The coefficient of effectiveness ( K e ) of assimilated CO 2 conversion into dry matter of cucumber ( Cucumis sativus L.) plants at the stage of four leaves as dependent on a photoperiod (8, 12, and 16 h) at an irradiance of 220 W/m 2 at the upper leaf level and the combinations of day and night temperatures: typical temperature of plant habitat (background temperature) of 25 ° C and heat-and cold-hardening temperatures (35 and 15 ° C, respectively) was determined in the multifactorial designed experiment. K e reduced insignificantly at shortening of a photoperiod and greater at its lengthening. At background temperatures, K e corresponded mainly to that of carbohydrate synthesis while the presence of cold-hardening temperatures in the thermoperiod increased K e and heat-hardening temperature reduced it.
Key words: Cucumis sativus -photothermoperiod -CO 2 balance -coefficient of effectiveness of assimilated CO 2 conversion into plant dry matter -modelingAbbreviations : K e -coefficient of effectiveness of assimilated CO 2 conversion into plant dry matter; PAR-photosynthetically active radiation.
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