Search Results

You are looking at 1 - 10 of 14 items for :

  • Author or Editor: Vlado Kovačević x
  • Biology and Life Sciences x
  • All content x
Clear All Modify Search
Restricted access
Cereal Research Communications
Authors: Josip Kovacevic, Alojzije Lalic, Vlado Kovacevic, and Djuro Banaj

Winter barley were grown under field conditions during the 2004 growing season and residual influences of liming with carbocalk (waste of sugar factory) and phosphorus fertilization with MAP (monoammonium phosphate) were tested. By using the lowest lime rate (15 t ha −1 ) barley yield was increased by 30%. Overliming (90 t ha −1 ) resulted by significant yield decreases in comparison with application 15 and 30 t of lime. Using of 45 and more lime per hectare protein contents was significantly increased. In general, liming considerably influenced on grain composition of barley. For example, by application of the lowest lime rate, grain P, K, Ca, Mg, Fe, Cu, Mo and Na significantly increased in comparison with the control. Differences of grain composition among lime treatments were mainly non-significant. Ameliorative P fertilization significantly increased grain yields of barley up to 25% in comparison with the control. In general, grain composition differences among applied treatments were mainly non-significant because significant differences only for P and Mn (increasing trend due to P application) as well as for Zn and Mo (decreasing trend) were found.

Restricted access

Influences of irrigation rates and N fertilization on soybean grain yield and N leaching were tested under field conditions on Osijek, during the growing seasons 2001, 2003 and 2005 (A). The irrigation started on level of 80% field water capacity, A1 (FWC) and at level of 65% FWC, A2 and irrigate up to FWC, and non-irrigated, A3. Increased rates of N: 0, B1; 100, B2 and 200 kg N ha −1 , B3 were applied. The experiment was conducted by split-plot method. Ebermeier’s lysimeters (open type: 80 × 80 × 10 cm) were conducted for collecting leachate for measuring nitrogen leaching. The soybean grain yield showed statistical very significant differences in growing season, irrigation and interaction of growing season and irrigation. Mean leaching NO 3 -N varied from 0.32 kg N ha −1 to 7.88 kg N ha −1 in year 2001, while were greater in year 2005 and varied form 2.41 kg N ha −1 to 23.71 kg N ha −1 .

Restricted access
Cereal Research Communications
Authors: Vladimir Vukadinovic, Blazenka Bertic, Vlado Kovacevic, Vesna Vukadinovic, and Zdenko Loncaric
Restricted access
Cereal Research Communications
Authors: Marko Josipovic, Vlado Kovacevic, D. Petosic, and Jasna Sostaric

In general, wheat and maize yields in the Brod-Posavina County (BPC) were about 15% lower (10-year means 1981–1990) in comparison with their yields in the region. Wheat yield variations in the region among the years were higher in comparison with maize yield. For example, the highest yield of wheat and maize were higher than the lowest yield for 61% and 34%, respectively. Analogic comparison for Slav. Brod and N. Gradiska municipalities were 78% and 41% (wheat), as well as 41% and 24% (maize), respectively. In the last 8-year period, mean wheat yields in the region were for 17% lower and maize yield for 4% higher in comparison with mean yields of 80ies. These differences in level of BPC were 10% lower and 12% higher, for wheat and maize, respectively. We presume that low or absence effects of tile drainage because of their inadequate servicing could be expalantion for wheat yield decreasing. The lower yields of wheat are mainly in connection with oversupplies of water. However, low maize yields are in connection with water shortage and the higher air-temperatures. Low supplies of P and K are additional factors of low yields of field crops in the hydromorhic soils of the BPC.

Restricted access
Cereal Research Communications
Authors: Života Jovanovic, Ivica Djalovic, Ilija Komljenovic, Vlado Kovacevic, and Milica Cvijović

The field experiment with fertilizer „Njival Ca“ (waste of the Serbian glas factory in Paracin: calcite 98.5% CaCO 3 , granulation <0.1 mm) was conducted in spring 1998 on the Kragujevac vertisol with the treatments as follows (t ha −1 on CaCO 3 basis): 0 (the control), 0.8 and 1.6 (every year), 4.0 and 8.0 (at start of the experiment). The trial was conducted in five replicates and in triplicate for wheat-maize-soybean roration. In general, limiting considerably influenced on yields of the field crops and single application of the high rates are better choice in comparison with repeated use of the low rates. For example, by yield increases in comparison with the control were as follows (comparison single application of 8 t ha −1 and repeated applications of 1.6 t ha −1 ): 29% and 9% (maize), 7% and 3% (wheat), 24% and 9% (soybean), respectively.

Restricted access
Cereal Research Communications
Authors: Ivica Liović, Vlado Kovačević, Miroslav Krizmanić, Anto Mijić, and Branimir Šimić
Restricted access
Cereal Research Communications
Authors: Danijel Jug, Irena Jug, Vlado Kovacevic, Bojan Stipesevic, and Jasna Sostaric
Restricted access
Cereal Research Communications
Authors: Alojzije Lalic, Josip Kovacevic, Gordana Šimić, Georg Drezner, and Vlado Guberac
Restricted access