Research On The Reasonable Application Of N Fertilizer Flue-cured Tobacco In Wenshan

Tobacco is one of the most important economic crops in Wenshan area, Created a large number of tax for the national and local fiscal every year, Study how to improve the yield and quality of wenshan tobacco is a reasonably distributed event. The fertilizer is very sensitive and tobacco, In Various kinds of fertilizer, Nitrogen had the greatest influence on yield and quality of tobacco, Is the formation of the main factors of tobacco plant, Therefore study how the n fertilizer is very important to improve the quality of tobacco leaf production.Wenshan is located in the southeast yunnan, In the complex terrain, There is a special soil climate than the rest of the country, In recent years, according to the empirical mode to fertilization had appeared smoke inclusions, baking smoke after chemical composition is not harmonious, It is difficult to meet the requirements of the tobacco industry company. Therefore, studying how to scientific and reasonable fertilization is primary task to improve the quality of Wenshan tobacco production.(1) Ammonium nitrate ratio of 5:5,6.5:3.5 the processing of chlorophyll a, always the highest in the nitrate reductase activity;Ammonium nitrate ratio was 6.5:3.5 processing root activity and chlorophyll b content, The highest stage, the chlorine content is always the lowest;Only in potassium ammonium nitrate ratio of 2:8 the processing of the content is the lowest.Research suggests that ammonium nitrate ratio 6.5:3.5 processing is the most suitable proportion of flue-cured tobacco growth ammonium nitrate.(2) Didn’t add the N fertilizer processing stages of 4 to 6 days in advance,30% basal and 70% basal has no effect on tobacco growth period;(3) The effect of nitrogen on the growth of tobacco plant, particularly evident not CK of nitrogen in the plant height, leaf number, leaf length, leaf width is dealing with the lowest, the same n application rate and base than different T1, T2, no significant difference on the agronomic traits, while base than the same n application rate high T1, T2 and n application rates low T4, T5, there are significant differences in plant height, said benq after comparing agronomic traits, and amount of nitrogen fertilizer into the biggest impact on plant height.(4) Increasing nitrogen can significantly improve the application of red star disease incidence, And N application rate is less and the disease index is larger; N application more and less black stem increases,The incidence of 70% the same n application rate of fertilizer than 30% high rates of fertilizer of T1, T2, T3 (30% of the total nitrogen dosage of 112.5 kg/hm2, as basal,70% as fertilizer) the incidence of black shank of the lowest. And the common Mosaic with N application rate and nitrogen than doesn’t seem to matter.(5) The amount of nitrogen fertilizer in flue-cured tobacco production and a significant positive correlation, a large quantity of nitrogen fertilizer and fertilizer same T2 (70%) fertilizer on the yield, average price and the proportion of superior tobacco are slightly higher than that of T1 (fertilizer) 30%, moderate n application rate of T3 in moderate yield, average price and the proportion of superior tobacco are higher than other processing of fertilizing, reached the highest value of 3253.536 yuan/mu.(6) N application flue-cured tobacco are positively correlated physical indicators length, width, and the lower part of upper leaves, leaf stalk content into a significant negative correlation relationship.The conclusion of this experiment is:the ammonium nitrate nitrogen ratio 6.5,3.5, total nitrogen dosage of 112.5 kg/hm2,30% as basal,70% as fertilizer fertilization method can be used as wenshan nitrogen method of reference in the future.