Influence of top dressing on yield and seed quality components of oilseed rape

Abstract

Oilseed rape is an agronomically important species grown for seed that contains 40-48% oil and 18-25% proteins. Oilseed rape has high demands for nitrogen. The research was performed on four varieties of oilseed rape (Banaćanka, Valeska, Slavica and Express) developed at Institute of Field and Vegetable Crops in Novi Sad, during vegetative seasons 2007-2008 and 2008-2009. During vegetation, top dressing was applied with different amounts of KAN: control (0 kg N ha-1), 50 kg N ha-1, 100 kg N ha-1, 150 kg N ha-1 and the N quantity determination were performed applying the balancing method (also known as N-min method). Yield, 1000-seed weight, seed germination, oil and protein content were determined after harvest. Yield and seed germination depended on seed production year. 1000-seed weight depended on seed production year and genotype. Oil and protein content in seed depended on production year, genotype and amount of the N-fertilizer applied by top dressing.

Uljana repica je značajna uljana biljka. Ona se gaji zbog semena koje sadrži 40-48% ulja i 18-25% belančevina. Uljana repica je azotofilna biljka. Ispitivanja su izvršena na četiri sorte uljane repice (Banaćanka, Valeska, Slavica i Express) proizvedene u vegetacionim sezonama 2007-2008. i 2008-2009. U toku vegetacionog perioda izvršena je prihrana različitim količinama KAN-a: kontrola (0 kg N ha-1), 50 kg N ha-1, 100 kg N ha-1, 150 kg N ha-1 a na osnovu balansne metode određena je količina azota (Nmin metoda). Nakon žetve utvrđeni su prinos semena, masa 1000 semena, klijavost semena, sadržaj ulja i sadržaj proteina u semenu. Prinos semena i klijavost semena su zavisili od godine proizvodnje. Masa 1000 semena je zavisila od godine proizvodnje i genotipa. Sadržaj ulja i proteina u semenu je zavisio od godine proizvodnje, genotipa i primenjenih količina azota u prihrani.