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This study is based on the results of the field experiment carried out in 1990-1992 on the soil of mechanical composition of light loamy sand. The yield and tuber structure of the crop of potato tubers of 37 varieties were evaluated. A positive effect on the crop and mass of the tubers of ϕ 4-5, 5-6 and >6 cm was exerted by the July and August rainfalls, the May and June rainfalls resulted in enlarging...
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