Effect of Raw Ground Dolomite on Sod-Podzolic Soil Acidity and Yield of Eastern Galega

By now, it has been convincingly proven that liming acidic soils is a leading and traditional measure that, by eliminating excessive acidity, has a positive effect on soil properties and soil microflora. A bacterial one replaces pathogenic fungal microflora. The number of phosphate-mobilizing bacteria, nitrogen fixators, and cellulose-decomposing microorganisms is growing. At the end of the 20th century, scientists proposed to use coarse ground raw ameliorants to reduce the cost of liming acidic soils. They are much cheaper than dusty analogues, are not carried away by wind during application, have prolonged action and are less washed out. To evaluate the effectiveness of the new ameliorant dolomite raw ground coarse grinding, in 2012 at the Menkov branch of AFI was laid a long-term field experiment with eastern galega. Studies have shown that the agrochemical used in the experiment has a prolonged action and can be used for liming acidic soils. The application of raw ground coarse dolomite and multi-purpose compost increased the efficiency of eastern galega during 2015-2018. During all years of the experiment due to fixation of atmospheric nitrogen by nodule bacteria, the additional yield increase of eastern galega at the joint use of KMN with lime at a dose of 6.4 t/ha on its background ranged from 2.2-5.4 t/ha. At application of raw ground dolomite at a dose of 3.2 t/ha the value of additional yield increase of cultivated crop was within 0.8-4.3 t/ha (and only in the first years of eastern galega cultivation). This indicates that a single dose of meliorant did not provide an optimal reaction of the medium for the effective work of nitrogen-fixing nodule bacteria.