Effects Of Different Delayed-Application Fertilizers On The Quality Of Flue-Cured Tobacco

To study the rule of different delayed-application fertilizers nutrition releasing and theireffects on tobacco plant growth, quality and aroma components of flue-cured tobacco, wechoose sesame cake and NC89 as experiment materials. The rule of sesame cake nutritionreleasing was studied by pipe experiment. Three kinds fertilizers were chemical fertilizer,fully-fermented and unfully-fermented sesame cake fertilizer. Four additional manuringstages were basal dressing for all,20 days,40 days,60 days additional manuring. Their effectson plant growth and quality of flue-cured tobacco were studied in field and pot experimentwith randomized blocks design. The results as below: The organic carbon and nitrogen of the cake fertilizer were decomposed easily. Organiccarbon and nitrogen were decomposed most in 20 days and 35 days respectively. Theirreleasing meets the need for tobacco growth with the sufficient nitrogen. There are manyorganic substances in sesame cake, such as higher fatty acids, organic acids, amino acids etc.Their contents changed with fermented times and 30 days is the better time. Applying sesame cake, the vigor of plant is smaller than that of chemical fertilizer in former stage. But in last, it leads to stalk circumference increasing, the internode length decreasing. The maximum leaf area has little difference except treatment T12 and T8. It shows that additional manuring properly has no bad effects on the growth of tobacco plant. Applying sesame cake lead to a sound plant type. Different fertilizers and additional manuring stage affect tobacco physiologycharacteristics differently. Appling fully-fermented sesame cake affect the vigor of root tosome tune and it is small higher than chemical fertilizer at last. Appling unfully-fermentedsesame cake,the vigor was low in former and high at last. At last stage of plant growth, basaldressing for all, 20 days, 40 days additional manuring has same effect on the vigor of root. Applying cake fertilizer treat and additional manuring on late stages treats all canincrease the pigment substances applicantion in leaves. NRase activities of all treats is lowerfollowing tobacco's growing up. In late growing stage, all treats'difference of INV activitiesis unsignificant. The different kinds fertilizer treats is significant different. In thesetreats,fully-formented cake fertilizer treat is highest, unfully-formented cake fertilizer treat islowest, and chemical fertilizer treat is the middle one. They indicated that applied fully- 62formented cake fertilizer, carbon of leaf's fixation and transition is avtivity. Possibly it isadvantaged to form carbonous compound, increasing flue-cured leaf quality.MDA content in different fertilizer treat is not significant different. It indicated manuring inlate stage increases mature resistance of leaf. Fertilizer variations and additional manuring stages significantly affect flue-curedtobacco's customary qualities. Content of un-volatile organic acid and aromacomponents .applicated cake-fertilizer, flue-cured tobacco's quality is well-balanced.Organic acid content increased, and accelerated combined quality advance. In earlystage,applicating chemical fertilizer and unfully-formented cake fertilizer's effect is good,on 20 days, 40 days, 60 days additional manure fully-fermented cake fertilizer,their effect isbetter than basal dressing for all.