1. A method of increasing a plant's resistance to abiotic stress, comprising applying a composition comprising Bacillus pumilus and / or Bacillus subtilis to a plant, to a part of a plant, and / or to a site near a plant or part of a plant, where Bacillus pumilus is selected from the group including B.pumilus QST2808 and a mutant B.pumilus QST2808, a Bacillus subtilis is B.subtilis QST713.2. The method of claim 1, wherein the resistance to abiotic stress is resistance to salt stress or resistance to nutritional deficiency. The method of claim 2, wherein the salt stress resistance is salt tolerance or drought tolerance. The method according to claim 2, wherein the plant's resistance to nutrient deficiency is increased as a result of solubilization of nutrients or stimulation of siderophore production in the soil area near the plant or part of the plant. The method of claim 4, wherein solubilizing the nutrients improves their bioavailability by at least about 5%. The method of claim 4, wherein the solubilization of the nutrients is selected from the group consisting of solubilization of potassium, solubilization of phosphate or solubilization of iron due to binding to siderophore, as well as combinations thereof. The method of claim 6, wherein the application is preceded by determining that the soil contains low concentrations of one or more nutrients selected from the group consisting of potassium, phosphate, and iron. A method according to any one of the preceding claims, wherein the composition further comprises at least one carrier. The method according to any one of paragraphs. 1-7, further comprising introducing at least one other active ingredient into the composition. The method according to any one of paragraphs. 1-7, where the active ingredient is a chemical substance or1. Способ повышения устойчивости растения к абиотическому стрессу, включающий в себя нанесение композиции, содержащей Bacillus pumilus и/или Bacillus subtilis, на растение, на часть растения,
