Compositions and methods are described for improving the growth of plants.In one example, the compositions contain bacteria Bacillus amyloliquefaciens and at least a lipoquitooligosac u00e1rido (LCO)And can be applied to the plant or Seed to improve Growth and / or performance.In one example, the improvement in the growth of the plants is more than Additive in comparison with the application of the LCO or bacteria alone.Claim 12: a method of improving Plant Growth of corn, which comprises: a) applying to a seed of corn, or expose a seed of corn,A composition that includes an isolated and Biologically Pure Culture of Bacillus amyloliquefaciens or SPOREs of Bacillus amyloliquefaciens; and (b) apply to seed cornOr expose the seed corn, a composition which comprises at least an LCO.The Method of claim 20: agreement with the demand 19Where the Improvement of Corn plant growth includes an increase in dry weight of Roots, Shoots and / or the corn Plant; an increase in dry weight of the Seedling of maize, an increase in the length POf Roots or Shoots of Corn Plant; an increase in the average number of Roots or Shoots produced by Corn Plant; an increase in the frequency of seed germination of maize;Or a decrease in the time it takes to germinate seed corn with respect to plant Corn or Maize Seed control.Se describen composiciones y métodos para mejorar el crecimiento de plantas. En un ejemplo, las composiciones contienen bacterias Bacillus amyloliquefaciens y al menos un lipoquitooligosacárido (LCO), y se puede aplicar a la planta o semilla para mejorar el crecimiento y/o rendimiento. En un ejemplo, la mejora en el crecimiento de las plantas es más que aditivo en comparación con la aplicación de las bacterias o LCO solo. Reivindicación 12: Un método de la mejora de crecimiento de planta de maíz, que comprende: a) aplicar a una semilla de maíz, o exponer una semilla de maíz a, una composición que incluye un cultivo aislado y biológicamente puro de Bacillus amyloliquefaciens