Iron Fertilization of Calcareous Soils in the Greenhouse and Laboratory
1972
Hodgson, J. F. | Neeley, K. L. | Pushee, J. C.
Four crops of corn (Zea mays L.) were grown over a period of 2 years on a calcareous soil supplied with 56-2,200 kg/ha Fe as Fe₂(SO₄)₃. The iron was mixed with the soil and the plants grown for about 6 weeks. The pots remained barren in the greenhouse during periods between crops. All levels of Fe additions improved crop growth with optimum response coming at 186 µg/g and above. There was no appreciable decrease in relative response to the Fe additions with successive cropping. Iron content of the corn plants and the readily extractable phase of iron in the soil both increased following iron supplementation. Iron additions to other calcareous soils, followed by successive wetting and drying in the laboratory, increased the readily extractable Fe in every case, but considerable variation was observed among soils.
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