Effects Of Outer Hormone On The Growth,Development And Quality Formation Of Fluecured Tobacco

The effects of Different Outer Hormone Dose on Growth development and Quality formation of Flue-cured Tobacco were experimented in Pot and on fields in USTC during 2002-2003. The results as follows:1. Tl T3 can refrain growth of upside so as to speed growth of seedling; T2 T4 have bigger activity of roots in root extension period and in round roof period so they contribute to fast growth of seedling to prepare for fast growth of plant and provide nutrition for leaves and undertake its maturity in time.2. 30d ago after transplantation content of chlorophyll: T3>T1>T5>T4>T2, during the period of 30-60d content of chlorophyll show T2>T4>T5>T1>T3, they reach the highest point in the 60d.They descend rapidly after 60d.3. During the period of 30-60d activity of NR: T2>T4>T5>T1>T3 so as to maturity of tobacco leaf and absorb nutrition.T2,T4 maintain higher activity of Inv in the longer period, illustrate GA3 of higher level and ABA of lower level can promote amplify of carbon metabolism and fulfill thrive growth of plant.4. Results of agricultural features as follow: plant of T2 behave the best, the second is T4.generalization assay show that ensemble showing of T2 is the most prominent.5. Results of dry matter accumulation and root/corona and economical feature show that T2 can gain more justified plant and biology output and economical benefit.6. Hormone level of flue-cured tobacco leaf show: IAA>ABA>GA3, IAA, GA3 are both firstly upswing and then descending, ABA is always upswing. Their changes are more poignant after topping and accord with maturity and yellowing, synthetic assay shows ensemble behaves are the most outstanding.7. From changes of omni-nitrogen,nicoiine,protein starch and smelted omni sugar different treatments in the different period, we know that as GA3 upswing and ABA descending, contents of omni-nitrogen, protein and starch are first upswing and then descending, but nicotine is always raising and smelted omni sugar is first descending and then upswing. By analysis of chemical ingredient we know that chemical ingredient of T2, T4 is more suitable and their proportions are harmonious.8. Output, proportion of higher grade tobacco leaf and average price of different treatments are outstanding different. Output of T2, T4 are 21.21% and 16.85% higher than that of T5. higher grade leaf proportion(91.84%) is prominent bigger than that of T4(86.58%). Average prices of T2, T4 are notably higher than that of T5.In a word , T2> T4 are better and T2 is the best. They show economical index of flue-cured tobacco is rising as GA3 upswing and ABA descending.