Effects Of Different Ratio Of Organic Fertilizers On Plant Growth And The Quality Of Flue-cured Tobacco

In this experiment,“Zhongyan100” as the study materials, through the fieldmethod, six treatments were setted to study the effect of the amount of organicfertilizer and organic fertilizer proportion with inorganic fertilizer on improvement ofsoil, tobacco growth and the quality of flue-cured tobacco. The purpose is to provide atheoretical basis for improving soil physical and chemical conditions through arational application of fertilizer, to provide technical support for the outstandingquality of High Flavored Style tobacco. The main results are as follows:1The effect of organic fertilizer on soil nutrient conditions at different growthstages of flue-cured tobacco.Fertilization played an important role on increasing the soil organic matter. Withthe increase amount of nitrogen fertilizer or the proportion of organic fertilizer, soilorganic matter and content of nitrogen can be enhaced. The treatment of100%highnitrogen organic fertilizer and of40%organic fertilizer+60%inorganic fertilizerwere the most obvious ones which can effectively improve soil organic matter contentand soil nitrogen content.2The effect of organic fertilizer on soil microorganisms at different growthstages of flue-cured tobacco.Fertilization can effectively increase the amount of soil bacteria andactinomycetes, but not increase the amount of fungi significantly. With the increase ofnitrogen fertilizer or the proportion of organic fertilizer, the amount of soilmicroorganisms can be effectively increased. The treatment of40%organic fertilizer+60%inorganic fertilizer was the most obvious one which can effectively enhace theamount of soil microorganisms.3The effect of organic fertilizer on aboveground growth at different growthstages of flue-cured tobacco.Compared with the control treatment without fertilization, fertilization caneffectively promote the growth of the aerial parts of tobacco plants. The treatment of100%inorganic fertilizer caused tobacco leaf leggy. The treatment of100%organic fertilizer was not conducive to the growth of tobacco leaf, which would reduce yields.But with the increasing amount of nitrogen organic fertilizer can effectively promoteaboveground parts’ growth. Organic and inorganic mixed fertilizers in the tobaccoplant growth trended to be reasonable. The treatment of40%organic fertilizer+60%inorganic fertilizer was the most obvious one which can effectively enhace the growthof aboveground parts of tobacco.4The effect of organic fertilizer on underground growth at different growthstages of flue-cured tobaccoCompared to the control treatment without fertilization, fertilization effectivelyenhance the vitality of tobacco root, root dry weight. The root activity increasedbefore a decrease with the increase of proportion of organic fertilizer, and root dryweight decreased. Increase the amount of nitrogen organic fertilizer can not increaseroot activity, but did increase root dry weight. In summary, The treatment of40%organic fertilizer+60%inorganic fertilizer was the most obvious and also the mostdurable one which can effectively enhanced tobacco roots activity.5The effect of organic fertilizer on some physiological indices of flue-curedtobacco at different growth stages.Chlorophyll content in the treatment of applied100%inorganic fertilizer washigh, which is not conducive to mature tobacco leaves yellowing. Organic andinorganic mixed fertilizers were beneficial to coordinate the tobacco leaf chlorophyllcontent. Increasing the amount of organic fertilizer was the other way to increasechlorophyll content. The carotene content kept reducing from30days aftertransplanting in the treatment of applied100%inorganic fertilizer, while the carotenecontent reached a maximum in the day which was45days after transplanting in thetreatment of40%organic fertilizer+60%inorganic fertilizer. The carotene contentreached a maximum in the day which was60days after transplanting in the treatmentof60%organic fertilizer+40%inorganic fertilizer and the treatment of100%organicfertilizer. Even if there was an increase on carotene content in aach treatment atdifferent stages, that was very gentle.6The effect of organic fertilizer on the chemical quality of the roasted tobaccoIn treatment of100%inorganic fertilizer, the total nitrogen content was too high,total sugar and reducing sugar content was low in upper leaf, and nicotine content washigh in middle leaves. In the treatment of organic fertilizer mixed inorganic fertilizer, total nitrogen content was reasonable, potassium content was increased significantly,total sugar and reducing sugar content was increased, the ratio of nicotine and sugarwas reasonable, the ratio of potassium and chloride was high, the ratio of nitrogenand nicotione was close to1.0. With increasing the amount of organic fertilizer,nicotine content, chloride and potassium content and total nitrogen content of upperleaves was increased. Overall, The treatment of40%organic fertilizer+60%inorganic fertilizer was the most obvious one to promote the chemical quality ofcoasted tobacco leaf.7The effect of organic fertilizer on the neutral aroma of roasted of tobaccoOrganic fertilizers helped to increase the contents of aroma in lower leaves, butthe content of aroma in upper leaves was low; while inorganic fertilizers helped toincrease the content of aroma in upper leaves, but it was in a low level in lowerleaves. Therefore organic and inorganic mixed fertilizer helped to coordinate the leafcontent of aroma in various parts of the tobacco, to soft the taste, to reduce irritation.With an increasing amount of organic fertilizer, aroma components significantlyincreased. Overall,100%organic high nitrogen fertilizer had a great effect onenhancing the content of aroma, but treatment of40%organic fertilizer+60%inorganic fertilizer had the most comprehensive and effective improvement on thecontent of aroma constituents in various parts of tobacco leaves.