# The Fertilisers Regulations 1991, Paragraph 9

Extent: E+W+S

In the case of fluid fertilisers, additional information on the fertilising components may be expressed in equivalent terms of weight versus volume (kilograms per hectolitre or grams per litre). In the case of fluid fertilisers which are for foliage spraying, the soluble calcium content may be declared if it is not less than 8% calcium oxide (5.7% calcium).
TABLE 1
(a). MINIMUM TRACE ELEMENT CONTENT (PERCENTAGE WEIGHT OF FERTILISER)
1. Applied to the soil
2. Leaf Spray
a) Crops or grassland
b) Horticultural use
Boron (B)
0.01
0.01
0.01
Cobalt (Co)
0.002
–
0.002
Copper (Cu)
0.01
0.002
0.002
Iron (Fe)
0.5
0.02
0.02
Manganese (Mn)
0.1
0.01
0.01
Molybdenum (Mo)
0.001
0.001
0.001
Zinc (Zn)
0.01
0.002
0.002
b). MINIMUM SECONDARY NUTRIENT CONTENT (PERCENTAGE WEIGHT OF FERTILISER)
2% magnesium oxide (MgO) ie 1.2% Mg.
3% sodium oxide (Na2O) ie 2.2% Na.
5% sulphur trioxide (SO3) ie 2% S.
TABLE 2
CHELATING AGENTS FOR TRACE ELEMENTS
Name
Abbreviation
Chemical Symbols
Sodium potassium or ammonium salts or acid salts of:
ethylene diamine tetraacetic acid:
EDTA
C10H16O8N2
diethylene triamine pentaacetic acid:
DPTA
C14H23O10N3
ethylene diamine — di (O-hydroxyphenyl acetic) acid:
EDDHA
C18H20O6N2
hydroxy-2 ethylene diamine triacetic acid:
HEEDTA
C10H18O7N2
ethyldiamine-di (O-hydroxy P-methyl phenyl) acetic acid
EDDHMA
C20H24N2O6
ethylene diamine di (5-carboxy -2hydroxyphenyl) acetic acid
EDDCHA
C20H20O10N2

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Source: https://www.legislation.gov.uk/uksi/1991/2197/schedule/2/paragraph/9 (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-1991/schedule-2/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.