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APPLICABILITY OF Cu AND Zn HYDROXOSALTS AS SOURCES OF MICROELEMENTS FOR GROWING LETTUCE (Lactuca sativa L.). I. METHODOLOGICAL APPROACH

Summary. Copper and zinc are vitally important nutrient elements, but are also potential soil polluters. More promising forms have to be found, in which these microelements could be presented to the plants. The aim of this investigation was to modify the method of water cultures in such a way that the concentration of copper and zinc hydroxosalts could be controlled in order that their qualities as sources of microelements could be compared to the simple salts of sulphur acid. Vegetation pot experiments were conducted with the synthesized hydroxyde carbonates and hydroxyde sulphates of Cu and Zn in water cultures using the lettuce cv. Zhulta Gyumyurdzhinska. The hydroxosalts of Cu and Zn are equivalent sources of microelements and as compared to simple salts stimulate the root’s growth. Hydroxyde carbonates are better as a source of Zn and hydroxyde sulphates – as a source of copper.