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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