METHOD OF DETERMINING FROST-RESISTANCE OF WINTER BARLEY

摘要

FIELD: agriculture.;SUBSTANCE: invention relates to the field of physiology and plant breeding. In the method the seeds are sown in capacities, which are metal boxes, plastic trays and containers. They are frozen in freezers with automatic control of temperature regime, and the extent of frost-resistance is evaluated. In this case, at formation of the third leaf - in the tillering phase the plants are placed in a cooling chamber - showcase for northwarding and maintained at a temperature of 0 to +3°C for 2 days. Then they are transferred to freezers and left for 2 days at a temperature of -5°C. Then the temperature is lowered by 1°C every hour to the critical -12°C-13°C and thawed in the reverse order of 1°C every hour to 0°C. Then two days later the freezers are switched off, the capacities with plants are unloaded and on the third day after unloading the condition of the plants are determined visually according to a 9-point scale, and the frost-resistance in points: 1 - very low, 5 - average, 9 - very high.;EFFECT: method enables to reduce the period of evaluation, to simplify and improve the accuracy of determining the degree of frost-resistance.;4 dwg, 1 ex