Response of Pulses to Seed or Soil Application of Rhizobial Inoculants

Abstract

In micro-plot experiments growth, nodulation and seed yields of pea, yellow lupine and soybean grown in a soil colonized by high populations of pea and lupine rhizobia and low population of soybean rhizobia as influenced by seed or soil application of rhizobial inoculants were studied. The studied inoculation method had no significant effects on root nodule numbers, plant growth at the flowering stage and on seed yields of pea and yellow lupine in comparison to uninoculated control treatments. In the case of soybean seed and soil inoculation with soybean rhizobia (Bradyrhizobium japonicum) resulted in a significant increase of nodulation intensity, fresh and dry mass of shoots at the flowering stage as well as pod numbers and soybean seed yields at harvest. Soybean grown on plots in which soil was inoculated with the symbiotic bacteria gave seed yield by about 57 % higher as compared to that of soybean grown from seed inoculated with the rhizobia and by 169 % higher than when this crop was grown on the control (uninoculated) plots.

Influence of Seed Inoculation with Commercial Bacterial Inoculants (Bradyrhizobium Japonicum) on Growth and Yield of Soybean

“…In 2017, the number of seeds per pod was higher compared with 2018. Martyniuk et al (2018) also did not confirm the effect of inoculation with symbiotic bacteria on the number of seeds in the pod. In 2017, 1000 seed weight was not modified by the bacterial inoculants used.…”

“…However, it should be noted that the inoculant Nitragina was not very effective in 2017 and Nitrazon in 2018. Martyniuk et al (2018), after applying seed inoculation with rhizobia, obtained an average of 4.9 nodules per root. However, after applying a bacterial inoculant to the soil, they obtained an average of 12.3 nodules per root.…”

“…In 2018, the most pods per plant were obtained after the use of HiStick® Soy and Nitragina. Kozieł et al (2013) and Martyniuk et al (2018) report that a significant increase in the number of pods on the soybean plant is obtained under the influence of inoculation of seeds with symbiotic bacteria. In contrast, Htwe et al (2018) did not show the effect of bacterial inoculants on the number of pods per plant.…”

“…The obtained increase in seed yield was 23% compared with the control. The study by Martyniuk et al (2018) shows that inoculation of seed with symbiotic bacteria results in a significant increase in soybean yield. The obtained yield gain was higher when the rhizobia were applied to the soil.…”

“…A beneficial feature of soybean is its ability to associate with rhizobia bacteria in its root nodules to fix atmospheric nitrogen through symbiotic nitrogen (N) fixation (Thilakarathna and Raizada, 2017). Therefore, an important procedure in soybean cultivation is the inoculation of seed with symbiotic bacteria Bradyrhizobium japonicum (Jarecki et al, 2016;Martyniuk et al, 2018). As a result of this treatment, a high seed yield can be obtained with no or limited nitrogen fertilization of soybean plants (Zuffo et al, 2018).…”