The influence of sowing date and nitrogen fertilization on spring rape productivity

Leidinio DOI: https://doi.org/10.7220/1822-9913.2020The main objective was to analyze the influence of sowing date and nitrogen fertilization on the productivity of spring oilseed rape. The research was carried out in 2019 in the farm of Benas Krisciunas, a farmer in Kriukai village, Sakiai district. The soil is sandy. There was a two factor field experiment. Experiment variants – factor A – sowing date: 1) Sowing 1: 2019-05-07; 2) Sowing 2: 2019-05-14; 3) Sowing 3: 2019-05-21. The factor B of the experiment – fertilization: 1) performs at a minimum rate (120 kg ha-1 ); 2) at the maximum rate (250 kg ha-1 ). Used Axan NS (27 4) fertilizer once after last sowing date. Delaying the sowing time of spring rape from 7 May. until May 21st the average number of pods per plant did not differ significantly. The lowest (166 units) when was sown on May 7th, the week after first sowing was the highest (229 units), and the latest on May 21st. sown – slightly lower compared to May 14th. sowing. Increasing the rate of nitrogen fertilizers, the tendency of the number of pods was increased. The influence of sowing time had no significant influence on the mass of 1000 seeds. One week of sowing delay, the mass of 1000 seeds of spring rape increased, and the delay of one week remained the same as that of the second sowing (respectively 1.08 g, 1.13 g and 1.13 g). Increasing the nitrogen fertilizer rate significantly increased the mass of 1000 seeds of spring rape from 1.00 g to 1.23 gAgronomijos fakultetasVytauto Didžiojo universiteta