engleski

Impacts of liming and fertilization with phosphorus and potassium on soil status

The stationary field experiment was conducted in spring 2004 on acid soil (pH in KCl = 3.80) of Bjelovar-Bilogora County. The fertilizer NPK 10:30:20 was applied in amounts 416 (a), 1249 (b), 2082 (c), 2916 (d) and 3748 (e) kg/ha, respectively. Nitrogen amount was equilized for all treatments by addition of adequate quantities of CAN (calcium ammonium nitrate: 27% N). The experiment was conducted in four replicates (basic plot 77 m2). In the next years the experiment was fertilized uniformly in level of conventional fertilization. Additional intervention in the experiment was liming of the third and fourth replication by 10 t/ha of granulated fertdolomite (24.0 % CaO + 16.0 % MgO + 3.0 % N + 2.5 % P2O5 + 3.0 % K2O). Soil samples (0-30 cm) were taken in term Sept. 3, 2009. Liming significantly influenced on soil pH increases for 0.69 and 0.76 units, for pH in H2O and KCl, respectively, as well as decrease of hydrolitical acidity for 2.04 Cmol /kg, while humus, AL-soluble P and K were independent on liming. Also, application of NPK fertilizer resulted by considerable increases both AL-soluble P and K (mg/100 g: 11.9 and 19.1 mg P2O5, 15.7 and 20.3 K2O, for the treatments a and e, respectively), while soil pH, hydrolitical acidity and humus contents were similar for all applied treatments. By ameliorative PK-fertilization yields of field crops were increased up to 14 % (maize 2004), 32% (soybean 2005) and 7 % (soybean 2010).

liming ; phosphorus and potassium fertilization ; soil pH ; AL-soluble P and K status

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