Buy a subscription

Home Contact Sitemap login Checkout

Farming Smarter

Farming Smarter
  • Home
  • Who We Are
    • Who We Are
    • Staff Directory
    • Board of Directors
    • Contact Us
  • What We Do
    • What We Do
    • Agronomy Research
    • Commercial Innovation
    • Field Tested
    • Knowledge & Network
  • What We Offer
    • What We Offer
    • Sponsorship Packages
    • Events
    • Research Projects
      • Research Projects
      • Agronomy Research Projects
      • Field Tested Projects
      • Commercial Innovation Projects
    • Subscriptions
      • Subscriptions
      • FS Agronomy Subscription
      • FS Digital Subscription
    • Smart Partner Program
    • Speakers
  • Get Involved
    • Get Involved
    • Jobs
    • Sponsorship
    • I want to help!
    • With On-farm Research
    • With Product Testing
    • With Small Plot Research
    • Internship Opportunities
    • Volunteer!
    • Support Research!
  • Learning Resources
    • Learning Resources
    • Conservation Agronomy
    • Magazine
    • Online Classroom (CEU)
    • News Articles
    • Videos
    • Publications & Reports
      • Publications & Reports
      • Published Papers
      • Research Reports
    • Podcasts
    • 360 Videos
Print This Page

Save that nitrogen!

Saturday, July 24, 2021

Soil Savvy

Ammonia volatilization

by Gurbir Dhillon Ph.D.

Environmental factors can affect the way nitrogen fertilizers work in a crop particularly when surface applied.

Surface applied ammonium-based fertilizers such as urea or urea ammonium nitrate (UAN) can lose nitrogen through ammonia volatilization (evaporation).

Similarly, the breakdown of farm manures or soil organic residues may also lead to ammonia volatilization. Multiple factors may impact the rate of ammonia volatilization and reduce N use efficiency.

Surface applied fertilizers or manure can lose 25 - 75% more through ammonia volatilization compared to when they are soil incorporated. Sandy, alkaline, and calcareous soils favor high ammonia volatilization especially if they are exposed to rapid wetting and drying.

A study in Montana, US observed 30 - 44% loss in urea applied to moist soil surface followed by subsequent slow drying without precipitation. Precipitation following urea broadcast helped reduce losses by moving the fertilizer into deeper soil layers.

High temperatures, that often occur on soil surfaces, and windy conditions also favor ammonia evaporation. Studies in western Canada observed volatilization losses of 38-46% of urea at 25oC compared to only 7% loss at 15oC temperature.

Urea application can artificially increase soil pH around urea granules temporarily and result in substantial losses even from soils with low pH. Polymer-coated urea generally decreases volatilization losses by slowing the conversion of urea to ammonium combined with lesser increase in soil pH around fertilizer granules.

Farming Smarter

211034 Hwy 512, Lethbridge County, AB
T1J 5N9 Canada

Quick Links

Who We Are

What We Do

What We Offer

Get Involved

Learning Resources

More

Staff Directory

Contact

Copyright © Farming Smarter 2023. All rights reserved | Privacy Policy | Terms & Conditions