Summary
Crushed basalt and tuff were found to significantly improve the iron nutrition of peanuts grown in pots of highly calcareous soil. At a rate of 1/2% powdered rock (by weight), chlorophyll contents were double those of plants grown in untreated soil. At rates of 5% by weight, the effect of the rock powders was equal to that of FeEDDHA. The effectiveness of the rock powders was lower in the second crop on the same soils.
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Barak, P., Chen, Y. & Singer, A. Ground basalt and tuff as iron fertilizers for calcareous soils. Plant Soil 73, 155–158 (1983). https://doi.org/10.1007/BF02197765
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DOI: https://doi.org/10.1007/BF02197765