The influence of N and Mg fertilizers and CaCO3 on the absorption of Mg by oats

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Abstract
The effects of applying CaCO3, MgSO4, 7H2O, (NH4)2SO4 and Ca(NO3)2 to the soil on the drymatter yield and Mg absorption of oats at the 4-5-leaf stage were studied in a factorial pot experiment with a Mg-deficient acid sandj soil.Yield of dry matter was increased by all treatments, particularly CaCO3.Applying CaCO3, MgSO4, 7H2O and Ca(NO3)3 generally increased % Mg and total Mg uptake of oats. Applying (NH4)2SO4, which reduced the % Mg in oats growing in the unlimed soil, generally increased % Mg where CaCO3 was also added. The rate of nitrification of NH4, which was slow in the acid soil, was greatly increased by applying CaCO3.