1. Di Liang Michigan State University Kellogg Biological Station

2. Plants need the right combination of nutrients to live, grow and reproduce.

3. The major source of plant nutrition is the fixation of atmospheric CO 2 into sugar. CO 2 enters through the stomata.

4. Plants also need inorganic nutrients. Macronutrients and Micronutrients

5. Carbon, Hydrogen, Oxygen, Nitrogen, Potassium, Calcium, Phosphorus, Magnesium and Sulfur Each may exceed 1% dry weight of plant.

6. Iron, Chlorine, Copper, Manganese, Zinc, Molybdenum, and Boron Constitute from less than one, to several hundred PPM in most plants.

10. Plants will stop growing when a single nutrient is lacking although all other nutrients are sufficient.

11. General yellowing of older leaves (bottom of plant). The rest of the plant is often light green.

12. Corn: “V” shape on old leaves N deficiency

13. Leaf tips look burnt, followed by older leaves turning a dark green or reddish-purple.

14. Rice: decreased tiller number, smaller ear, less fruits

15. Citrus: thicker skin and lower quality

16. Older leaves may wilt, look scorched. Inter veinal chlorosis begins at the base, scorching inward from leaf margins.

17. Cotton: spots occurred between veins.

18. Tomato: “green back”

20. New leaves (top of plant) are distorted or irregularly shaped. Causes blossom-end rot.

21. Yellowing occurs between veins. “web” pattern is on old leaves.

23. Too much fertilizer Easy to control Straightforward

24. True Hoagland Solution 6 ml of 1 M potassium nitrate 4 ml of 1 M calcium nitrate 1 ml of 1 M monoammonium phosphate 2 ml of 1 M magnesium sulfate 1 ml of micronutrient stock solution 1 to 5 ml of iron chelate stock solution Micronutrient stock solution per liter: 2.86 g boric acid 1.81 g manganese chloride - 4 hydrate 0.22 g zinc sulfate - 7 hydrate 0.08 g copper sulfate - 5 hydrate 0.02 g 85% molybdic acid

25. ml-N-P-Fe 1M KNO 3 _55 1M Ca(NO 3 ) 2 _55 1M MgCl 2 222 1M KH 2 PO 4 1_1 0.05M FeEDTA11_ Micronutrient111 1M CaCl 2 5__ 0.5M Na 2 SO 4 522 Total1516

26. -N +N

27. Thank you!