sulfate - 7 hydrate0.08 g copper sulfate - 5 hydrate
0.02 g 85% molybdic acid
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Hydroponics
ml -N -P -Fe
1M KNO3 _ 5 5
1M Ca(NO3)2 _ 5 5
1M MgCl2 2 2 2
1M KH2PO4 1 _ 1
0.05M FeEDTA 1 1 _
Micronutrient 1 1 1
1M CaCl2 5 _ _
0.5M Na2SO4 5 2 2
Total 15 16 16
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Roots
-N+N
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Thank you!