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Arable Farming
Cropping
P and K
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<blockquote data-quote="ollie989898" data-source="post: 5891150" data-attributes="member: 54866"><p>You will not get a difference in soil test results regardless of the time of year they are done or the temperature of the soil/air. It is true that the availability of soil phosphate to plants varies with temperature, but that won't fool a mass spectrometer: it's either there or it isn't. That assumes of course you are sending the soil to a lab that actually uses a mass spectrometer.</p><p></p><p>I used to do soil samples all year round virtually, a LOT are done immediately post harvest for obvious reasons.</p><p></p><p>How many acres are we talking and what were the results as indices? Very low P needs sorting, TSP is the usual weapon of choice for that, but you could use another product if the K was low as well.</p><p></p><p>Slurry/muck should be targeted on to fields with recognised issues, use it to replace the K removed with grass crops.</p><p></p><p>If the area is large enough then fibrophos might be worth using, don't go mad with it on fields already high with K though as you won't see a return on that.</p><p></p><p>EDIT: your careful use of 0.0.60 is probably what is holding the K values up. You could probably buy in a few bags of TSP and use 250kg/ha of that to bring the worst fields right on P.</p></blockquote><p></p>
[QUOTE="ollie989898, post: 5891150, member: 54866"] You will not get a difference in soil test results regardless of the time of year they are done or the temperature of the soil/air. It is true that the availability of soil phosphate to plants varies with temperature, but that won't fool a mass spectrometer: it's either there or it isn't. That assumes of course you are sending the soil to a lab that actually uses a mass spectrometer. I used to do soil samples all year round virtually, a LOT are done immediately post harvest for obvious reasons. How many acres are we talking and what were the results as indices? Very low P needs sorting, TSP is the usual weapon of choice for that, but you could use another product if the K was low as well. Slurry/muck should be targeted on to fields with recognised issues, use it to replace the K removed with grass crops. If the area is large enough then fibrophos might be worth using, don't go mad with it on fields already high with K though as you won't see a return on that. EDIT: your careful use of 0.0.60 is probably what is holding the K values up. You could probably buy in a few bags of TSP and use 250kg/ha of that to bring the worst fields right on P. [/QUOTE]
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