Abstract
Growth responses of alfalfa plants to temperatures combined with light-intensity and air-humidity were tested. Plant height, branch number, leaf number and total dry weight were greater under strong light and high-humidity than under weak-light and low-humidity, respectively. The optimum temperature for dry matter production was 25/20°C or 20/15°C. Top/root ratios were higher under weak-light, hight-humidity and high temperature compared with the respective opposite conditions. Nitrogen accumulation had a strong correlation with dry matter production (r=0,988), showing 35 mg increase in dry matter per lmg nitrogen increment. TAC accumulation of whole plant was greatest at 20/15°C, and that of stubble and roots was greater under strong-light and low-humidity, predicting a better regrowth under these conditions.
