| Nanxiongof Guangdong is a subtropical monsoon humid areas, with continental climate, four seasons. The annual average temperature of 19.6 degrees, annual rainfall of 1555.1 millimeter, 1852.4 hours of sunshine, frost free period of 293 days. The purple soil of Nanxiong basin, potassium rich, can adapt to the cultivation of tobacco, and suitable for planting flue-cured tobacco. The content of organic matter, total nitrogen and available nitrogen in purple soil is relatively lower, but the content of potassium and magnesium is relatively high. Accordingly, Nanxiong City Tobacco Monopoly Bureau to Nanxiong purple soil sloping land development by highly flavored type characteristics of leaf development as a breakthrough. The quality of flue-cured tobacco was the best in the purple soil of Nanxiong, Shaoguan. But due to the difference of soilstructure in purple soil and uneven rainfall and evaporation is high, often appear seasonal drought, which restricts the uptake of potassium of flue-cured tobacco, which has seriously affected the formation of Guangdong Nanxiong tobacco yield and quality.In this study, a pot experiment was conducted in Guangdong Province, province, South China Agricultural University atfebruarytojuly of 2014. The experimental materials were based on “yue yan 98”. The test was designed with two factors and three levels. Main area is the irrigation factor A,Light drought(A1):( relative soil water content(Wr) is 50%~60%),Limited irrigation(A2):(relative soil water content(Wr) is 60%~70%),Full irrigation(A3):(relative soil water content(Wr) is 70%~80%). The secondary zone is the fertilization factor B,(B1)Per plant applypure fertilizer N 9.2g ? P2O54.6g ? K2 O 12.88 g,(B2)Per plant applypure fertilizer N 9.2g?P2O54.6g?K2O 18.40 g,(B3)Per plant applypure fertilizer N 9.2g?P2O54.6g?K2O 23.92 g.There were 9 treatments, each treatment was repeated 3 times. On the condition of non full irrigation of flue-cured tobacco plant height, stem girth, leaf area, yield and main chemical components and irrigation limits and other aspects of the study, the main results are as follows:1?Mutual factor, directly influence the yield of flue-cured tobacco in the non full irrigation water potassium coupling condition, the plant height, stem girth, leaf area coefficient were 0, 0.246270,0, extended root of plant height and leaf area of the stem girth of flue-cured tobacco yield components have indirect effect and the indirect influence coefficient were 0.232423, 0.039697, other pairwise effect of indirect influence coefficient were 0. Comprehensive analysis showed that tobacco at root extending stage structure and yield of the main factors of the stem circumference, followed by plant height and leaf area.The irrigation level was 50%-60%(relative soil water content) and the amount of potassium fertilizer was per plant 23.92 g, and the irrigation level was 70%-80%(relative soil water content)and potassium fertilizer application was per plant 12.88 g and 23.92 g, which was beneficial to the accumulation of dry matter of flue-cured tobacco. Taking into account the extension of the light drought is conducive to the growth and development of flue-cured tobacco roots, so the extension of irrigation levels for the 50%-60%(relative soil water content) and the amount of potassium fertilizer for the 23.92 per plant is the best combination of irrigation and potassium application level.2?Under non sufficient irrigation water potassium coupling condition, Wang long-term flue-cured tobacco plant height, stem girth, leaf area on Yield Composition of direct influence coefficient were 0.526052,-0.000001, 0.433945, Wang Long apart from stem girth of the plant height, leaf area on Flue-cured Tobacco Yield and composition of have indirect influence coefficient according to 0.394350, 0.047603,outside, the other interaction of two factors mutual indirect effect coefficient were for 0. Comprehensive analysis showed that the main factors of the yield of flue-cured tobacco in the flourishing and long-term structure were the plant height, the next leaf area, and the last. The combination of irrigation level of 70%-80%(relative soil water content) and potassium application amount of 23.92 gper plant was in favor of the formation of flue-cured tobacco vigorous and long-term plant height, that is, the combination of irrigation and fertilization was the best irrigation and potassium application level.3?Effects generated by Stem girth, respectively, were in the non full irrigation water potassium coupling condition, it is concluded that mature plant height, stem girth, leaf area on yield of direct influence coefficient-0.000001, 0.051229, 0.572458 mature period of except plant height and leaf area of the stem girth of flue-cured tobacco yield no indirect effects, the other two factor interaction of indirect influence coefficient were plant height, leaf area of the stem girth of indirect effects 0.023041, 0.009890,height stem leaf area were 0.020176, 0.110512, Considering the economic benefits is the final flue-cured tobacco total and planting cost, maturity of the most appropriate irrigation amount of potassium fertilizer irrigation level is 60%-70%(relative soil water content) and the amount of potassium was 12.88 g per plant.4?Through the determination of the total sugar content in three different parts of flue-cured tobacco leaves at maturity, the total sugar content in different parts was not consistent. Considering the leaf area is main factors of yield components,high quality tobacco total sugar content reached 18%- 22%, tobacco upper, middle and lower three parts of tobacco overall containing sugar content of the coordination of the three factors can be seen in irrigation level is 60%- 70%(relative soil water content) and potassium application amount for 12.88 g per plant strains to produce high quality tobacco leaves.Through the determination of nicotine content in three different parts of tobacco leaves, the content of nicotine in different parts was not at the same level. Is generally believed that the high quality tobacco nicotine content required to achieve 2.2%-2.8%. Production of throughout the middle and lower three different leaf positions nicotine content and the final can draw irrigation level 70%~80%(relative soil water content) and the amount of potassium 12.88 g per plant strains combination conducive to production of high quality flue-cured tobacco.Through the determination of potassium content in three different parts of tobacco leaves, the potassium content in different parts of different parts can be seen. Overall trend, upper leaves > middle leaf > lower leaves, the overall coordination of the best is T8 treatment, which corresponds to the irrigation application and K combination for irrigation level is 70% ~ 80%(relative soil water content)and potassium amount for 18.4g per plant strain combination, the processing the upper leaf kalium content reached the highest value was 2.08%, breaking the 2.0%.5, combine the mature period of the agronomic characters of flue-cured tobacco, totalsugar, nicotine and potassium content, yield and irrigation and fertilization costs to carry on the analysis, obtained in mature stage of flue-cured tobacco is the most appropriate irrigation potassium is a combination of irrigation level of 60%~70%(relative soil water content) and potassium rates as a combination of 12.88 g per plant strains. |
PDF Full Text Request