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김영용(Y . Y . Kim),김충국(C . K . Kim),김시주(S . J . Kim),강병화(B . W . Kang) 한국농림기상학회 2002 한국농림기상학회지 Vol.4 No.1
This experiment was conducted to investigate the effect of night illumination on the growth and yield of wheat and barley. Three varieties of barley and four cultivars of wheat were tested under the different night illuminance which was controlled in the range of 1.2~20 Lux during whole growth season at night. As night illumination was stronger, the culm length of all varieties tended to be shorter. The shortening was greater in barley than wheat. Node number, awn length and culm diameter tended to decrease as the light intensity was stronger. Internode length above the 4th and 5th node was remarkably decreased by the stronger illuminance. The degree of decrease in spike length affected by the night illuminance was much larger in the late-maturing variety among wheat cultivars. As night illumination was stronger, days to heading was shortened in general. The range of decrease was 2 to 10 days under 10~20 Lux condition similarly in both barley and wheat. Effect of night illumination on heading date and days from initial heading to full heading was not considerably different between the crops and among varieties except Kangbori. Night illumination decreased the grain yield by 12.5% in barley, and 11.0% in wheat at 2.1~5.0 Lux condition, and 34.6% in barley, and 29.3% in wheat at 10~20 Lux condition compared to control. Yield reduction was significantly different among varieties, being greatest in Kangbori among barley varieties, and in Chokwang (late-maturring variety) and Changkwang (late-maturring variety) among wheat varieties. It was interpreted that the decrease of grain yield was resulted from the decrease in the number of spikes and the number of grains per spike under the stronger night illumination. The decrease of grain yield was more directly attributed to the decrease in the number of grains per spike.