An effect of powdered carbonate rocks on greenhouse vegetables grown on peat medium
1997
Jaervan, M.
In Estonia there are carboante rocks with a different content of Ca and Mg, the powdered production wastes of which can be used for neutralizing the growth media produced from bog peat, and for supplying plants with a sufficient amount of Mg. The effect of powdered limestone, powdered dolomite and their mixtures 1:1 and 1:3, as well as oil-shale ash on the growth, yield and chemical composition of lettuce, tomato aand cucumber was compared. The rate of a lime fertilizer was 8 kg per cubic metre of peat. It became evident that a too broad or a too narrow Ca:Mg ratio in lime fertilizers inhibited the growth of plants and decreased the yield. The Mg content in dolomite powder had a positive effect on the synthesis of leaf pigments. The use of limestone and dolomite powders for neutralizing the peat medium increased the yields of lettuce and cucumber, and improved the taste of tomato
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