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For perennial crops with multiple hay cuts, yield is entered as the sum of all cuts. However, using this total yield to calculate root and extra root C content can result in unrealistically high values. To avoid this, modified Sr (% roots returned to soil) and Se (% extra-roots returned to soil) values are used as proxies to reduce root and extra root C inputs to levels equivalent to a single cut. For example, with three hay cuts, Sr and Se values are divided by three. This approach is effective when root C content is calculated from yield (in the first and last years of the perennial stands). However, if yield from multiple hay cuts is low and yield-based root C content falls below 450 kg, model assumes a minimum root C content of 450 kg. In this case, further adjusting Sr and Se values based on the number of cuts is likely not appropriate, since their primary purpose is to reduce overall root and extra root C inputs originating from presumably high yield-based values.
A potential solution could be that Sr and Se should only be overridden and adjusted when yield from multiple hay cuts is high enough for root C to be calculated from yield rather than assumed at 450 kg. Further discussion and testing are needed before implementing this change to ensure it does not cause unintended effects elsewhere in the model or in other unknown and yet to be tested scenarios.
Code of Conduct
Contact Details
No response
Your suggestion.
For perennial crops with multiple hay cuts, yield is entered as the sum of all cuts. However, using this total yield to calculate root and extra root C content can result in unrealistically high values. To avoid this, modified Sr (% roots returned to soil) and Se (% extra-roots returned to soil) values are used as proxies to reduce root and extra root C inputs to levels equivalent to a single cut. For example, with three hay cuts, Sr and Se values are divided by three. This approach is effective when root C content is calculated from yield (in the first and last years of the perennial stands). However, if yield from multiple hay cuts is low and yield-based root C content falls below 450 kg, model assumes a minimum root C content of 450 kg. In this case, further adjusting Sr and Se values based on the number of cuts is likely not appropriate, since their primary purpose is to reduce overall root and extra root C inputs originating from presumably high yield-based values.
A potential solution could be that Sr and Se should only be overridden and adjusted when yield from multiple hay cuts is high enough for root C to be calculated from yield rather than assumed at 450 kg. Further discussion and testing are needed before implementing this change to ensure it does not cause unintended effects elsewhere in the model or in other unknown and yet to be tested scenarios.
Code of Conduct