1. Section:Plant & Soil Science Unit:Soil Management Lesson Title: Lesson 3: Fertilizer Recommendations and Fertilizer Adjustments Lab

2. Bake some chocolate cookies! You are making 200 cookies: You have the following quantities of ingredients 3/4 lbs of butter2 teaspoons of salt 1 ½ cups of brown sugar1 teaspoon of baking soda 2 cups of sugar1 cup of chopped nuts 5 eggs6 cups of chocolate chips 2 teaspoons of vanilla 8 cups of flour Slide #1

3. Actual quantities needed You had the following quantities of ingredients 3/4 lbs of butter2 teaspoons of salt 1 ½ cups of brown sugar1 teaspoons of baking soda 2 cups of sugar1 cup of chopped nuts 5 eggs6 cups of chocolate chips 2 teaspoons of vanilla 8 cups of flour You need the following quantities of ingredients 1 lb of butter2 teaspoons of salt 2 cups of brown sugar2 teaspoons of baking soda 2 cups of sugar2 cups of chopped nuts 4 eggs4 cups of chocolate chips 3 teaspoons of vanilla 4.5 cups of flour Adequate Deficient Excessive Slide #2

4. PSS #4 Making Fertilizer Recommendations Student Learning Objectives (Enablers) As a result of this lesson, the student will: 1. Use given data to make fertilizer recommendations for crops in Colorado. 2. Be able to complete the fertilizer recommendation part of the Colorado Land Classification CDE. Slide #3

5. Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan NITROGEN* Soil Test NO 3 -N Soil Test % Soil Organic Matter 0-0.506-1.01.1-1.51.6-2.0>2.0 Ppm (lbs/A fertilizer N) 0-6250235220205190 7-12220205190175160 13-18190175160145130 19-24160145130115100 25-301301151008570 31-3610085705540 37-4270554000 43-48400000 >4800000 Slide #4

6. Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan Phosphorous Soil Test PFertilizer P (ppm)Lbs/A P 2 O 5 0-380 4-750 8-1130 >110 Slide #5

7. Potassium Soil Test KFertilizer K (ppm)Lbs/A K 2 O 0-6064 61-12040 >1200 Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan Slide #6

8. Zinc recommendations for all crops ZINC Soil Test ZINC IrrigatedDryland (lbs/A fertilizer Zn) PPMSensitive Crops (corn, sorphum, sudan, beans, potatoes) 0-0.9105 1.0-1.550 >1.500 Other Crops 0-0.550 >0.500 Slide #7

9. Iron recommendations for all crops Iron Soil Test Fe Iron recommendation Fe Sensitive crops only (corn, sorghum, sudan, beans, potatoes (ppm) 0-3.0Soil is deficient in available FE and corrective application will likely be beneficial. 3.1-5.0Soil is marginally deficient in available iron and application may or may not be necessary. >5.0No Fe fertilization is required Slide #8

10. Crop LowModerateHigh Electrical Conductivity (mmhos/cm) Sensitive Pinto beans, potatoes 0-2.52.6-5.0>5.0 Moderately tolerant Corn, sugarbeets, millet, oats, alfalfa seeding, all grasses 0-4.04.1-8.0>8.0 Tolerant Sorghum, barley, wheat, sudangrass, established alfalfa, forage sorphum x sudan 0-6.06.1-12.0>12.0 Soluble Salts Slide #9

11. Land Judging Scorecard Slide #10 FERTILIZER TREATMENT (5 points each) Recommendations in lbs/A _____ NO3-N _____ P2O5 _______ K2O _____ Zn _____ Fe SOLUBLE SALT LEVEL (5 points)  low  moderate  high

12. Assessment Crop to be fertilized------------Irrigated Corn Organic matter content-------1.0% Nitrogen soil test--------------25 ppm Phosphorous soil test---------7 ppm Potassium soil test------------121 ppm Zinc soil test--------------------0.8 ppm Iron soil test--------------------5.1 ppm Soluble salt reading-----------7.9mmhos/cm Slide #11

13. Answers to Assessment 115 lbs/A of N03-N 50lbs/A of P2O5 0 lbs/A of K2O 10lbs/A of Zn 0 lbs/A of Fe Moderate level of Soluble Salts Slide #12

15. Fertilizer worksheet for Irrigated corn, sorghum and sudan for grain Step 1. Find Organic Matter and Write it here____________________ Step 2. Find the Nitrogen PPM and write it here__________________ Step 3. Using both numbers on the chart write your initial N rec. here______________ Step 4. Subtract yield goal from 150 and write number here___________________ Step 5. If step 4 answer is zero then write step 3 answer on score sheet. Step 6. If step 4 answer different then zero go to step 7. Step 7. Take Step 4 answer divided by 25 and write answer here________________ Step 8. Take step 7 answer and multiply by 40 and write answer here______________ Step 9. If yield goal is greater than 150 ADD step 8 answer to step 3 number and write total answer on score sheet. Step 10. If yield goal is less than 150 SUBTRACT step 8 answer from step 3 answer and write total answer on score sheet.

17. Fertilizer Worksheet for corn, sorghum, and sudan used for silage Step 1. Find Organic Matter and Write it here____________________ Step 2. Find the Nitrogen PPM and write it here__________________ Step 3. Using both numbers on the chart write your initial N rec. here______________ Step 4. Subtract yield goal from 30 and write number here___________________ Step 5. If step 4 answer is zero then write step 3 answer on score sheet. Step 6. If step 4 answer different then zero go to step 7. Step 7. Take Step 4 answer divided by 10 and write answer here________________ Step 8. Take step 7 answer and multiply by 40 and write answer here______________ Step 9. If yield goal is greater than 30 ADD step 8 answer to step 3 number and write total answer on score sheet. Step 10. If yield goal is less than 30 SUBTRACT step 8 answer from step 3 answer and write total answer on score sheet.

19. Fertilizer Worksheet for Irrigated grass, grass legume hay, pasture and mountain meadows. Step 1. Find Organic Matter and Write it here____________________ Step 2. Find the Nitrogen PPM and write it here__________________ Step 3. Using both numbers on the chart write your initial N rec. here______________ Step 4. Subtract yield goal from 4 and write number here___________________ Step 5. If step 4 answer is zero then write step 3 answer on score sheet. Step 6. If step 4 answer different then zero go to step 7. Step 7. Take Step 4 answer multiply by and write answer here________________ Step 8. If yield goal is greater than 4 ADD step 7 answer to step 3 number and write total answer on score sheet. Step 9. If yield goal is less than 4 SUBTRACT step 7 answer from step 3 answer and write total answer on score sheet.

21. Fertilizer worksheet for Dry-land Winter Wheat and other small grains Step 1. Find Organic Matter and Write it here____________________ Step 2. Find the Nitrogen PPM and write it here__________________ Step 3. Using both numbers on the chart write your initial N rec. here______________ Step 4. Subtract yield goal from 50 and write number here___________________ Step 5. If step 4 answer is zero then write step 3 answer on score sheet. Step 6. If step 4 answer different then zero go to step 7. Step 7. Take Step 4 answer divided by 10 and write answer here________________ Step 8. Take step 7 answer and multiply by 25 and write answer here______________ Step 9. If yield goal is greater than 50 ADD step 8 answer to step 3 number and write total answer on score sheet. Step 10. If yield goal is less than 50 SUBTRACT step 8 answer from step 3 answer and write total answer on score sheet.