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Effects of photoperiod temperature and vernalization on flowering and growth in high latitude populations of red clover

, : Effects of photoperiod temperature and vernalization on flowering and growth in high latitude populations of red clover. Norwegian Journal of Agricultural Sciences 3(2): 201-210

Seedlings were grown for two to five months at 8-h and 24-h photoperiods and at three or five temperature levels of between C and C. Both shoot and root growth are on average from two to four times greater at 24-h, and the effect is most pronounced at low temperatures. Ecotypes from 71 and N are more stimulated by the longer photoperiod than the ecotype from N. Low temperature is favourable for dry matter production because of the low rate of phenological development and thereby increases stem and leaf formation. Only plants grown at long-day periods flower. The highest proportion of flowering plants is found at low temperatures, and in the southernmost ecotype. An increase in temperature from C to C accelerates flowering considerably. Vernalization enhancement of plant growth and development in one of the two experiments, has ultimately been considered as spurious.


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