ASSESSMENT OF POTATO HYBRIDS IN COMPETITION TEST

The article presents the results of testing of promising hybrids in nurseries of competitive testing in the conditions of Central Yakutia for 2017–2018. Ten hybrids that were selected in previous breeding nurseries were tested. All studied hybrids belong to the group of early maturing (55–70 days): 216 (Country × 128-6), 239-1, 239-2, and 239-3 (Ladozhsky x Rosalind), 233, 233-2 (Slavyanka × Rosalind), 237, 237-1 (Northern × Dubrava), 232 (Aurora × Bonus), 234 (Scarlet Sail × Victoria).  Evaluation of hybrids showed that the studied hybrids, according to economically valuable traits, correspond to the model of the variety: early maturing have good biochemical indicators, and in appearance of the tubers correspond to the requirements of consumers (small surface eyes, a mid-depth stolon trace). A description of the morphological characteristics of potato hybrids on tubers carried out. The number and weight of hybrids commercial tubers met the requirements for table varieties. The investigated samples of hybrids had a marketability of 92–97 %, which makes them economically valuable. The samples differed in the content of dry matter (18.4–22.1 %) and starch (9.5–13.4 %). The content of nitrates in tubers did not exceed the permissible concentration. In terms of resistance to the most common diseases in local conditions, it has been established that the samples under study have field resistance to viral diseases, macrosporosis, rhizoctoniosis, and common scab. According to the results of the research, hybrids of potatoes 232 (Aurora × Bonus), 233 (Slavyanka × Rosalind) were selected for further study.