Effect of amelioration measures on the decrease of mobile aluminium in acid soil as a prerequisite for maize growing
2001
Boskovic-Rakocevic, Lj.
Studies were carried out on pseudogley, distinguished by extremely acid soil reaction (pH in KCl prior to setting up of the trial was about 3.5 pH units) and high mobile aluminium content (37.9-41.7 mg/100 g of soil). To overcome these problems, a field trial was set up with eleven treatments, by using different rates and combinations of bentonite, zeolite, crude phosphates, lime and MgO. The ameliorants were applied each year, at the same rates, immediately before sowing. The trials lasted three years, and maize was used as a test plant. The application of most ameliorative measures resulted in the reduction of all forms of soil acidity: active, substitutional and hydrolitic, the best effect being achieved with the combination CaO + MgO, in the 5:1 ratio. The application of most amelirative measures led to the increase of humus and N contents, as well as of available contents of P, K, Ca, Mg, Zn and Cu, whereas the available soil Mn and Fe contents decreased. The elimination of toxic effect of aluminium in the soil enabled better uptake of nutrients from the soil, which, coupled with terrain heterogeneity, affected the variations in concentration of these nutrient in maize leaves and kernels. The obtained maize kernel yields show the full justification of ameliorative measures, since the maize yield was on average increased by 2.7-47.3%.
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