Converter slag as a liming agent in the amelioration of acidic soils
2007
Ali, M.T. (Islamic Azad Univ., Rasht (Iran). College of Agriculture) | Shahram, S.H. (Islamic Azad Univ., Rasht (Iran). College of Agriculture)
Amelioration of acid soils with liming materials is a common practice. Some industrial byproducts are also being used as liming agent. The most important byproduct in amending acid soils is steel making basic slag. In this research, the possibility of rising converter slag, as a soil amendment was investigated in three acid soils. Slag compound contains 52.8% CaO and 12% MgO plus large amounts of other elements such as Fe, P, Si, and Mn. First stage was incubation phase and treatments Were 0,0.5,1,2,4,8 and 16% (w/w) of converter slag kg-1 soil and soil moisture content was adjusted closer to field capacity. The changes in pH, EC and AB-DTPA-extractable Fe, Mn, Zn, P and K were determined after 1, 10, 30 and 60 days. Second phase was a greenhouse study that treatments with due attention to incubation results were determined on maize. Treatments were 0, 0.5, 1 and 2% w/w and 0, 1, 2 and 4% w/w of slag in rice field and tea orchard soils, respectively. Slag increased soil pH and the rate of increase was proportional to the amount of slag used. The slag decreased Fe availability at pH range of 7.4 - 8.5 but increased at higher pH, while use of slag proportionately increased the P and Mn availability. In greenhouse studies the application of 1 and 2% (w/w) of slag in tea garden soil and 0.5, 1 and 2% slag in rice field soil increased plant shoot dry yield mid P and Mn uptake. Fe and K uptake increased in rice field, K uptake decreased in tea garden soil and Fe uptake was not changed. In conclusion, the converter slag was a suitable amendment for acid soils.
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