Section:Plant & Soil Science Unit:Soil Management Lesson Title: Lesson 3: Fertilizer Recommendations and Fertilizer Adjustments Lab.
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Section: Plant & Soil Science
Unit: Soil Management
Lesson Title: Lesson 3: Fertilizer Recommendations and Fertilizer Adjustments Lab
Bake some chocolate cookies!
You are making 200 cookies: You have the following quantities of ingredients
3/4 lbs of butter 2 teaspoons of salt 1 ½ cups of brown sugar 1 teaspoon of baking
soda 2 cups of sugar 1 cup of chopped nuts 5 eggs 6 cups of chocolate
chips 2 teaspoons of vanilla 8 cups of flour
Slide #1
Actual quantities needed You had the following quantities of ingredients
3/4 lbs of butter 2 teaspoons of salt 1 ½ cups of brown sugar 1 teaspoons of baking soda 2 cups of sugar 1 cup of chopped nuts 5 eggs 6 cups of chocolate chips 2 teaspoons of vanilla 8 cups of flour
You need the following quantities of ingredients
1 lb of butter 2 teaspoons of salt
2 cups of brown sugar 2 teaspoons of baking soda
2 cups of sugar 2 cups of chopped nuts
4 eggs 4 cups of chocolate chips
3 teaspoons of vanilla
4.5 cups of flour
Adequate
Deficient
Excessive
Slide #2
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
Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan
NITROGEN*
Soil TestNO3-N
Soil Test % Soil Organic Matter
0-0.5 06-1.0 1.1-1.5 1.6-2.0 >2.0
Ppm(lbs/A fertilizer N)
0-6 250 235 220 205 190
7-12 220 205 190 175 160
13-18 190 175 160 145 130
19-24 160 145 130 115 100
25-30 130 115 100 85 70
31-36 100 85 70 55 40
37-42 70 55 40 0 0
43-48 40 0 0 0 0
>48 0 0 0 0 0
Slide #4
Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan
Phosphorous
Soil Test P
Fertilizer P
(ppm) Lbs/A P2O5
0-3 80
4-7 50
8-11 30
>11 0
Slide #5
Potassium
Soil Test K
Fertilizer K
(ppm) Lbs/A K2O
0-60 64
61-120 40
>120 0
Fertilizer Recommendations for Irrigated Corn, Sorghum, and Sudan
Slide #6
Zinc recommendations for all crops
ZINC
Soil TestZINC
Irrigated Dryland
(lbs/A fertilizer Zn)
PPM Sensitive Crops(corn, sorphum, sudan, beans, potatoes)
0-0.9 10 5
1.0-1.5 5 0
>1.5 0 0
Other Crops
0-0.5 5 0
>0.5 0 0
Slide #7
Iron recommendations for all crops
Iron
Soil Test Fe
Iron recommendationFe Sensitive crops only
(corn, sorghum, sudan, beans, potatoes
(ppm)
0-3.0 Soil is deficient in available FE and corrective application will likely be beneficial.
3.1-5.0 Soil is marginally deficient in available iron and application may or may not be necessary.
>5.0 No Fe fertilization is required
Slide #8
Crop Low Moderate High
Electrical Conductivity(mmhos/cm)
SensitivePinto beans,
potatoes
0-2.5 2.6-5.0 >5.0
Moderately tolerant
Corn, sugarbeets, millet, oats, alfalfa
seeding, all grasses
0-4.0 4.1-8.0 >8.0
TolerantSorghum, barley,
wheat, sudangrass,
established alfalfa, forage sorphum x
sudan
0-6.0 6.1-12.0 >12.0
Soluble Salts Slide #9
Land Judging ScorecardSlide #10
FERTILIZER TREATMENT(5 points each)
Recommendations in lbs/A_____ NO3-N_____ P2O5
_______ K2O_____ Zn_____ Fe
SOLUBLE SALT LEVEL(5 points) low
moderate high
Assessment
Crop to be fertilized------------Irrigated CornOrganic matter content-------1.0%Nitrogen soil test--------------25 ppmPhosphorous soil test---------7 ppmPotassium soil test------------121 ppm
Zinc soil test--------------------0.8 ppmIron soil test--------------------5.1 ppm
Soluble salt reading-----------7.9mmhos/cm
Slide #11
Answers to Assessment
115 lbs/A of N03-N50 lbs/A of P2O50 lbs/A of K2O
10 lbs/A of Zn0 lbs/A of Fe
Moderate level of Soluble Salts
Slide #12
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.
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.
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.
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.
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