Open Access
Table 1
Effect of PABA and “Nikfan” biopreparations on nitrogen-fixing ability of clover.
| Experiment options | Number of active nodule per plant, pcs. | Regrowth after mowing the herbage, cm | Correlation coefficient, r1, between regrowth and number of nodules | Accumulation of biological nitrogen in the soil, kg/ha | Leaf protein content, % | Correlation coefficient between protein content and number of active nodules, r2 |
|---|---|---|---|---|---|---|
| Control (without biopreparations) | 38 | 1.28 | 0.67 | 95.8 | 18.8 | 0.72 |
| Inoculation with the 348 strain | 46 | 1.46 | 0.79 | 138.5 | 19.1 | 0.76 |
| Pre-sowing treatment in the PABA aqueous solution | 54 | 1.76 | 0.82 | 153.6 | 19.6 | 0.78 |
| Pre-sowing treatment in the “Nikfan” aqueous solution | 59 | 1.85 | 0.91 | 174.3 | 20.1 | 0.80 |
| Pre-sowing treatment by PABA + “Nikfan” | 72 | 1.92 | 0.92 | 186.8 | 20.8 | 0.88 |
| Pre-sowing treatment with a biopreparations mixture + foliar fertilizing 10-15 days after germination | 92 | 2.10 | 0.94 | 218.6 | 21.2 | 0.90 |
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