engleski

Effects of soil acidity neutralization on phosphorus bioavailability

Soil acidification results with significant soil chemical changes, especially with availability changes of certain macro and micoelements. The aim of this paper was to determine influence of excessive soil acidity neutralization to phosphorus availabilty change. Liming and fertilization experiment was sat up in 20 L volume plastic pots with two types of acid soils with different texture from Donji Miholjac (DM) and Magadenovac (MA) locality in a year 2004. and 2005. In order to neutralize excessive soil acidity, ten liming and fertilization treatments were applied in four repetitions. Liming doses were 7, 5 and 15 t/ha of mischkalk (65% CaO) with calcium carbonate equivalent (CCE) 116, 04 %, and effective neutralizing value (ENV) 82, 56 %. Organic fertilizer doses were 20 and 40 t/ha. Alfalfa cultivar Osječka 66 was sown as indicator plant. Soil was sampled and analysed after first and second year of investigation and plant material was sampled in three cuttings in each year and analysed. Results showed significant increase of soil pH values influenced by liming treatments. Soil acidity neutralization resulted with increment of AL- available soil phosphorus on average 1, 8-4, 9 mg/kg P2O5 per t of applied CaCO3, where phospohrus availability increment per unit of applied liming material was higher for lower liming doses applied and in soils with higher initial level of phosphorus availability. Organic fertilization resulted with phosphorus availability increment of 7, 3-10, 2 mg/kg P2O5 per every 10 t of applied organic fertilizer. Increment of liming rate and organic fertilizer rate showed phospohorus concentration increase in alfalfa leaf and stalk.

liming ; organic fertilization ; phosphorus availability

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