1. Soil Nutrients Chapter #8

2. What nutrients do plants get from the air and water? Carbon Hydrogen Oxygen

3. What are the Primary Nutrients? Nitrogen Phosphorous Potassium

4. What are the Secondary Nutrients? Sulfer Calcium Magnesium

5. What are the Micronutrients? Iron Boron Zinc Manganese Copper Molybdenum Chlorine

6. What are the 16 essential nutrients? C HOPKNS CaFe Mg B Mn CuZn ClMo

7. Functions of Primary Nutrients and the deficiency symptoms? Nitrogen: other than water, most important, determines rate of growth –deficiency: yellowing of leaves Phosphorous: needed most during germination and during fruit/seed formation –deficiency: stunted growth, purple color in leaves Potassium: mostly regulatory –deficiency: stunted growth, mottled leaves

8. Are there non-essential plant nutrients that need to be considered? Yes, iodine and cobalt are essential in animals but found in plants

9. Why is a knowledge of soil nutrients necessary? maximize yield maximize profit maintain soil fertility

10. How do you determine soil fertility? soil testing manage organic matter fertilize

11. What is Fertilizer Analysis? it is the amount of the different nutrients found in a fertilizer the amount is listed as a percent it is ALWAYS listed Nitrogen-Phosphorous- Potassium (N-P-K) a fertilizer labeled 10-15-10 is 10% Nitrogen, 15% Phosphorous, and 10% Potassium if there is a fourth letter it is for Sulfer

12. How many pounds of Nitrogen are in a 50# bag of 10-15-10? 10% of 50# = 5# Nitrogen

13. Pounds of Actual Nutrients in a 50# bag of 10-15-10? add up 10+15+10 = 35% nutrients or 17.5#

14. What is the other 65% of this bag? inert matterials (filler)

15. Analysis A hobby gardener buys a bag of "Scott's Turfbuilder" uptown for $31.95. The bag weighs 62# and has an analysis of 22-3-3-10. How many pounds of actual nutrients? –17.2# What is the cost per pound of actual nutrients? –$1.86

16. Analysis A similar analysis of "Farmers Grade Fertilizer" runs about $0.40 per pound of actual nutrient.