Authored by John Sawyer

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2018 Soil Fertility and Nutrient Management Short Course Blog Post
45th Annual North Central Extension-Industry Soil Fertility Conference ICM News
47th Annual North Central Extension-Industry Soil Fertility Conference Blog Post
49th Annual North Central Extension – Industry Soil Fertility Conference Blog Post
A Late Spring - Nitrogen Considerations ICM News
A New Late-Spring Soil Nitrate Test Publication Now Available ICM News
Anhydrous Ammonia Application -- Spring 2019 ICM News
Anhydrous Ammonia Application and Dry Soils ICM News
Anhydrous Ammonia Application in Dry Soil Blog Post
Anhydrous ammonia applications and corn planting Blog Post
Anhydrous application and dry soils Encyclopedia Article
Application checkpoints for fall ammonia Encyclopedia Article
Apply Nitrogen or Plant Corn? ICM News
Applying Additional Nitrogen (and Sulfur) After Wet Conditions ICM News
Applying Additional Nitrogen After Wet Conditions ICM News
Be Cautious When Interpreting Fall Soil-Test Results Following Drought ICM News
Biological Breakdown of Wind Destroyed Corn Blog Post
Carbon and nitrogen cycling with corn biomass harvest Encyclopedia Article
Care with Plant Nutrient Analysis ICM News
Compressed Spring Workload in 2014? What are Nitrogen Application Options? ICM News
Corn Following Corn in 2008 ICM News
Corn leaf potassium deficiency symptoms Encyclopedia Article
Corn Nitrogen Rate Calculator Update ICM News
Corn Nitrogen Rate Calculator Website - 2018 Update Blog Post
Corn Nitrogen Rate Calculator Website Update ICM News
Corn response to supplemental nitrogen Encyclopedia Article
Corn Seedling Damage from Ammonia ICM News
Corn Stalk Nitrate Interpretation ICM News
Corn: Uneven Early-Season Growth Can Mean Uneven Tasseling ICM News
Cornstalk nitrate interpretation Encyclopedia Article
Crop Sulfur Fertilization This Spring ICM News
Don't double dip soybean Encyclopedia Article
Dry fall conditions can lead to field fires Encyclopedia Article
Effects of Unharvested, Shattered, or Hailed-out Soybean Fields on Nutrient Supply for Corn ICM News
Emerged Corn, Herbicides and Nitrogen ICM News
Equipment Considerations for Anhydrous Ammonia Application ICM News
Equipment considerations: anhydrous ammonia Encyclopedia Article
Equipment considerations: dry granular fertilizer Encyclopedia Article
Equipment considerations: liquid fertilizer Encyclopedia Article
Equipment maintenance: Fertilizer applicators Encyclopedia Article
Estimating losses when cornstalk fields are accidentally burnt Encyclopedia Article
Estimating Nitrogen Losses ICM News
Estimating Nitrogen Losses ICM News
Estimating Nitrogen Losses ICM News
Estimating nitrogen losses -- early spring 2007 Encyclopedia Article
Estimating Nitrogen Losses in Wet Corn Fields ICM News
Extension Offers Soil Fertility Short Course Blog Post
Fact or Fiction: Ammonia Application Should Not Exceed 10 lb N per Unit Soil CEC ICM News
Fall 2020 Nitrogen Considerations Blog Post
Fall Fertilizer Nitrogen Application ICM News
Fall Nitrogen Applications and Soil Temperature ICM News
Fertilizer Nitrogen Application This Fall ICM News
Flood Adulterated Grain - Nutrient Supply to Crops When Land Applied ICM News
Foliar Fertilization of Corn and Soybean ICM News
Getting Ready for Fall Fertilization ICM News
Gypsum: an old product with a new use Encyclopedia Article
Is it iron or potassium deficiency? Encyclopedia Article
Is It Nitrogen or Sulfur Deficiency Symptoms Blog Post
ISU Extension and Outreach Offers Soil Fertility Short Course ICM News
It’s a Late Spring: Should You Apply Nitrogen or Plant Corn? ICM News
Late-Spring Soil Nitrate Test (LSNT) Use in 2019 ICM News
Late-Vegetative Corn Stage Soil Sampling for Nitrate-N ICM News
Making Fertilization Decisions as Fertilizer Prices Escalate and Production Costs Are High - Part 1 ICM News
Making Fertilization Decisions as Fertilizer Prices Escalate and Production Costs Are High - Part 2 ICM News
