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EVALUATION OF PRODUCTIVITY AND DROUGHT TOLERANCE OF OIL-SEED FLAX (Linum usitatissimum L.) VARIETIES DEPENDING ON THE CONDITIONS OF HUMIDIFICATION AND MINERAL NUTRITION IN THE SOUTH OF UKRAINE

Published in AgroLife Scientific Journal, Volume 9, Number 1
Written by Raisa VOZHEHOVA, Vira BOROVYK, Vira KONOVALOVA, Serhii KOKOVIKHIN, Iryna BILIAIEVA, Pavlo LYKHOVYD, Olena PILIARSKA, Iryna BIDNYNA

The goal of the study was to determine drought tolerance of varieties of oil-seed flax and to improve its cultivation technology through the optimization of mineral nutrition in dependence on soil humidification with connection to the changes of climate in the South of Ukraine. To achieve the goal we performed three-year field experiment with the crop in regard to the design of the study, and investigated such factors as variety (Evryka, Orfei, Vira), mineral nutrition background (N0P0, N45P60, N60P60, N90P60), soil humidification conditions (irrigation, rain-fed). The maximum yields were provided by the variety Evryka (2.36 t ha-1) in the irrigated conditions, and the variety Vira (1.47 t ha-1) in the nonirriga edconditions at the application of N90P60. The best yield of oil was provided by the variety Vira (0.97 t ha-1 and 0.57 t ha-1 with the application of N60P60 in the irrigated and non-irrigated conditions, respectively). The main indices of drought tolerance, namely, mean productivity (MP) - 1.30, yield stability index (YSI) - 0.55, yielding index (YI) - 106, stress tolerance index (STI) - 0.47, revealed that the variety Vira was the best one among the studied varieties of oilseed flax. Multiple linear regression analysis revealed general tendency to the increase in oil-seed yield by 6.431 kg with the increase of irrigation rate by every 1 mm; by 4.548 kg per every 1 kg ha-1 of Nitrogen fertilizers; by 1.228 kg per every 1 kg ha-1 of Phosphorus fertilizers, respectively.

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