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1、 烤烟论文：微生物有机肥对陇东烤烟品质的影响及机理研究【中文摘要】针对陇东烤烟生产中存在的因长期连作和有机肥施用不合理引起的烟叶化学和香味品质品质下降,尤其是中性致香物质含量较低、香气不足和商品特性下降等问题,本研究于2009年在甘肃省正宁县进行大田试验,研究施用微生物有机肥对烤烟化学品质和香味品质的影响,并对其影响机理进行初步探讨,旨在为当地烤烟的合理施肥提供依据。主要试验结果如下:1微生物有机肥对陇东烟叶化学品质的影响研究1.1微生物有机肥对烟叶化学品质的影响微生物有机肥(BIO)的施用显著提升了烟叶的化学品质,使烟叶主要化学成分(钾、烟碱、总糖和【英文摘要】Low content of
2、the main chemical components(MCC) and neutral aroma components (NAC),lack of aroma and flavor,and the decline in commodity characteristics caused by long-time continuous cropping and irrational fertilization have been the serious problems in flue-cured tobacco production in east of Gansu Province. A
3、 field experiment was carried out in Zhengning County in Gansu Province in 2009 in order to study the effects of bio-organic fertilizer (BIO) application on chemical and aromatic qualities of Flue-cured Tobacco in East of Gansu Province and its preliminary echanisms. The results shown that:Chemical
4、quality of flue-cured tobacco was proved with applying bio-organic fertilizer,the contents of potassium and nicotine and total soluble saccharides and reducing sugar within tobacco leaves were increased significantly,the ratio between total soluble saccharides and protein trended more to normal and
5、measured up to the standard of high quality tobacco leaves. the content of potassium in upper leaves,middle leaves and bottom leaves were increased by 30.20%,26.30% and 50.50% respectively compared with CK and nicotine by 42.67%,28.50%,99.11% and 20.38% respectively. Application of BIO reduced the d
6、ifference value between total soluble saccharides and reducing sugar and the ratio between total soluble saccharides and protein at different positions of tobacco leaves trended to the suitable range at the same time.BIO reduced pH value of tobacco-planting soil by 0.06 unit compared with CK and enh
7、anced soil fertility Simultaneously. the content of organic matter and available nitrogen and available phosphrous and available potassium in soil were significantly increased by 30.25%、28.50%、104.57% and 7.80% respectively.?Meanwhile,application of BIO significantly affectd the microbial diversity
8、in soil planted flue-cured tobacco and reduced the ratio between fungi and bacteria,those could bring about soil being in the state of more health. Namely,enhancement of soil fertility and biological features was the foundation that BIO could prove chemical qualitiy of Flue-cured Tobacco. Applicatio
9、n of bio-organic fertilizer obviously promoted the growth and development of flue-cured tobacco and increased the content of chlorophyll in tobacco leaves during the whole growth period,In addition,the number and biomass and area of tobacco leaves in later developmental stage were increased by diffe
10、rent extent,which could improve the canopied photosynthetic characteristics and photosynthetic productivity and were good for dry-matter production and sugar accumulation.Compared with CK,the nitrogen and potassium accumulation amounts of BIO treatment were obviously higher than CK in later developm
11、ental stage,at the same time,BIO affected nitrogen and potassium distribution in different organs and more nutrients flowed to tobacco leaves,which were the?major cause why the contents of nitrogen and nicotine and potassium within tobacco leaves under BIO treatment were obviously higher than those
12、of CK.BIO significantly proved physiological activity of tobacco roots and increased ability of absorbing mineral nutrients in root. Compared with CK,oxidizing ability of root and activity of root system under BIO treatment were increased by 22.27% and 9.76% respectively.BIO significantly increased
13、the total content of NAC in tobacco leaves by 26.79% -134.33% compared with CK. The total content of NAC at different position of tobacco leaves had dramatically different reaction to BIO,namely,the biggest increase was observed in the upper leaves,and the total content of NAC in upper leaves,middle
14、 leaves and bottom leaves were increased by 134.33%,81.03% and 26.79% respectively compared with CK. BIO application also changed the orders of the total content of NAC in tobacco leaves at different positions,the order of upper leavesbottom leavesmiddle leaves in CK treatment were turned into upper
15、 leavesmiddle leavesbottom leaves in BIO treatment, which is favorable to the output value of tobacco production. The main NAC in tobacco leaves in Zhengning is neophytadiene , accounting for 79.67%-89.43% of the total amount. The neophytadiene content in upper,middle and bottom leaves of BIO treatm
16、ent were increased significantly by 157.33%,88.15% and 31.17% respectively compared with CK. BIO improved the nitrogen absorption by tobacco,which not only increased the chlorophyll content in tobacco leaves,the precursor of neophytadiene,but postponed the summit of chlorophyll content by about 15 days as well which could extend the mature period. Activities of invertase and nitrate reductase at round top stage in BIO treat