Management of phosphorus for crop production Encyclopedia Article
Measuring Corn Nitrogen Status ICM News
Measuring the Nitrogen Status ICM News
New Manure Nutrient Management Research Available ICM News
Nitrogen Considerations with Dry Conditions in 2017 ICM News
Nitrogen Fertilization Options with Delayed or Rescue Applications ICM News
Nitrogen Issues So Far This Spring ICM News
Nitrogen Loss - Spring 2013 ICM News
Nitrogen Loss – How Does it Happen? ICM News
Nitrogen loss: How does it happen? Encyclopedia Article
Nitrogen Loss? ICM News
Nitrogen losses after the heavy rains Encyclopedia Article
Nonconventional Soil Additives and Programs ICM News
Nutrient removal when harvesting corn stover Encyclopedia Article
Nutrient Removal When Harvesting Corn Stover ICM News
Pay attention to management needs of fertilizer products Encyclopedia Article
Phosphorus - Why the concern about water quality? Encyclopedia Article
Phosphorus and Potassium in Silage Harvest of Drought-Damaged Corn ICM News
Phosphorus and Potassium in Silage Harvest of Drought-Damaged Corn ICM News
Phosphorus Basics Encyclopedia Article
Phosphorus in aquatic systems Encyclopedia Article
Phosphorus, Potassium and pH Management Issues Following Drought-damaged Crops ICM News
Phosphorus, Potassium, and pH Management Following Drought Affected Crops ICM News
Post-plant nitrogen applications on corn Encyclopedia Article
Potassium deficiency symptoms in corn Encyclopedia Article
Potential Nitrogen Loss - 2018 ICM News
Potential Nitrogen Loss in Spring 2017 ICM News
Precipitation and nitrogen this spring Blog Post
Relationship of Nitrogen Conversion in Soil to N Loss ICM News
Remember 50 degrees Encyclopedia Article
Revised beef cattle and dairy manure nitrogen and phosphorus crop availability ranges Blog Post
Sampling for the End-of-Season Corn Stalk Nitrate Test Blog Post
Soil calcium:magnesium ratios Encyclopedia Article
Soil Fertility Management Issues Following Drought-damaged Crops - Nitrogen ICM News
Soil Fertility Short Course offers in-depth, practical training Blog Post
Soil Fertility Web Site Update Blog Post
Soil Profile Nitrate in Corn Fields Following the 2012 Drought ICM News
Soil Profile Nitrate – Spring 2013 Sampling Summary ICM News
Soil resources of phosphorus Encyclopedia Article
Soybean Top Dieback Shows Up in Iowa Again ICM News
Spring Corn Nitrogen Fertilization Considerations ICM News
Springtime Precipitation – A Tool for Estimating Nitrogen Application Need for Corn ICM News
Studying Stover Harvest Effects on Yield, Soil, Climate ICM News
Surface Waters: Ammonium is Not Ammonia – Part 1 ICM News
Surface Waters: Ammonium is Not Ammonia – Part 2 ICM News
Surface Waters: Ammonium is Not Ammonia – Part 3 ICM News
The Corn Nitrogen Rate Calculator - 2017 Update Blog Post
The Corn Nitrogen Rate Calculator website redo Blog Post
The Illinois Soil Nitrogen Test: Should it be used in Iowa? Encyclopedia Article
Tissue Testing for Field Crops Requires Cautious Use and Interpretation ICM News
UAN and herbicide applications on emerged corn Blog Post
UAN and Herbicides on Emerged Corn ICM News
UAN and Herbicides on Emerged Corn ICM News
Understanding Anhydrous Ammonia Application in Soil ICM News
Update to Iowa Phosphorus, Potassium and Lime Recommendations ICM News
Wait Until Soil Temps Drop Before Applying Anhydrous Ammonia ICM News
Watch for damage from broadcast postemerge UAN applications Encyclopedia Article
Watch the Soil Temperature ICM News
Wet Conditions and Change in Soil Profile Nitrate ICM News
Wet Soil Conditions and Nitrogen Loss ICM News
What about N losses in 2000? Encyclopedia Article
Why manage phosphorus? Encyclopedia Article
Wind Damaged Corn – Nutrient Content? ICM News
Yellow Corn Plants ICM News
Yellow Corn, Wet Soils and N Loss - Part 1 ICM News
Yellow Corn, Wet Soils, and N Loss – Part 2 ICM News
Yellow Corn, Wet Soils, and N Loss – Part 4 ICM News
Yellow corn, Wet soils, and Nitrogen loss (Part 3) ICM News