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2022, № 6 (54) |
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GENERAL AGRICULTURE, PLANT GROWING
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Skipin L.N., Dyukova N.N., Loginov Yu.P. |
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The number of nodule bacteria of alfalfa with varying degrees of salinity of the nutrient medium |
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It was revealed that nodule bacteria reacted negatively to the alkaline reaction of the nutrient medium. This reaction was created with the participation of normal and bicarbonate of soda. The toxicity of bicarbonate and normal soda was 4-10 times higher than that of neutral salts. The predominance of soda in the composition of neutral salts (sulfate-soda salinization) increases their toxicity in comparison with the neutral type by 2.3-3.5 times. Neutral types of salinization, represented by one or several salts with the participation of sodium and magnesium at low concentrations (0.3-0.8%), had a favorable effect on the vital activity of nodule bacteria in nutrient media. At a salinity level of 2-3%, they are able to completely suppress the growth and development of nodule bacteria. The presence of calcium gypsum in the composition of easily soluble salts increased the resistance of microorganisms to increased salt concentration by 7.5 times in comparison with sulfate-soda salinization.
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