Study On Selecting Of Adapt Varieties In Lijiang Of Yunnan

In present,,there are some problems in Lijiang tobacco production,including varieties having degradation trends,the trend of pests and diseases increasing,the quality of the upper leave being poor,and so on.the screening studies of flue-cured tobacco varieties suitable for Lijiang was studied among 2005 to 2007,and different fertilizer allocated proportion test was researched in 2007.The main results were as follows:1.Evaluating the 10 flue-cured tobacco varieties(Hongda,NC82,K358,G28,Yunyan 317,K326,V2,K346,RG11,Yunyan 85 for control)in lijiang regional test of 2005 and 2006 by gray relational analysis,indicated the relational grade of Yunyan 85,Yunyan 317,K326 and K358 in all the varieties tested was the relatively large in eight characters,combined, Combined the results of smoking,the overall performance of yunyan85 and yunyan317 was the best.2.The results of PVH19 regional test in 2006 showed that:Plants of PVH19 grow rather uniformly in the field and have strong growth potential.The leaf is ellipse shape With moderate angle between leaf and stalk.The leaf color is the light green to green.Days needed for staying in the field from being transplanted to being harvested is 110d,and shorter 10days than yunyan87.PVH19 was a representative early maturity variety.The survey results of field natural incidence showed that PVH19'resistance to the black shank,brown spot,powdery mildew and TMV was superior to yunyan87,especially for powdery mildew and TMV.The outlook quality of tobacco leaf of PVH19 was better,but single-leaf weight slightly lower than yunyan87.PVH19 was suitable to grow in Lijiang area with short growing season of,high-altitude.3.Although the performance of Yunyan 85 Yunyan 317 is better in 2005 and 2006 in Lijiang flue-cured tobacco varieties compared test,these varieties can not solve the Lijiang tobacco production problems.In 2007 the new varieties of flue-cured tobacco comparison test has conducted in Lijiang different ecological zones.The results showed that:Yunyan 203 and Yunyan 202 have strong adaptability,followed by 201 Yunyan,Yunyan Yunyan 85 and 87 have weak adaptability. 4.Results of different fertilizer allocated proportion test of two flue-cured tobacco vatieities in 2007 showed that:(1) The best fertilizer rate of PVH19 was N_6.5:P_5.5:K_19.5, Yunyan 203 was N_5.5:P_5.0:K₂₄.(2) PVH19 was a representative early maturity variety,with strong fertilizer response,high resistance,easier management,easier baked,but leaves the less oil,low Yield,PVH19 was suitable to grow in high-altitude area.Yunyan 203 is a late-maturing variety,with the advantage of strong resistance,but the variety was weak fertilizer response,difficult to baking,It is suitable to grow in area with high incidence of TM V and black shank.Yunyan 203 should strict control of nitrogen application rate and increase appropriate use of fertilizer.this study showed that PVH19 replace Yunyan 85 and Yunyan 87 was suitable to grow in Lijiang area,Yunyan 203 is suitable to grow in area with high incidence of TM V and black shank.