engleski

Impacts of liming and PK-fertilization on nutritional status of soil and maize yield

The stationary field experiment was started in spring 2004 on very acid soil by the application of four levels of NPK 10:30:20 fertilizer up to 3748 kg ha-1.The experiment was performed in four replicates and the basic plot size was 77 m2. The third and fourth replicates of the experiment were limed with 10 t ha-1 granulated fertdolomite (24.0 % CaO + 16.0 % MgO + 3.0 % N + 2.5 % P2O5 + 3.0 % K2O) in the November 13, 2007. Mobile fraction of the individual elements in soil (sampling in Sept. 2009) was extracted with NH4-Acetate+EDTA solution (pH 4.65). Liming significantly influenced on soil pH increases for 0.69 and 0.75 units, for pH in H2O and KCl, respectively, as well as decrease of hydrolitical acidity for 2.04 Cmol /kg-1. However, ameliorative fertilization had low effects on these properties. By application of ameliorative fertilization and liming grain yields of maize were in the 2009 growing season significantly increased for 6% and 8%, respectively As affected by the fertilization available P, K and Mg in the soil were increased for 29% and 9%, while the remaining tested elements status (Fe, Mn, Zn, Cu and Cd) was independent on the fertilization. However, liming considerably affected on Ca, Mg and Cd soil status (increases for 75%, 123%, and 36% respectively) as well as K, Zn and Cu status (decreases about 20%), while the impacts on P, Fe, and Mn status were lower.

ameliorative PK-fertilization ; liming ; soil properties ; yield ; maize

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