Effects Of Various Nitrogen Fertilizer Treatments On The Growth, Development And Quality Of Flue-cured Tobacco

The experiment which carried in the field and used zhongyan100as the material,mainly studied the effects of five different nitrogen levels, as well as the combining of organicand inorganic fertilizer on growth, development and quality of flue-cured tobacco byanalyzing the dynamic changing characters of multinomial indexes and combining the finalquality indexes, we drawed the following concluions:1. Effects of various nitrogen fertilizer treatments on botanical characters of tobacco plantNitrogen application significantly increased tobacco plant height, stem girth and leaf area.Within a certain range, raising the level of nitrogen on plant height, stem girth, leaf area wasbeneficial, but not the higher nitrogen level as possible, the height, stem girth and leaf area ofT3was not the best one. The combining of organic and inorganic fertilizer can make the plantheight, stem girth increase, significantly increase leaf length and increase leaf area.2. Effects of various nitrogen fertilizer treatments on dry matter and nitrogen accumulationand distributionThe results showed that accumulation of dry matter of flue-cured tobacco was mainlycompleted in vigorous growth stage. Compared with the treatment without nitrogen, thetreatment with nitrogen can accumulate more dry matter. Raising the level of nitrogen canincrease the dry matter accumulation of the whole plant and plant organs, the mostaccumulationg of dry matter is T3or T2. The result also showed that inceasing the nitrogenlevels can increase the proportion of distribution of dry matter in root and stem, and reducethe proportion of leaf.The dry matter accumulation of the whole plant and plant organs of T1is more than CK2.The proportion of distribution of dry matter in root and stem is higher than CK2during thelatter growth of tobacco, and finally the higher one is T1.3. Effects of various nitrogen fertilizer treatments on some physiological indices of flue-curedtobaccoThe results showed that as nitrogen level increased the plastid pigment of and three kindsof the activeness of key enzymes enhanced. Among them, the nitrogen level of CK1and T0nitratase activity declined ahead of time, the conversion of nitrogen metabolism to carbon metabolism forward, the nitrogen metabolism weaker than carbon metabolism. However inthe nitrogen level of T2and T3, it was opposite; T1was inductive to carbon and nitrogenmetabolism. The combining of organic and inorganic fertilizer on the content of chlorophylland the invertase activity had no regularity effects.4. Effects of various nitrogen fertilizer treatments on the content of plastid pigment andpetroleum ether of flue-cured tobaccoCompared with the treatment without nitrogen, the treatment with nitrogen significantlyincreased the content of chlorophyll and carotenoid (addition to chlorophyll of T0). Within acertain range, increasing nitrogen levels can increase the content of plastid pigment, but notthe higher nitrogen level as possible. T1had the highest content of chlorophyll, and T2hadthe highest content of carotenoid. The regulation of petroleum ether content with the rising ofnitrogen level was the same as the plastid pigment, but there was no significantly diferencebetween T1, T2and T3. In content of petroleum ether, T3was the highest one which wasslightly higher than T1. Compared to the CK2, T1significantly improved the content ofchlorophyll and petroleum ether, and slightly improved the content of carotenoid.5. Effects of various nitrogen fertilizer treatments on chemical components of flue-cured tobaccoleavesCompared with the treatment without nitrogen, the treatment with nitrogen significantlyincreased the content of nicotine and total nitrogen. With the nitrogen level rising these twosubstances content was rising, but the content of total sugar, reducing sugar, and starch wasreducing. From the degree of coordination of the chemical composition ratio, T1had morecoordinated TN/Nic and TS/Nic. Compared with CK2, T1can improved the rest of thechemical composition in addition to the total nitrogen, and had the better TN/Nic and TS/Nic.In conclusion, T1was the best one which is conducive to the production of high qualitytobacco.6. Effects of various nitrogen fertilizer treatments on neutral aroma of flue-cured tobacco leavesAll of the28kinds of neutral aroma substances, the content of19kinds of neutral aromasubstances of treatments with nitrogen were higher than the one without nitrogen. From the totalneutral aroma and the five major categories aroma, T1was higher than the others in the content ofthe total neutral aroma, the productions of carotene-degrading, the aminophenol, neophytadieneand the production of browning reaction. Compared with CK1, the percentage of increasing thecontent of the total neutral aroma and the five major categories aroma, T1was significantlyhigher than CK2.