Effects Of Sulphur Nutrition Regulatory On The Growth And Quality Traits Of Flue-cured Tobacco

In order to ascertain the interrelationships between soil Sulphur and the qualityof tobacco, we combined the field experiment and sample in the tobacco-growing areas of Luohe,Using GPS positioning selected232soil and tobacco samples during2011to2013. Put thezhongyan-100as the test material. The irrigation frequency and dose of sulfur were set threegradients. Explore the influences on the growth and quality of tobacco under the interaction ofwater and Sulfur. Studied the effects of water and sulfur interaction on morphology,photosynthesis of tobacco. And also studied physical property, chemical composition, and sensoryquality of tobacco leaves. The main research findings were listed as follows:1. Analysis the distribution of soil available sulfur content and the variability characteristicsusing descriptive statistics and cluster analysis. The results shows: the average of soil availablesulfur content of Luohe is46.56mg/kg. Available soil sulfur content is adequate throughout theregion. The sulfide contents of irrigation water are at a low level.2. Analysis the relationship between soil sulfur content and the quality of tobacco in Luohe.the results shows: identity, oil, chroma, carbohydrate, chlorine, single leaf weight, leaf length, leafwidth, equilibrium moisture were decreasing with the increase of sulfur content in the soil; but thenitrogen, potassium, aroma quality, aroma quantity, aftertaste, concentration, strength and into agroup of were increasing with the increase of sulfur content in the soil. There have differentrelevance between the sulfur content and the quality indicators.3. Studied the effects of water and sulfur interaction on morphology and photosynthesis oftobacco. The result shows that, the agronomic traits have a decreasing trend after a first increaseswith the increase of sulfur using. The height and stem girth of T5higher than the other treatmentssignificantly. The leaf length of T1and the leaf width of T3were higher than the other treatmentssignificantly. After transplanting45days, the T3and T6have a better growing,28.8-43.2kg/hm2sulfur quantity. The largest leaf area, stem girth, height, the number of avalabile leaves were has a increasing trend with the amount of irrigation increased.The treatments of0times irrigation coordinate57.6kg/hm2sulfur quantity and5times irrigationcoordinate28.8kg/hm2sulfur quantity have a lower net photosynthetic rate, stomatal conductanceand transpiration rate than the contrast. A temperate irrigation coordinate suitable sulfur quantitycan promote tobacco photosynthesis conspicuous. In addition, the content of chlorophyll also havesignificant differences among all the treatments. The content of chlorophyll of T3higher than theother treatments significantly.4. The enzyme activity of tobacco samples was determined. The results shows that: aftertransplanting30days, the nitrate reductase activity and MDA content were at a lower level, thenitrate reductase activity of T3and T4were higher than the other treatment, the MDA content ofT1and T2were higher than the other treatment. There exhibit a significant difference among them.After transplanting45days, appeared a surprised increasing of the nitrate reductase activity andMDA content. The nitrate reductase activity reached maximum after transplanting60days. Andthen have a decrease after that. During this period, the nitrate reductase activity of T4and T6werehigher than the other, there are significant differences between them and the other treatments.MDA content was gradually increased in the growth period, the MDA content of T2at a high levelall the time.5. Analyzed the diversification of physical properties among different treatments. The resultsshows that, increase the sulfur and irrigation at a suitable quantity is good for leaf length, leafwidth, leaf thickness, stem content, padding and tensile strength. T5performed better than theother treatments. The industrial availability of flue-cured tobacco was promoted under thetreatment of3times irrigation coordinate43.2kg/hm2sulfur quantity.6. The chemical composition of tobacco samples was determined. The results shows that, thetotal sugar and total nitrogen have a significantly promotion under the43.2kg/hm2sulfur amount.The sugar content has a decreasing trend along of the amount of sulfur increased. The nicotinecontent has a decreasing trend after a first increase with the increase of sulfur using except the0time irrigation. Under a certain times of irrigation, the content of potassium and chloride have aincreasing trend along of the amount of sulfur increased. Under a certain mount of sulfur, thecontent of potassium have no obvious rules while the content of chloride shows a decreasing trendalong of the times of irrigation increased. Under a certain times of irrigation, the ratio of potassium to chlorine and the ratio of sugar to nicotine of tobacco leaves were decrease with theamount of sulfur quantity increased. The ratios of nitrogen to nicotine have no significantdifference. Too much or too little water influences the coordination between the chemicalcompositions of tobacco leaf. Under a certain mount of sulfur, the ratio of potassium to chlorineincreased with the times of irrigation increased. But the ratio of sugar to nicotine decreased withthe times of irrigation increased. The treatments of0times irrigation coordinate57.6kg/hm2sulfurquantity and5times irrigation coordinate28.8kg/hm2sulfur quantity have no benefit for thecoordination between the chemical compositions of tobacco leaf.7. Evaluated the sensory quality of tobacco leaves, the results indicated that, the sensoryquality features score, the style characteristic score and the smoke characteristic score of threetimes irrigation coordinate43.2kg/hm2sulfur quantity treatments were higher than the contrast.Excessive irrigation weakening the sensory quality of tobacco leaves to some extent. The amountof sulfur was57.6kg/hm2and28.8kg/hm2have a bad sensory quality which was withoutirrigation.