Breathable superabsorbant agrogranule, useful for absorbing and storing water or aqueous solution for supplying dissolved elements e.g. nitrogen, to crop, comprises mixture of proteinic biopolymers and polysaccharidic biopolymer
Breatheable superabsorbant agrogranule having a dry matter rate of 92-95%, comprises: a mixture of 55-60% of proteinic biopolymers, rich in globulines, albumins, prolamins and fibers, consisting of protein vegetable matters including sunflower, soya, colza, alfalfa and flax, and 40-45% of polysaccharidic biopolymer, rich in starch, hemicelluloses and pectins, consisting of seed flours of cereals or sugar beet pulp； and 5-40% of natural tissue or hyaline hydrocysts cells from living plant material including Sphagnum or Carduus thistle. An independent claim is included for preparing the breathable superabsorbant agrogranule, comprising: mixing the proteinic biopolymers and polysaccharidic biopolymers after crushing； adding the natural tissue or hyaline hydrocysts cells after crushing； introducing the solid mixture in an extrusion device； introducing a process liquid, in which a sulfite salt and glycerol are dissolved to obtain a mixture of matters including 10-45% of water； processing the mixture at a temperature of 80-120[deg] C in the extrusion device； then undergoing operations of malaxation, plasticization and plastic material formation under a pressure followed by cutting in a wished gauge； steaming in a tunnel under an air flow at a temperature of 40-55[deg] C for 30 minutes to obtain the gauged agrogranule； and drying up to 92-95%.La présente invention concerne des agrogranulats respirants superabsorbants obtenus par un procédé de fabrication à base de l'association d'une part d'un mélange de polymères naturels natifs protidiques et polysaccharidiques, et d'autre part d'un composant de structure fait de tissus naturels de cellules hyalines ou hydrocystes à forte capacité de réserve d'eau. Lesdits agrogranulats respirants superabsorbants sont destinés à stocker des éléments hydrosolubles certes nutritifs pour les cultures, mais potentiellement polluants pour les eaux, afin de les libérer de manière contrôlée selon les besoins des plantes et dans la mesure de leu
