Published in Scientific Papers. Series A. Agronomy, Vol. LX
Written by Nicoleta CĂPĂȚÂNĂ, Ciprian BOLOHAN, Doru Ioan MARIN
The research was conducted over two agricultural years 2014/2015 and 2015/2016, and aimed to assess the influence of mineral fertilization and seed inoculation with nitrogen fixing bacteria Bradyrhizobium japonicum on soybean grain yield. The research was based on a split plot experiment placed on a chromic luvisoil, which was previously cultivated with maize. The results presented in this paper were obtained by analyzing the following factors: Factor A – soybean varieties from different maturity groups: Adsoy, Orion, Carla, Darina, PR92B63; Factor B – mineral fertilization levels N0P60K0 (Control), N0P60K0 + foliar fertilization; N45P60K0; N45P60K0 + foliar fertilization; N45P60K45; N90P60K45; Factor C – soybean seeds inoculated with Nitragin Bac Soya (Bradyrhizobium japonicum); soybean seeds non-inoculated with Nitragin Bac Soya (Bradyrhizobium japonicum). The average grain yield of the soybean varieties was 1898.5 kg/ha, varying from 1319.80 kg/ha (Orion) to 2483.43 kg/ha (PR92B63), for variants where the soybean seeds were inoculated with Bradyrhizobium japonicum. In variants were soybean seeds weren’t inoculated with nitrogen - fixing bacteria the average grain yield was 1829.80 kg/ha, varying from 1277.41 kg/ha (Orion) to 2483.43 kg/ha (PR92B63). Mineral fertilization generated a grain yield increase of 30.2%. Seed inoculation with nitrogen fixing bacteria brought an increase of the grain the yield of 3.76%.
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