We recently purchased some Lawn Food for our grass and as I went to store it I read the packet and am a bit concerned about the following statements:
... It releases essential nutrients to simultaneously promote greening, healthy lawn growth, root development and resistance to stress and fungal disease. It also contains organic ingredients which will break down slowly ensuring lawns receive nutrients for months...
WARNING - Use of this product may result in cadmium and mercury residues in excess of the Maximum Permissible Concentration (MPC) in plant and animal products and may result in accumulation of these residues in soils.
NPK 11-1-5 plus polyacrylamide wetter
Nitrogen (N) as ammonia 8.3%
(N) as organic 2.7%
Total Nitrogetn (N) 11.0%
Phosphorus (P) as water soluble 0.2%
(P) as citrate soluble 0.06%
(P) as citrate insoluble 0.2%
Total Phosphorus (P) 1.0%
Potassium (K) as chloride 4.8%
(K) as organic 0.2%
Total Potassium (K) 5.0%
Sulphur (S) as sulphate 11.0%
Calcium (Ca) 2.0%
Magnesium (Mg) as sulphate 0.3%
Iron (Fe) as sulphate 0.45%
... Apply at a rate of 90 grams over 3 square metres. ... Apply every 3 months except during winter...
Why would it have such a warning? I am now worried that we may have used this brand before... Besides the children running, crawling and playing on the grass I also now have chickens that are allowed to free range there and we are eating the eggs.
Hopefully I am totally paranoid, but would appreciate your opinion on this warning and if anyone knows if it is on *all* fertilisers or just some. For some reason I am thinking that it might be very common on the slow release type ones which I have also used in the past.
Without spending heaps on soil analysis, how worried should I be about the fact these have been used in the past - anyone know how long it takes for Mercury/ Cadmium levels to come back down (if they are up of course) to dissipate *hopefully this is the right sort of context* from soil?