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The aim of the paper is to study the effects of auxin and cytokinin, synthetic growth regulators, on selected parameters of hybrid alfalfa and red clover nutritional value. The experiment was conducted at the experimental facility of Siedlce University of Natural Sciences and Humanities between 2014 and 2016. In the autumn of 2014 plastic cylinders with no bottom, 40 cm high and with the diameter of 36 cm, were sunk 30 cm deep into the ground, with spacing of 0.8 × 0.8 m. They were filled with the soil of the anthropogenic order. Experimental factors: plant species hybrid alfalfa and red clover, growth regulator control (distilled water), indole-3-butric acid (auxin), 6-benzyloaminopuryn (cytokinin), indole-3-butric acid + 6-benzylaminopuryn. After plants in each cylinder were harvested their chemical analysis was carried out. Dry matter digestibility (%) and total protein, crude fibre concentration in dry matter (g kg) was determined with the NIRS method using the Buchi NIRFlex N-500 spectrometer. The results of the multi-factor experiment with 24 experimental units were processed statistically using repeated measures analysis of variance. Growth regulators affected the content of protein and crude fibre in plant matter in different wayes. Cytokinin and a mixture of hormones reduced the concentration of protein relative to the control, but fibre share increased. Auxin had no significant effect on these features.

THE EFFECT OF SYNTHETIC GROWTH REGULATORS ON SELECTED PARAMETERS OF MEDICAGO X VARIA T. MARTYN AND TRIFOLIUM PRATENSE L. NUTRITIONAL VALUE