Effect of density on photosynthesis and yield in fennel

The self-chosen variety was taken as material to study effects of density on chlorophyll content, seasonal, and diurnal change of photosynthetic rate and transpiration, yield in fennel. The results showed that chlorophyll content of fennel leaf kept a higher level at lower density, then fell down at higher density. Photosynthetic rate and transpiration rate were improved slightly at lower density, and reduced with increasing planting intensity. The single plant yield was high at low density, then decreased with increase of density. The 667 m(2) yield went up at first then dropped down with increasing density. In conclusion, the proper density of fennel cultivation was 4.5 x 10(5) plant/667 m(2) in greenhouse of spring and winter.