Influence of nitrogen and phosphorus content in soil on yield of selected rapeseed varieties

Abstract

There was conducted an experiment to determine the impact of nitrogen and phosphorus content in soil on yield and seed production of selected rapeseed varieties. Field survey was executed on plots of the Plant Production Research Centre – Plant Production Research Institute in Borovce near Piešťany. Soil samples were taken in spring, before the growing season. In homogenized soil samples were determined contents of phosphorus and inorganic-, nitrate- and ammonium nitrogen. The experiment plot was evaluated in terms of basic nutrients content. For examined rapeseed varieties, yield and seed production were determined. The highest sensitive response to the applied fertilization and N, P soil content in spring and consequently the highest yield and seed production has observed in the varieties Labrador (yield 4.68 t ha –1 , seed production 2.46 dkg plant -1 ), Decade (yield 4.45 t ha –1 , seed production 2.66 dkg plant –1 ), Verona (yield 4.10 t ha –1 , seed production 2.28 dkg plant –1 ) and Champlain (yield 4.08 t ha –1 , seed production 2.46 dkg plan –1 ). The most unfavourable results of yield and seed production were reached by the varieties Viking (yield 2.99 t ha –1 , seed production 1.36 dkg plant –1 ) and Baldur (yield 2.88 t ha –1 , seed production 1.43 dkg plant –1 ).