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Regenerative Agriculture and Direct Drilling
Regen Ag General Discussion
Biological Brews
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<blockquote data-quote="Simon C" data-source="post: 7259687" data-attributes="member: 319"><p>I am having a real struggle with this idea ATM. Cut N and you stop burning organic matter, cut down other inputs and your OM starts building. I have enough evidence now from 63 OM tests over 20 years to say that I am sequestering about 1 tonne of carbon per hectare a year. But organic matter is not just carbon, it has a C:N ratio of 10:1, so I am also sequestering 100 Kgs N/Ha. That is N that is coming from the plants in the form of root exudates, from biological fixation and fertiliser. Most N rate calculations add in 10 or 20 Kgs N from soil mineralisation, but on my system I have the opposite, I need to take away 100 Kgs N. There is an argument that I should up N rates by 100 Kgs to cover loss to the soil, but of course doing that would mean burning up more OM that I am putting down.</p></blockquote><p></p>
[QUOTE="Simon C, post: 7259687, member: 319"] I am having a real struggle with this idea ATM. Cut N and you stop burning organic matter, cut down other inputs and your OM starts building. I have enough evidence now from 63 OM tests over 20 years to say that I am sequestering about 1 tonne of carbon per hectare a year. But organic matter is not just carbon, it has a C:N ratio of 10:1, so I am also sequestering 100 Kgs N/Ha. That is N that is coming from the plants in the form of root exudates, from biological fixation and fertiliser. Most N rate calculations add in 10 or 20 Kgs N from soil mineralisation, but on my system I have the opposite, I need to take away 100 Kgs N. There is an argument that I should up N rates by 100 Kgs to cover loss to the soil, but of course doing that would mean burning up more OM that I am putting down. [/QUOTE]
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Regenerative Agriculture and Direct Drilling
Regen Ag General Discussion
Biological Brews
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