Abstract: The present invention relates to a method for improving a soil structure by stabilization of aggregates. According to the invention it is applied to the soil a graft polymer substantially free of monomer, having an intrinsic viscosity below 1 dg/l and a molecular weight below 100,000. The graft polymer is obtained by the exothermic reaction of a water soluble lignosulfonate with a member selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof. The graft polymers have been found to be also useful as binding reagents for agglomerating single particles of particulate materials.The graft polymers according to the invention are obtained in the form of an aqueous solution, which may be transformed into a powder by spray drying. As soil conditioners they may be applied by spraying, alone or admixed with fertilizers or pesticides and also combined with the operation of planting and soil stabilization.

Abstract: The present invention relates to a method for improving a soil structure by stabilization of aggregates and to the reagents used therefor. The reagents used are graft polymers obtained from crude lignosulfonate and monomer selected from the group consisting of vinyl cyanide (acrylonitrile), vinyl acetate, hydrolized vinyl acetate and acrylamide or combinations thereof, at a pH range of between 2 and 6 in the presence of an initiator.The reagents obtained according to the invention are true solutions and are characterized by their low viscosity. They can be used in solution, emulsion or suspension either by spraying alone or admixed with fertilizers, pesticides or combined with the operation of planting and soil stabilization.The reagents can be easily manufactured, being stable for prolonged periods of time. They possess outstanding properties as soil conditioners.