engleski

Influence of plant growth regulator and rhizobial inoculation on nodulation and soybean nitrogen contant

Sustainable agriculture production greatly relies on the use of renewable resources of nitrogenous reserves and rational nitrogen fertilization. The inoculation of cultivated leguminous plants with selected rhizobial strains is recommended to maximize the contribution of biological nitrogen fixation to the nitrogen status of the host plant. Considering that symbiotic fixation is dependent on the photosynthetic capacity of the specific legume, special efforts have been taken to find patterns of increasing plant photosynthetic capacity. The main aim of the present study was to evaluate the influence of Bioalgeen-S90 as a growth regulator and soybean inoculation with different B. japonicum strains on nodulation and soybean nitrogen and protein content in agroecological conditions of eastern Croatia. At location Karanac application of Bioalgeen-S90 significantly increased nodule number, nodule dry weight and seed protein content compared to plots without Bioalgeen-S90 application. Statistical analysis showed superior effect of inoculation, irrespective of the strain used, compared to to control uninoculated plots for all measured properties. Significant influence of inoculation with B. japonicum strain USDA 110 on nitrogen content in stem and ureide content in xylem were determined compared to plots inoculated with strain D344. At location Mirkovac application of Bioalgeen-S90 significantly increased nodule number, ureide content in xylem and seed protein content compared to plots without Bioalgeen-S90 application. Inoculation with strain D344 significantly increased nodule number and nodule dry weight, ureide content in xylem and nitrogen content in soybean aerial parts compared to variants inoculated with strain USDA 110 and control variants.The results of this study clearly showed the positive effect of growth regulator Bioalgeen-S90 and rhizobial inoculation on nitrogen status of host plant. However, further investigations under different agroecological conditions are needed.

soybean; plant growth regulator; bradyrhizobial strains; nodulation; nitrogen contant

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