OSTROSHENKO V.Y.
RUDN Journal of Agronomy and Industrial Animals 2026; 21(1): 9-24
Japanese red pine (Pinus densiflora Siebold et Zucc.) is a rare and endangered species found in the south of Primorsky Krai, having significant economic importance. The high value of the plant and its limited distribution area necessitate measures for protection and active reproduction. In the article, the prolonged effect of two growth stimulants of natural origin (Zircon and HB-101) on biometric indicators of four-year-old seedlings of Pinus densiflora were studied. Seeds of Pinus densiflora, collected from the arboretum of Gorno-Taezhnoye village (Primorsky Krai, Ussuriysky urban district) at the end of 2018, were sown in nursery beds. During the first year, the seedlings were subjected to root fertilization with Zircon at a concentration of 0.01%. In the second growing season, HB-101 stimulator was applied at concentrations of 0.01 and 0.005%, in the third growing season, the stimulants were not used. In the control group the stimulants were not applied. After the end of the fourth growing season, biometric indicators (height, height increment, root collar diameter, root length, and dry weight of plant parts) were measured in seedlings. The study revealed that application of Zircon and HB-101 growth stimulators positively affected biometric parameters of four-year-old pine seedlings. The use of HB-101 at 0.01% concentration was more effective and increased the plant height by 16.8 %, root neck diameter - by 71.4%, root length - by 45.5% and seedling dry weight - by 177.5%, compared to the control group. These results suggest that such seedlings are suitable for use in landscape planting.
