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Arable Farming
Cropping
Zero till may not be as environmentally friendly as we thought.
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<blockquote data-quote="SilliamWhale" data-source="post: 6917684" data-attributes="member: 1232"><p>To be honest we don't know where the data is from. I havent read it all or the sources.</p><p></p><p>Its not that there are "two sides" so much as understanding what is really happening. </p><p></p><p>N20 will increase in more anaerobic soils. That is the case whether the soil is no tilled, tilled or grass etc. I would wager the more N that is put on the more potential there is for N20 emissions. In fact I don't even know if there are N20 emissions from legumes or not - surely there are.</p><p></p><p>Consider ths scenario: If two farmers grew a crop of spring barley side by side and farmer A decides to leave his all winter before ploughing and seeding spring rape and farmer B decides to drag his no till drill through and plant winter rape is farmer B emitting more N2o than farmer A? </p><p></p><p>Scenario 2 - The whole of the growing season they both churn out decent crops. Everyone happy. Both don't think they have compaction etc. This time farmer A decides to fully invert tillages and plant winter wheat but then flooded out, farmer B got coronavirus at Groundswell and couldn't harvest his OSR until september and decides to leave a stubble and then plants spring wheat instead. </p><p></p><p>The point is N20 will fluctuate within both those fields all the time. Its too complicated to say no till = more N20. </p><p></p><p>The other part of the article which is odd is the comparing carbon:</p><p></p><p>There is a higher concentration of OM in the top 10cm of the no till field but levels drop after that. But then says there is more carbon in the ploughed when you bury the residue under 20cm! So its an admission that the top 5-10cm is where you build the carbon! Naturally there is going to be less OM the lower down the soil profile you go if carbon gets built at the interface between soil life and the sun. </p><p></p><p>Honestly saying there is more carbon 20cm down when you physically plough residue it down is like me ploughing in a crop of wheat the day before harvest and saying "look, this wheat can grow underground as well"!</p></blockquote><p></p>
[QUOTE="SilliamWhale, post: 6917684, member: 1232"] To be honest we don't know where the data is from. I havent read it all or the sources. Its not that there are "two sides" so much as understanding what is really happening. N20 will increase in more anaerobic soils. That is the case whether the soil is no tilled, tilled or grass etc. I would wager the more N that is put on the more potential there is for N20 emissions. In fact I don't even know if there are N20 emissions from legumes or not - surely there are. Consider ths scenario: If two farmers grew a crop of spring barley side by side and farmer A decides to leave his all winter before ploughing and seeding spring rape and farmer B decides to drag his no till drill through and plant winter rape is farmer B emitting more N2o than farmer A? Scenario 2 - The whole of the growing season they both churn out decent crops. Everyone happy. Both don't think they have compaction etc. This time farmer A decides to fully invert tillages and plant winter wheat but then flooded out, farmer B got coronavirus at Groundswell and couldn't harvest his OSR until september and decides to leave a stubble and then plants spring wheat instead. The point is N20 will fluctuate within both those fields all the time. Its too complicated to say no till = more N20. The other part of the article which is odd is the comparing carbon: There is a higher concentration of OM in the top 10cm of the no till field but levels drop after that. But then says there is more carbon in the ploughed when you bury the residue under 20cm! So its an admission that the top 5-10cm is where you build the carbon! Naturally there is going to be less OM the lower down the soil profile you go if carbon gets built at the interface between soil life and the sun. Honestly saying there is more carbon 20cm down when you physically plough residue it down is like me ploughing in a crop of wheat the day before harvest and saying "look, this wheat can grow underground as well"! [/QUOTE]
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Zero till may not be as environmentally friendly as we thought.
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