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Turkish Journal of Agriculture and Forestry

DOI

10.55730/1300-011X.3135

Abstract

The objective of this paper was to determine the effects of rapeseed genotype and nitrogen fertilization for dual purposes, i.e., on seed yield for human consumption and on the quantitative and qualitative value of harvested residues as feedstock to produce heat energy. The research was carried out in field trials set up under the agroecological conditions of northwestern Croatia at the University of Zagreb’s Faculty of Agriculture in the vegetation periods of 2012/2013 and 2013/2014. The research included three rapeseed genotypes (conventional hybrid SY Cassidy, cultivar Komando, and semidwarf hybrid PR45D03) and three nitrogen topdressing rates that included the supply of soil mineral nitrogen. Nitrogen treatments were N1 (without topdressing), N2 (applying the nitrogen difference from the fertilizer to 150 kg N ha–1 to the soil with one topdressing), and N3 (applying the nitrogen difference from the fertilizer to 200 kg N ha–1 to the soil with two topdressings). During both vegetation periods, the highest seed yield was achieved by the conventional hybrid SY Cassidy. In 2012/2013, the highest stalk yield, silique residue yield, utilizable biomass, and energy biomass yield were achieved by the conventional hybrid SY Cassidy and the cultivar Komando. By applying up to 200 kg N ha–1 with two topdressings (N3), the utilized biomass yield and energy biomass yield were increased, but only in the extremely humid 2013/2014 vegetation period. The effect of rapeseed genotype and nitrogen topdressing on stalk combustion properties were mainly dependent on weather conditions. The conventional hybrid SY Cassidy and cultivar Komando had the most favorable combustion properties of rapeseed stalks during both vegetation periods. Topdressing with a higher nitrogen rate had mostly positive effects on the combustion properties of the rapeseed stalks, especially for conventional hybrid SY Cassidy in the 2013/2014 vegetation period.

Keywords

Biomass yield, combustion properties, genotype, nitrogen topdressing, rapeseed, seed yield

First Page

894

Last Page

906

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