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| Comparative analysis on the production of shixing tobacco leaf by different nitrogen forms |
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| DOI：10.16768/j.issn.1004-874X.2018.02.012 |
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| Abstract: |
| Shixing is an important producing area of Guangdong Luzhou-flavor tobacco. Under different
ecological conditions，the effects of different nitrogen forms proportioning on the production of flue-cured tobacco
are different. It is particularly important to determine the nitrogenous form proportioning fertilization method in line
with the local ecological conditions according to local conditions. In this study，field experiments were conducted to
investigate the effects of different N sources on the nitrogen fertilization rate. The nitrogen application rate was 165
kg/hm2 and the treatments were N1（ 100% nitrate nitrogen），N2（ 30% ammonia nitrogen + 70% nitrate nitrogen）， N3（ 50% ammonia nitrogen + 50% nitrate nitrogen），N4（ 70% ammonia nitrogen + 30% nitrate nitrogen） and N5
（100% ammonia nitrogen） The effects of flue-cured tobacco on the fertility process，agronomic and economic
characters and chemical composition of flue-cured tobacco were analyzed. The results showed that：（1） Nitrate
promoted tobacco plants grow quicker，the growth process accelerated，mainly in the shortened rooting stage. With
the increase of the proportion of nitrate nitrogen，the field growth period of flue-cured tobacco tended to shorten.
（2） When the proportion of ammonium nitrogen increased，the main agronomic characters of tobacco plant was
significantly different in the resetting stage，whereas the major agronomic traits and differences budding stage and
dome stage of tobacco was not obvious. （ 3） The optimal performance of the economic characters of flue-cured
tobacco leaves under the condition of 50% nitrate nitrogen and 50% ammonium nitrogen ratio.（4） The ratio of 30%
nitrate nitrogen and 70% ammonium nitrogen，50% nitrate nitrogen and 50% ammonium nitrogen was beneficial to
the accumulation of petroleum ether extract. The results showed that nitrate nitrogen promoted the rapid emergence
and rapid growth of tobacco plants in early growth，and the appropriate ratio was conducive to the performance of
economic traits and the coordination of chemical components. |
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