Prodn. of a compsn. for treating Ca deficiency in plants without risk of blight comprises mixing several calcium salts with trace elements. The compsn. is sprayed on the leaves. Pref. the compsn. contains: (a) Ca(NO3)2, (b) CaCl2, (c) CaSO4, (d) CaOAc, (e) 'Solubor C', (f) MnSO4, (g) CuSO4, and (h) a complex buffer.
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