公开(公告)号：DE19820297A1

公开(公告)日：1998-12-03

申请号：DE19820297

申请日：1998-05-07

Applicant: BASF AG

Inventor： RUNGE FRANK DR ,  PFAU ANDREAS DR ,  HORN DIETER DR ,  ERHARDT KLAUS DR ,  HORCHLER V LOCQUENGH KLAUS DR ,  STADLER REINHOLD DR

IPC: C05G3/00 ,  C05G3/10 ,  A01C21/00

Abstract: A novel encapsulated fertiliser granulate (I) is obtained by applying to a starting fertiliser granulate (II) aqueous solutions containing (a) a polyelectrolyte (PE) and (b) oppositely charged polyvalent ions (MI). Also claimed is a fertilisation method involving applying (I) to agricultural land. Preferably PE has a solubility in water, at 20 deg C and pH 1-14, of at least 0.1 g per litre. MI consists of alkaline earth metal, zinc, aluminium or iron ions; and/or a second polyelectrolyte (PE') having the opposite charge to PE. PE and MI are especially both bio-polymers. (II) is optionally further treated with (c) a polyfunctional compound (V) which reacts with PE or MI to form at least two bonds, during or in combination with application of (a) and (b); and/or (d) an aqueous dispersion of an optionally salified copolymer if 75-90 wt.% ethylene and 10-25 wt.% alpha -olefinically unsaturated 3-8C carboxylic acid, before or in combination with application of (a) and (b), specifically such that the amount of copolymer is 1-50 wt.% based on PE and MI.