Fertilizer Additive Selection

[RonColes]

I am interested to know how the selection of a fertilizer additive affects algorithms or emission calculations? I looked through the algorithm document and could not find a reference. Thank you.

[holos-aafc]

Hi Ron,

Holos uses the numerical values associated with the additive options from table 13 which is a code file beginning on line 193:

Holos/H.Core/Providers/Soil/Table_13_Soil_N2O_Emission_Factors_Provider.cs

Line 193 in dbe7667

public double GetReductionFactorBasedOnApplicationMethod(SoilReductionFactors soilReductionFactors)

This value is then used to calculate the base N2O emission factor according to equation 2.5.4-1. The reduction factor will be the "RF_AM" term in that equation.

Let me know if you have any other questions

Aaron

[RonColes]

Hi Aaron, Couple of questions: 1. How does Holos use the “Season of Application” when adding a fertilizer? 2. Is there any points in Holos where a fertilizer source (country) does not matter? Thanks ***@***.*** Ron Coles Senior Project Specialist Mobile 902-393-0841 Web www.lpconsulting.ca<http://www.lpconsulting.ca/> PO Box 193 Charlottetown, PE C1A 7K4 From: Aaron McPherson ***@***.***> Sent: November 18, 2024 3:41 PM To: holos-aafc/Holos ***@***.***> Cc: Ron Coles ***@***.***>; Author ***@***.***> Subject: Re: [holos-aafc/Holos] Fertilizer Additive Selection (Discussion #205) Hi Ron, Holos uses the numerical values associated with the additive options from table 13 which is a code file beginning on line 193: https://github.com/holos-aafc/Holos/blob/dbe7667929dee3f2cafbe2a1de7323ad17963ca5/H.Core/Providers/Soil/Table_13_Soil_N2O_Emission_Factors_Provider.cs#L193 This value is then used to calculate the base N2O emission factor according to equation 2.5.4-1. The reduction factor will be the "RF_AM" term in that equation. Let me know if you have any other questions Aaron — Reply to this email directly, view it on GitHub<#205 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BEWNNYEKN5EWE2IOJJ6ZUY32BI7GDAVCNFSM6AAAAABSANABMWVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMRZGYYTOMQ>. You are receiving this because you authored the thread.Message ID: ***@***.******@***.***>>

[holos-aafc]

Hi Ron, the season of application is a placeholder only. Right now it has no effect on the calculations but it will be utilized in a future version of Holos. It can be ignored for now.

The country of origin production is not currently considered. The only factor related to the production/location of the fertilizer is the values used from table 48. The referenced paper in that table might have more information. I'm not sure if this answers your second question or not. Let me know if it does.

Aaron

[RonColes]

So Holos assumes all fertilizers are made in the same country or have the same production value? ***@***.*** Ron Coles Senior Project Specialist Mobile 902-393-0841 Web www.lpconsulting.ca<http://www.lpconsulting.ca/> PO Box 193 Charlottetown, PE C1A 7K4 From: Aaron McPherson ***@***.***> Sent: December 11, 2024 1:44 PM To: holos-aafc/Holos ***@***.***> Cc: Ron Coles ***@***.***>; Author ***@***.***> Subject: Re: [holos-aafc/Holos] Fertilizer Additive Selection (Discussion #205) Hi Ron, the season of application is a placeholder only. Right now it has no effect on the calculations but it will be utilized in a future version of Holos. It can be ignored for now. The country of origin production is not currently considered. The only factor related to the production/location of the fertilizer is the values used from table 48. The referenced paper in that table might have more information. I'm not sure if this answers your second question or not. Let me know if it does. Aaron — Reply to this email directly, view it on GitHub<#205 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BEWNNYE5YSABCNTNO527SST2FB2W5AVCNFSM6AAAAABSANABMWVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCNJTGYYDMNA>. You are receiving this because you authored the thread.Message ID: ***@***.******@***.***>>

[RKroebel]

hi Ron, we use NorthAmerican numbers right now, as reported in the Bentrup paper, there is also numbers for other continents, but it seemed unlikely that farmers would know what continent their fertilizer is coming from, and we'd have to ask that. So for ease of use, we decided to assume all fertilizer is Canada/US made. If we were to consider sources from Russia (for instance), we'd also have to account for transport. This is something that can be done in the future, but not for the current version (as we are attempting to close it up).