Soybean (Glycine max (L.) Merr.) is an annual plant that belongs to the Fabaceae or Leguminosae (legume) family. It is known for its protein-rich grain and is also an oleiferous plant or oilseed with around 20% fat in the seed. Before the beginning of the experiment, soybean seeds were inoculated with two different concoctions of Rhizobium japonicum bacteria (Biofixin, Nitragin) to increase soybean yield. The second factor in the experiment was the addition of zeolite flour, or the biostimulant Amalgerol Essence and/or mineral nitrogen. Zeolite flour is of Slovenian origin and has the capacity for water retention. Amalgerol Essence is registered as a liquid organic fertiliser intended to protect plants during stressful production situations and, strengthen their root system. A pot experiment was carried out in the greenhouse at Biotechnical Faculty in Ljubljana in 2020. We studied the effect of seed inoculation, the use of zeolite, Amalgerol, and the nitrogen fertilisation of plants during the growing period and on crops. We used half of the grown plants for the nodule analysis and found out that most of the nodules developed when treated with zeolite flour added to the substrate before the sowing and when treated with nitrogen. We used the remaining half of the plants in the end to determine morphological characteristics and yield. We found out that the inoculated seed with Biofix with added nitrogen and zeolite has the best influence on the yield and plant. In treatments, where we used Amalgerol Essence, we found out that it is best to use an inoculated seed and no nitrogen fertilisation.
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