Paragraph 4 CHOICE OF TREATMENT TO BE USED
Preliminary remark: if the product is suitable, only a representative part of the final sample need be kept.
Final samples which must not be ground
Calcium nitrate, calcium magnesium nitrate, sodium nitrate, Chile nitrate, calcium cyanamide, nitrogenous calcium cyanamide, ammonium sulfate, ammonium nitrates of over 30% N, urea, basic slag, natural phosphate rendered partially soluble, precipitated dihydrated dicalcium phosphate, calcined phosphate, aluminium calcium phosphate, soft ground rock phosphate.
Final samples which must be divided and part of which must be ground
These are products in respect of which certain determinations are carried out without previous grinding (fineness of grinding for example) and other determinations after grinding. They include all compound fertilisers containing the following phosphate ingredients: basic slag, aluminium calcium phosphate, calcined phosphate, soft ground rock phosphate and natural phosphate rendered partially soluble. To that end, divide the final sample into two parts, which are as identical as possible, using a sample divider or by quartering.
Final samples in respect of which all determinations are carried out on a ground product
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These are all the other fertilisers on the list which are not to be found under 4.1 and 4.2. The whole final sample shall be ground.