FeSO4/lime mixtures – an alternative to mineral sulfur and lime fertilizer for summer rape

https://doi.org/10.17221/352/2017-PSECitation:Steffens D., Hoffmann J. (2017): FeSO4/lime mixtures – an alternative to mineral sulfur and lime fertilizer for summer rape. Plant Soil Environ., 63: 525-530.
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Sulfur (S) is one of six important macronutrients and due to the strong reduction of atmospheric S, it has to be fertilized to cover the S demand of plants – especially of those with a high S demand. In addition to regular S fertilizers, FeSO4 × 7 H2O was tested as a compound for a new S fertilizer. A pot experiment was conducted in order to test if FeSO4 × 7 H2O, a by-product in TiO2 production from ilmenite (FeTiO3), can be used in mixtures with limestone (CaCO3) or hydrated lime [Ca(OH)2] as an S fertilizer for summer rape (Brassica napus L). The results showed that S fertilization in the form of FeSO4 × 7 H2O/lime mixtures resulted in the same effects on the S and phosphorus (P) availability to summer rape as a gypsum/CaCO3 mixture. Application of S as FeSO4 × 7 H2O/lime mixtures resulted in the same seed yields of summer rapes as compared to S application as a gypsum/CaCO3 mixture. These results indicate that FeSO4 × 7 H2O/lime mixtures can be used as a combined mineral S and lime fertilizer.
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