Effect of the sowing norm and nitrogen fertilization on the yield from dry bean (Phaseolus vulgaris L.) cultivar Blyan
Gencho Milev1 • Ruska Dimitrova2
1Dobrudzha Agricultural Institute – General Toshevo
2Technical University - Varna
Резюме
During 2016 – 2018 a field trial was carried out with the new cultivar Blyan in the trial field of Dobrudzha Agricultural Institute on slightly leached chernozem soil. The aim of the investigation was to find out the optimal sowing and nitrogen norms for this cultivar under the conditions of the slightly leached chernozem soil in Dobrudzha region. Five sowing norms were tested: 20, 27, 34, 41 and 48 germinating seeds per m2, as well as four variants of nitrogen fertilization: 0, 40, 80, and 120 kg/ha against phosphorus background of 60 kg/ha. The trial was designed according to the split plot method, with four replications of the variants, the size of the harvest plot being 12 m2. The sowing norm of 41 g.s. / m2 was found most efficient with regard to yield from cultivar Blyan. Nitrogen fertilization increased seed yield. The rate of increase being highest with the lowest nitrogen norm - N40P80. The subsequent increase of the sowing norm did not go together with the same rate of yield increase. Thousand seed weight reached a maximum as early as the first sowing norm (20 g.s. /m2) and fertilization norm N120P80. The conditions of the respective year had strongest effect on two investigated indices. Highest yield was obtained during the first year of the investigation (2016), i.e. the year with optimal conditions for expression of the biological potential of cultivar Blyan. However, the weight of 1000 seeds is highest during the worst year (2018), i.e. dependence is inversely proportional to yield.
