Abstract. Purpose: to study the effect of the Ribav-Extra plant growth regulator on the biometric parameters of clonal pear rootstocks and quince varieties.
Materials and methods. The study was conducted in 2025. During the study, experimental studies on assessment of rooting on clonal pear rootstocks and quince varieties were conducted. Cuttings were treated with and without the growth regulator.
Results. Based on the results of the studies, it was found that the best rooting results when treated with the plant growth regulator Ribav-Extra (1.0 mg/10 l, for 18 hours) (from 85.3 to 89.7 %) were pear clonal rootstocks PG 12 (k), PG 17-16, PG 2, PG 333, OHF 333. Without the use of plant growth regulator, the highest rooting ability (from 73.8 to 78.5 %) was shown by clonal pear rootstocks PG 12 (k), PG 17-16, PG 2, PG 333. When treating the cuts with the plant growth regulator Ribav-Extra (1.0 mg/10 l, for 18 hours), the highest rooting (from 82.3 to 87.9 %) was shown by Penzenskaya, Provanskaya, VA 29 (k), Severnaya quince forms. Without the use of plant growth regulator, the best rooting rates (from 70.8 to 77.6 %) were demonstrated by the Penzenskaya, Provanskaya, VA 29 (k), and Severnaya quince varieties. It should be noted that the greatest growth height, the greatest number of roots, and the longest root length were demonstrated by the clonal pear rootstocks PG 12 (k), PG 17-16, PG 2, and PG 333, as well as the Penzenskaya, Provanskaya, VA 29 (k), and Severnaya quince varieties when treated with the Ribav-Extra plant growth regulator (1.0 mg/10 l, for 18 hours) and without the use of plant growth regulator.
Conclusions. The Ribav-Extra plant growth regulator had a positive effect on clonal pear rootstocks and quince varieties.
plant growth regulator, pear, quince, rootstock, rooting ability, greenhouse
Zatsepina I. V. Using the Ribav-Extra plant growth regulator on the biometric parameters of pear clonal rootstocks and quince varieties. Ways of Increasing the Efficiency of Irrigated Agriculture. 2025;97(3):267–281. (In Russ.).
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