Use of compositions for the co-formulation of seeds and / or propagules comprising seeds, isoform nuclei and a non-bactericidal and / or bacteriostatic liquid formulation, contacted so that said liquid formulation can loosely and transiently adhere the seeds to the nuclei isoforms； • the isoform cores are of approximately the same size, weight, mass and shape as the seeds thus dispersed linearly in a row in the seed line or, more advantageously, on the fly at the surface of the soil by centrifugal dispersion, • the isoform cores are contacted with the liquid formulation either by spraying, coating, film-coating, impregnating and / or any recognized method and so that the isoform cores and the seeds once contacted can now adhere to one another transiently so, without this retention itself can withstand a mechanical and / or centrifugal force exerted at the time of application of said composition in situ, in the field, either on the fly at the surface of the ground, or in band within or near the furrow line, • the isoform cores are thus rendered partially and transiently adhesive so as to loosely retain one or a few seeds perturban Thus, their dispersions during sowing, • the seeds are previously contacted, coated and / or otherwise filmed with fertilizing phosphatic salts, and • the ratio between the number of seeds and such isoform nuclei and is between 25: 1 and 5: 1, but preferably about 10: 1. Utilisation de compositions pour la co-formulation de semences et/ou propagules comprenant des semences, des noyaux isoformes et une formulation liquide non bactéricide et/ou bactériostatique, mis en contacte afin que ladite formulation liquide puisse faire adhérer lâchement et transitoirement les semences aux noyaux isoformes ； • les noyaux isoformes sont approximativement de mêmes tailles, poids, masses et formes que les semences ainsi dispersées linéairement en rang dans la raie de semis ou, plus avantageusement, à la volée à la surface du sol par dispe
