Study on Suitable Planting Density of Different Plant Types of Flue-cured Tobacco Varieties(Lines)in Hanzhong Tobacco-growing Area
To explore the high-density planting suitability of the varieties(lines)with different plant types in Hanzhong tobacco-growing area,field experiments were conducted in Xixiang County,Hanzhong City.Three plant types of Yunyan 99(compact),9A05(semi-compact)and zhongyantexiang 301(flat)were used as experimental materials,and three planting densities(16500 plants/hm2,19500 plants/hm2 and 22500 plants/hm2)were set up,in order to identify the appropriate high-density cultivation for different plant types.The results showed that the growth period of Yunyan 99 in field was shorter than that of 9A05 and Zhongyantexiang 301,and the growth laws of 9A05 and zhongyantexiang 301 were consistent.The incidence of high-density cultivation of the three varieties(lines)was relatively high.Different plant types and planting densities had certain effects on the agronomic traits and fresh and dry weight of roots and leaves.Yunyan 99 was suitable in total sugar,reducing sugar,nicotine,potassium and chlorine.Yunyan 99 had the highest output,output value and proportion of middle and upper smoke.On the whole.If we can solve the problem of diseases in high-density cultivation of tobacco.The compact variety Yunyan 99 is more suitable for high-density cultivation,and the planting density can reach 19500～22500 plants/hm2.The planting density of semi-compact line 9A05 can reach 16500～19500 plants/hm2.The suitable planting density of flattened variety Zhongyantexiang 301 is 16500 plants/hm2,which is not suitable for high-density cultivation.
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