Combination effect of NPK and plant growth promoting rhizobacteria on edamame soybean growth and yield
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Abstract
The results showed that the combination of treatments had a significant effect on plant height and shoot fresh weight, total number of pods, number of pithy pods, and their weight. NPK application alone (300 kg ha-1) resulted in greater growth than PGPR alone (30 mL L-1) and control plants. Plant height was highest at 300 kg ha-1 NPK but did not differ significantly from 225 kg ha-1 NPK+7,5 mL L-1 PGPR and other combination. The shoot fresh weight was highest at 300 kg ha-1 NPK but did not differ significantly from 225 kg ha-1 NPK+7,5 mL L-1 PGPR and 150 kg ha-1 NPK+15 mL L-1 PGPR. The absence of fertilizer and the use of exclusive application of biofertilizer PGPR led to edamame soybeans with inferior yield. The highest yield was expressed by total number of pods, number of pithy pods, and their weight was produced by 300 kg ha-1 NPK alone and 225 kg ha-1 NPK+7.5 mL L-1 PGPR, but the latter did not differ from 150 kg ha-1 NPK+15 mL L-1 PGPR; and 75 kg ha-1 NPK+22.5 mL L-1 PGPR. The maintenance of edamame soybean growth and yield, enhancement of soil quality, and reduction of chemical residues are shown as all potential outcomes of the incorporation of 7.5 mL L-1 PGPR with 225 kg ha-1 NPK compound fertilizer. These outcomes have the potential to improve soil conditions.
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