Tula regional agrochemical laboratory

USSR. Tula. Agrochemists R. Vasyukova and G. Trifonova (left to right) during the determination of the content of potassium and phosphorus in the soil during the analysis of soils of one of the region's agricultural enterprises, on the basis of which a cartogram is compiled and recommendations for the application of fertilizers are issued. Petr Maslov/TASS