Effect Of Fertilization On Soil Biochemical Activity And Quality Of Tobacco

Tobacco as a cash crop, the quality is a very important factor.But there is a big gap between our tobacco leaf and foreign tobacco, mainly for the high nicotine content, low potassium, and taste poor,plus crop rotation is a very serious obstacle to the tobacco.Therefore, improve soil fertility and quality of the tobacco field become the main way that solve such problems. By field experiments, we assayed soil properties, tobacco character and quality affected by different fertilizer treatments in Luonan County, Shaanxi Province.To provide the basis for tobacco industry sustainable development in Shaanxi Province.The results showed as following:1. The effect of fertilizing steps on agronomical characters of flue-cured tobaccoFertilization are improved agronomical traits, organic fertilizer + chemical fertilizer treatment increased fairly good, and all parameters were appropriate.By correlation analysis, there relationship reached the significant and remarkably signiifcant positive correlation among tobacco yield and single leaf weight, effective leaf number, maximum leaf width, stem girth .2. The effect of fertilizing steps on the quality of tobaccoFertilization increased the tobacco chemical index, especially in the treatment of organic manure +chemical fertilizer increased the most obvious.Flue-cured tobacco in this region compared to appropriate total nitrogen / nicotine, upper leaves of total sugar/nicotine is relatively small, while the middle leaves of total sugar/nicotine in a reasonable range, potassium/chloride is greater than 4. The results show that tobacco chemical qualities were improved after fertilization3.The effect of fertilizing steps on soil nutrient contentFertilization improve the soil nutrient content,by applying organic manure + chemical fertilizer, soil organic matter, alkaline nitrogen, available phosphorus, available potassium contents were improved, and the difference reached the significantly levels than chemical fertilizer or organic manures.By correlation analysis, there is relationship reached the significant and remarkably signifcant positive correlation among most of soil properties, tobacco agronomical characteristics and chemical qualities, indicated soil and tobacco growing were the synchronized and consist change after applied fertilizers.4. The Effect of fertilizing steps on soil enzyme activitiesFertilization improve the soil enzyme activity, especially organic manure + chemical fertilizer treatment effection increased more significantly. On soil enzyme activity correlation analysis showed that soil enzyme activities were positive correlation, and soil enzyme activities and soil chemical properties for a positive correlation. The flue-cured tobacco yield and phosphatase (0.928*), invertase (0.921*), dehydrogenase (0.880*), catalase (0.896*) were significantly positive correlation, indicating that flue-cured tobacco yield and soil enzyme activities closely related.5. The effect of fertilizing steps on soil enzyme kinetic parametersAfter fertilization, the Vmax, Vmax / Km, k values of soil enzyme are higher than the comparison,especially organic fertilizer + chemical fertilizer is the most pronounced.changes in Km values of the soil vary due to differences in fertilization, but, in general, Km basically in the same order of magnitude.6. The effect of fertilizing steps on soil microbe quantityThe manure + chemical fertilizer was obvious improvement microbe quantity,it enhanced bacteria, fungi, actinomycetes number. Soil microorganism and soil nutrients, soil enzyme activity reached the level of significant correlation. Therefore their had closely related.In summary, from the agronomic traits of tobacco, tobacco quality, soil nutrients, soil enzyme activities and other terms, organic manure + chemical fertilizer is a good fertility patterns.