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Arable Farming
Cropping
fert on w crops
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<blockquote data-quote="ollie989898" data-source="post: 5846232" data-attributes="member: 54866"><p>You can apply P and K fairly freely unless you are on sandy or very thin soils or doing something daft when it is water logged or flooded. P and K (and a lot of other elements) are bound very strongly to the soil colloids, they will not re-enter solution freely, but you can lose them if those soil particles are in fact leaving the field via water running over the surface and carrying them away. If that were the case you would not probably be attempting to travel on the land. You must also be very careful on highly acidic soils where a lot of elements behave very differently.</p><p></p><p>I used to regularly get customers to apply P or K to land destined for winter cereals in the autumn, either in the form of organic manures, slurries or as TSP/MOP or 0.24.24. DAP also has a place, too but obviously it contains nitrogen which is a different beast.</p><p></p><p>It should be said of course that none of the above should be applied unless prior knowledge of the land indicates the need for these nutrients or you have a recent soil test as you could waste a lot of money very quickly for no appreciable improvement in crop yields.</p><p></p><p>I am convinced P and K levels were key to overwinter survival of many crops, particularly legumes and grasses.</p></blockquote><p></p>
[QUOTE="ollie989898, post: 5846232, member: 54866"] You can apply P and K fairly freely unless you are on sandy or very thin soils or doing something daft when it is water logged or flooded. P and K (and a lot of other elements) are bound very strongly to the soil colloids, they will not re-enter solution freely, but you can lose them if those soil particles are in fact leaving the field via water running over the surface and carrying them away. If that were the case you would not probably be attempting to travel on the land. You must also be very careful on highly acidic soils where a lot of elements behave very differently. I used to regularly get customers to apply P or K to land destined for winter cereals in the autumn, either in the form of organic manures, slurries or as TSP/MOP or 0.24.24. DAP also has a place, too but obviously it contains nitrogen which is a different beast. It should be said of course that none of the above should be applied unless prior knowledge of the land indicates the need for these nutrients or you have a recent soil test as you could waste a lot of money very quickly for no appreciable improvement in crop yields. I am convinced P and K levels were key to overwinter survival of many crops, particularly legumes and grasses. [/QUOTE]
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fert on w crops
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