engleski

Influences of liming on field crop yields and plant available zinc status in soil

Field experiment with increased rates of carbocalk (waste of Osijek Sugar Factory: 34.4% Ca, 6.33% humus, pH = 9.53, plant available zinc determined by Ammonium Acetate – EDTA extraction = 38.5 mg Zn kg-1) were conducted in term November 8, 2000 on arable land of Kutjevo Agricultural Holding (Pozega-Slavonian County). Soil is characterized as a stagnic albeluvisol (FAO Classification) of Ap-E/E-Btg-C profile. Carbocalk treatments were as follows (t ha-1): 0, 15, 30, 45, 60 and 90. The field trial was conducted in four replicates (experimental plot of fertilization 64.26m2 = 8.4 x 7.65m). Soil samples were taken from each plot (July 24, 2004 ; total 24 mean samples) by auger up to 30 cm of depth. Mean sample contained 15 individual samples. Mobile soil fractions of zinc was extracted by Ammonium Acetate – EDTA solution (pH 4.65). In general, liming with carbokalk resulted with considerable increases of field crop yields. For example, as affected by liming yields were increased up to 50% (maize), 36% (maize), 38% (sunflower) and 30% (barley), for the 2001, 2002, 2003 and 2004 growing season, respectively. As affected by applied treatments pH (1n KCl) was increased from 3.89 (the control) to 7.30. At the same time, available Ca increased from 568 to 4736 mg Ca kg-1. Increasing of soil pH values reduced considerably plant available zinc concentrations in the 0-30 cm soil layer. However, differences in mobile zinc concentrations in soil among liming treatments were non-significant. In general, Zn concentrations in grain of winter barley were low and differences among liming treatments were non-significant. However, P:Zn ratio considerably increased due to liming mainly due to increased P concentrations.

carbocalk ; liming ; plant available zinc ; soil ; yield ; maize ; sunflower ; barley

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