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Arable Farming
Cropping
fert on w crops
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<blockquote data-quote="ollie989898" data-source="post: 5846198" data-attributes="member: 54866"><p><a href="http://adlib.everysite.co.uk/adlib/defra/content.aspx?id=000IL3890W.16NTC0KI5O22M2" target="_blank">http://adlib.everysite.co.uk/adlib/defra/content.aspx?id=000IL3890W.16NTC0KI5O22M2</a></p><p></p><p><span style="font-size: 18px"><strong><em>Potash leaching</em></strong></span></p><p><em><span style="color: #ff0000">Potassium does not <a href="http://adlib.everysite.co.uk/adlib/defra/content.aspx?doc=95400&id=95995" target="_blank">leach</a> anything like as readily from soils as does nitrate and sulphate</span>. Potash additions not taken up by the crop <span style="color: #ff0000">will be held in the soil by the clay minerals or organic matter as described above</span>. For the great majority of soils, which have <span style="color: #ff0000">a clay content of 5% or more</span>, where normal rates of potash are applied, p<span style="color: #ff0000">otassium not used by the crop will remain in the cultivated layer of soil</span> and will not move further down the profile. However, significant losses of potassium can occur when any source of potash (fertiliser, slurry or manure) is a<span style="color: #ff0000">pplied under adverse conditions</span> i.e. when soil is water-logged, frozen or very dry and deeply cracked. Most of this loss is by surface run-off and can be avoided by following <a href="http://adlib.everysite.co.uk/adlib/defra/content.aspx?doc=252412&id=252439" target="_blank">codes of good agricultural practice</a>. Soils with less than 5% clay (the sands and loamy sands) have a much lower retentive capacity for potassium. Such soils, especially if shallow and subjected to rainfall producing large amounts of through-drainage, have a greater risk of potassium loss. On these soils, potash should be applied 'little and often' and applications timed to suit crop uptake and amounts carefully matched to crop offtake.</em></p></blockquote><p></p>
[QUOTE="ollie989898, post: 5846198, member: 54866"] [URL]http://adlib.everysite.co.uk/adlib/defra/content.aspx?id=000IL3890W.16NTC0KI5O22M2[/URL] [SIZE=5][B][I]Potash leaching[/I][/B][/SIZE] [I][COLOR=#ff0000]Potassium does not [URL='http://adlib.everysite.co.uk/adlib/defra/content.aspx?doc=95400&id=95995']leach[/URL] anything like as readily from soils as does nitrate and sulphate[/COLOR]. Potash additions not taken up by the crop [COLOR=#ff0000]will be held in the soil by the clay minerals or organic matter as described above[/COLOR]. For the great majority of soils, which have [COLOR=#ff0000]a clay content of 5% or more[/COLOR], where normal rates of potash are applied, p[COLOR=#ff0000]otassium not used by the crop will remain in the cultivated layer of soil[/COLOR] and will not move further down the profile. However, significant losses of potassium can occur when any source of potash (fertiliser, slurry or manure) is a[COLOR=#ff0000]pplied under adverse conditions[/COLOR] i.e. when soil is water-logged, frozen or very dry and deeply cracked. Most of this loss is by surface run-off and can be avoided by following [URL='http://adlib.everysite.co.uk/adlib/defra/content.aspx?doc=252412&id=252439']codes of good agricultural practice[/URL]. Soils with less than 5% clay (the sands and loamy sands) have a much lower retentive capacity for potassium. Such soils, especially if shallow and subjected to rainfall producing large amounts of through-drainage, have a greater risk of potassium loss. On these soils, potash should be applied 'little and often' and applications timed to suit crop uptake and amounts carefully matched to crop offtake.[/I] [/QUOTE]
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