How To Prevent Nitrogen and Phosphorous Leaching

Aug 10, 2018

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In this episode, John discusses specific methods for the management of nitrogen and phosphorous for maximum benefit while reducing leaching, runoff, and pollution. Learn how to address nitrogen and phosphorus from both organic and conventional approaches. This episode contains effective, actionable information geared towards responsible and regenerative fertilizer management.

This episode is sourced from a previously recorded AEA webinar and contains specific AEA product recommendations -- which means, you can also tap into visual versions of this information, here:

Recorded Webinar presentation (video)

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Preventing Nitrogen and Phosphorous Leaching - Episode Highlights

Key Points:

Plant nutrients should be available without being water soluble
Nitrogen and phosphorus fertilizers can be stabilized to prevent them from leaching
We can maintain and increase yields while reducing nutrient runoff when the right technology is used

Phosphorus exists in the soil in four states:

Plant available inorganic, orthophosphate (1 lb per acre)
Microbially complexed, organic, unavailable (50 lb per acre)
Adsorbed to soil particles, unavailable (150 lb per acre)
Mineral, (includes precipitated), unavailable (up to 9000 lb per acre)

Phosphorus can be lost to water by:

Loss of soluble inorganic P shortly after applying
Loss of small soil particles with adsorbed P (majority)

Plant available inorganics:

Become rapidly complexed
Adsorption
Precipitation
Binds with Fe, Al, Mn in acidic soils, and Ca in alkaline soils
Best availability at ph 6-7

Microbial Complexed

Microbial processes mineralize and release orthophosphate,
Can tap into adsorbed P and mineral P
Optimal soil temperature of 65-105º F

To prevent phosphorus leaching

Accelerate the mineralization process to release more P from unavailable reserves
Mychorrizal fungi and phosphorus solubilizing bacteria (BioCoat Gold)
Apply P that is available but not soluble
Add stable humic substances which have a high anion exchange capacity, can hold P without leaching (HumaCarb)
Microbial stabilized nitrogen, added carbon, sulfur, molybdenum
Rejuvenate and ATS

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Resources

http://nmsp.cals.cornell.edu/publications/factsheets/factsheet12.pdf

https://www.sciencelearn.org.nz/resources/961-the-phosphorus-cycle

https://www.extension.umn.edu/agriculture/nutrient-management/phosphorus/the-nature-of-phosphorus/docs/the-nature-of-phosphorus.pdf

http://www.cropnutrition.com/availability-of-phosphorus-fertilizer

http://soilquality.org.au/factsheets/phosphorus

http://blog.nutri-tech.com.au/the-phosphate-equation/

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