Affect of Different Methods of Reducing Fertilizer Nitrogen on N Absorption and Utilization of Flue-cured Tobacco

To study on the different methods of reducing fertilizer nitrogen for N absorption and utilization of flue-cured tobacco in a field experiment was in 2009.The result showed that:(1) Compared with custom of farmers used N-fertilization(T1,N=108kg/hm2),the soil's supplying nitrogen capacity at late growth period of tobacco was promoted evidently with the N-fertilization reduced 55%(T4,N=48 kg/hm2) under 70% of fertilizer applied as top dressing;(2) Under all(T2) or 70% of artificial nitrogen(T3) applied as basal,nitrogen uptake by tobacco was not restrained significantly from reducing fertilizer(N=48kg/hm2) compared with T1(N=108kg/hm2) treat;on the condition with 70% of artificial nitrogen applied as top dressing,N absorption of tobacco can be inhibited from reducing fertilizer significantly under the same amount of N application;(3) Tobacco nitrogen use efficiency and nitrogen agronomic efficiency can be enhanced drastically from reducing fertilizer in treat of T2 and T3,respectively,and there was also no decreased of yield and output value of tobacco.While 70% of fertilizer applied as top dressing in treatment of T4,it can be seen that tobacco yield and output value declined evidently from reducing fertilizer,because of the decreasing of nitrogen uptake by tobacco;(4) Followed with the increased of total nicotine of tobacco,tobacco total sugar and reducing sugar were decreased evidently with the increment of top dressing proportion.However,the sensory quality of flue-cured tobacco was not affected significantly.It was suggested that the needs of tobacco nitrogen nutrition can be provided effectively from reducing fertilizer under all or 70% of artificial nitrogen applied as basal.