Effects of Ridge Type on Growth,Yield and Quality of Flue-cured Tobacco under High-density Cultivation
To explore the effects of high density on yield and quality of flue-cured tobacco under wide-narrow row and large ridge double row,the flue-cured tobacco variety Yunyan 99 was used as experimental materials,and three ridge types(traditional single row,wide-narrow row and large ridge double row)and two planting densities(16500 plants/hm2 and 22500 plants/hm2)were set up.Six treatments were set up as follows:traditional single row and conventional density cultivation mode(CK),traditional single row and high density cultivation mode(T1),wide-narrow row and low density cultivation mode(T2),wide-narrow row and high density cultivation mode(T3),large ridge double row and low density cultivation mode(T4)and large ridge double row high density cultivation mode(T5).The effects of different treatments on agronomic traits,disease incidence,economic traits and chemical components of flue-cured tobacco were studied.The results showed that the ridge type had larger effects on the plant height and stem circumference in the vigorous period,had significant effects on the plant height,stem circumference,maximum leaf width,and maximum leaf area during the dome period.The leaf area coefficients of the three ridge types all significantly increased with the increase of density.Under conventional density,compared with CK,wide-narrow row and large ridge double row promoted the growth of tobacco plants,increased the accumulation of dry matter in leaves,stems and roots,reduced the incidence of tobacco black shank disease,increased the content of reducing sugars and total sugars,coordinated the chemical composition of tobacco leaves,and had a certain effect on improving economic benefits.Under high density,the incidence of tobacco black shank disease was more severe,the total sugar and reducing sugar content were higher,and the quality of tobacco leaves was better in both wide-narrow rows and large ridge double line.However,the yield and output value decreased by 237.00 kg/hm2,17140.35 yuan/hm2,243.00 kg/hm2 and 16061.70 yuan/hm2,respectively.Based on the above results,the overall performance of six treatments is T2＞T4＞CK＞T1＞T3＞T5,so the wide-narrow row conventional density planting mode is more suitable for promotion in Hanzhong area of Shaanxi Province.
Wide and narrow rowBig ridge double rowHigh densityAgronomic traitChemical constituentOutput value
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