Study of introduced nut forms in the conditions of the Northern Caspian

A comprehensive assessment of the introduced forms of nuts according to economic and biological indicators is given and the most productive and adapted forms with good fruit quality are identified. The object of research was 32 forms of nuts. The early onset of the main phenological phases is characterized by varieties Xin-2, Ideal SI 1-2, Siebold nut (Tula), Siebold nut (Moscow). The earliest (6.05–8.05) flowering of female flowers was recorded in the forms Saratov ideal SI 1-2, Ideal SI 1-2 and Ideal SI 2-6. Male inflorescences were formed only in three varieties, the earliest flowering of male flowers was noted in the variety Ideal SI 1-2 (2.05). The maximum increase in tree height for the season in 2021 was noted in GF 1, Chili rounded, Ideal, Aral 2 (from 171 to 181 cm). The smallest increments were characterized by pecan DAOD-7, pecan DAOD-9 (4...80 cm). In other varieties and hybrids , the increase significantly varied from 103 to 170 cm . The maximum increase in the diameter of the stem was distinguished by the Elongated varieties (Volgograd), Large-fruited, GF 1 (5.0...5.3 cm). The smallest increments were characterized by pecan DAOD-7, pecan DAOD-9, which ranged from 0.2 to 0.5 cm. The pecan DOD had no increase at all, the other varieties and hybrids had an average increase (1.7...4.8 cm). The maximum productivity value was for the Chili variety elongated and reached 0.563 kg. The average weight of the fetus in the variants was 11.0...20.3 g, the largest mass of the fetus was in the form Ideal SI 2-6 (20.3 g). The largest in height and diameter of the fetus was B1D (Kyrgyzstan) – 5.1 and 3.4 cm, respectively.