C - Chemistry – Metallurgy – 05 – B
Patent
C - Chemistry, Metallurgy
05
B
C05B 1/00 (2006.01) C05B 1/02 (2006.01) C05B 3/00 (2006.01) C05B 5/00 (2006.01) C05B 17/00 (2006.01) C05B 19/00 (2006.01) C05B 19/02 (2006.01) C05B 21/00 (2006.01) C05G 1/00 (2006.01)
Patent
CA 2442725
The invention relates to a long-acting phosphorus fertilizer that contains a phosphorus source and an iron source, at least 10% by weight of the phosphorus present in the phosphorus fertilizer being insoluble in water but soluble in neutral ammonium citrate, the phosphorus fertilized being in the form of granules or pellets. The invention additionally relates to a method for fertilizing acid, iron-poor forest soils, wherein a phosphorus fertilizer such as this is spread on the forest soil to be fertilized, the iron present in the fertilizer preventing the phosphorus from being leached out, centrifugal distribution being preferably used.
L'invention concerne un fertilisant phosphoreux à action prolongée qui contient une source de phosphore et une source de fer, au moins 10 % par poids de phosphore dans le fertilisant phosphoreux étant non-soluble dans l'eau mais soluble dans le citrate d'ammonium neutre, le phosphore fertilisé étant sous forme de granulés ou de pellets. L'invention concerne également un procédé de fertilisation de sols forestiers pauvres en fer et acides dans lesquels un engrais phosphoreux tel que celui-ci est répandu sur un sol forestier à fertiliser, le fer présent dans le fertilisant empêche le phosphore de se diffuser. On utilisera de préférence un procédé de diffusion centrifuge.
Lassila Seppo
Poukari Juhani
Ylinen Paula
Kemira Growhow Oy
Russell Reyneke
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