Effects Of Soil PH And Different Control Measures On Tobacco Bacterial Wilt Status

Soil p H is an important indicator of soil physical and chemical properties, soil p H can affect soil microbial activity, plant, soil mineral elements absorption activity and other related factors. In this paper, measuring the dynamic changes in the field of tobacco systematic growth of the field of p H, p H analysis of the dynamic changes of tobacco field, tobacco bacterial wilt health survey, study and analysis of tobacco bacterial wilt and soil p H existing relationships. By measuring the dynamic changes in soil p H, the use of analytical methods Diseases Epidemiology of plant diseases prevalent correlation analysis to determine the initial onset of tobacco bacterial wilt and Tobacco p H dynamic correlation. By regression analysis, regression equation and the dynamic changes of soil p H tobacco bacterial wilt. Establish tobacco bacterial wilt disease index correlated with soil p H change. The paper identified the bacterial wilt incidence correlated with the p H initial time dynamic changes, the establishment of a different age condition tobacco bacterial wilt and soil p H logarithmic regression equation. At the same time explores the application of different soil p H and soil acidification amendments on tobacco bacterial wilt improving effect. By screening soil acidification effect modifier, reasonably complex administration, explores the effect of improving the use of modifiers in composite soil acidification under different soil p H and improvement measures on tobacco bacterial wilt.1. Dynamic Change of Soil p H Determination of the dynamic changes of soil p H dynamics of soil p H tobacco fields, respectively 2013--2015 Nian Peng Hydra River Tobacco ginkgo Ping test the dynamic measurement of p H tobacco fields. Dynamic Change of Soil p H in tobacco presented back to the fluctuations, but can get the overall trend showing a rise in soil p H decrease and then rise slowly leveled off in the last four stages. Tobacco in the survey area of soil p H 5.41±0.47. Tobacco Field Soil p H dynamics studies can visually obtain tobacco plant rhizosphere soil p H change.2. The correlation between tobacco bacterial wilt and soil p H between changes The relationship between tobacco bacterial wilt and soil p H changes in soil p H between tobacco bacterial wilt disease index and correlation analysis. Pretreatment soil p H, soil p H exponential accumulation to give the onset time of the index accumulated soil p H greater than 20. At the same time explores the disease index and soil p H index accumulated correlation between the amount obtained regression equation index accumulated amount of tobacco bacterial wilt and soil p H between.Respectively y = 4.6189ln(x) + 40.222(R2 = 0.9132); y = 3.5214ln(x) + 44.884(R2= 0.9359); y = 7.4994ln(x) + 48.242(R2 = 0.9299). Obtained correlation cumulative change in the index disease index and soil p H between tobacco bacterial wilt.3. lime, ash, dolomite effect on improving soil p H and tobacco bacterial wilt explored lime, ash, dolomite when administered Tobacco on Soil p H and the effect of improving tobacco bacterial wilt. Using 75 kg / acre processing tobacco fields, in addition to ash, the dolomite and lime on soil p H has a significant effect of improving to the best quicklime, dolomite Secondly, the ash is relatively weak. But hold on a time-efficient, better than dolomite quicklime. Lime, dolomite, ash control effects were 47.4%, 24.6% and 8.4%. Amendments doubled in soil acidification process, the application rate of 150 kg / acre when. Lime, dolomite and relative control effect of ash was 49.4%, 49.3% and 39.6%. Under conditions of application rate doubled, the ash effect on tobacco bacterial wilt lift maximum control effect to enhance 37.14%.4. Composite soil acidification Modifiers on Soil p H and tobacco bacterial wilt under conventional composite soil acidification kriliums using quicklime + humus effect is relatively good, can effectively delay the onset of tobacco bacterial wilt,enhance quicklime on tobacco bacterial wilt, while improving quicklime improving effect on soil p H.