# The Fertilisers (Amendment) Regulations 1995, Schedule 4


“
NK fertilisers containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde (as appropriate)
Product obtained chemically without addition of organic nutrients of animal or vegetable origin and containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde.
Containing by weight:—
1 not less than 5% nitrogen (N)
2 not less than 5% potassium oxide (K2O)
The sum of the two nutrients must be not less than 18% by weight.
At least 25% of the declared content of total nitrogen must derive from crotonylidene diurea, or isobutylidene diurea or urea formaldehyde.
At least 60% of the declared nitrogen content from urea formaldehyde must be soluble in hot water
Nitrogen (N)
Amount of:—
total nitrogen;
amount where equal to or greater than 1% weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen;
nitrogen, where appropriate, from
1 crotonylidene diurea or
2 isobutylidene diurea or
3 urea formaldehyde;
nitrogen from urea formaldehyde that is soluble only in hot water;
nitrogen from urea formaldehyde this is soluble in cold water.
Potassium Oxide (K22O)
Potassium oxide soluble in water. The indication ‘low in chlorine’ is linked to a maximum content of 2% chlorine (Cl). Chlorine content may be declared
”

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Source: https://www.legislation.gov.uk/uksi/1995/16/schedule/4 (the official version)
Page: https://openlegislation.uk/fertilisers-amendment-regulations-1995/schedule-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.