The results of studies on the cultivation of hybrid seedlings in frame area and open ground to increase the efficiency of plum selection in the conditions of the south of Primorye are presented. The plum hybrids obtained from artificial intervarietal hybridization were used as the object of the study. The growth environment conditions affect the growth of the root system and the aboveground part of plum hybrids. Growing plum hybrids in an unheated plastic-covered house improves the quality of seedlings. The biometric indicators (height, stipitate diameter, root system length) of seedlings grown in a greenhouse according to the scheme of 15×7 cm significantly exceeded the open ground indicators. During the growing season, seedlings in the greenhouse grow to the parameters of grade 1 and are suitable for planting in a selection garden. The use of frame area when sowing hybrid plum seeds increases seedling yield by an average of 27.4 % compared to open ground. A promising method of growing plum hybrids in frame area allows improving their quality and speeding up the selection assessment in the garden.

Yakovleva Valentina V.

1. Zhivchikov A. A., Zhivchikova R. I. Vozmozhnosti formirovaniya sovremennogo adaptivnogo sortimenta plodovykh kul'tur v perspektive razvitiya dal'nevostochnogo sadovodstva [Possibilities of creating contemporary adaptive assortment of fruit plants in view of the development of the Far East gardening]. Dal'nevostochnyi agrarnyi vestnik. – Far Eastern Agrarian Herald, 2017; 3: 37–44 (in Russ.).
2. Kazmin G. T. Dal'nevostochnye slivy [Far Eastern plums], Khabarovsk, Khabarovskoe knizhnoe izdatel'stvo, 1966, 326 p. (in Russ.).
3. Kalinina I. P., Burdasov V. M., Morfenko V. L., Kornienko T. F. Vozmozhnost' uskoreniya ontogeneza i otbora gibridov yabloni v teplitse s pomoshch'yu svetokul'tury [The possibility of accelerating ontogenesis and selection of apple hybrids in a greenhouse using light culture]. Proceedings from Physiological and genetic problems of intensification of the breeding process: Vsesoyuznaya konferenciya – All - Union Conference. (PP. 100–102), Saratov, Nauchnoissledovatel'skij institut sel'skogo hozyajstva Yugo-Vostoka, 1983 (in Russ.).
4. Savin E. Z., Mursalimova G. R., Alyaeva O. V. Vyrashchivanie sazhentsev plodovykh kul'tur v zashchishchennom grunte [Growing seedlings of fruit crops in protected soil]. Proceedings from Steppes of Northern Eurasia: VI Mezhdunarodnyj simpozium – VI International Symposium. (PP. 642–645), Orenburg, Gazprompechat', 2012 (in Russ.).
5. Programma i metodika sortoizucheniya plodovykh, yagodnykh i orekhoplodnykh kul'tur [Program and methodology for variety study of fruit, berry and nut crops], Orel, Vserossijskij nauchno-issledovatel'skij institut selekcii plodovyh kul'tur, 1999, 608 p. (in Russ.).
6. Programma i metodika selektsii plodovykh, yagodnykh i orekhoplodnykh kul'tur [The program and methodology for breeding fruit, berry and nut crops], Orel, Vserossijskij nauchnoissledovatel'skij institut selekcii plodovyh kul'tur, 1995, 502 p. (in Russ.).