The Assessment Of Soil Fertility And Study On Balanced Fertilization Technology In Tobacco Area Oh RiZhao

The nutrient of soil reflects the ability of soil provide and harmonize the nutrition condition and the ambient condition for plant growth,which is the basis of land productivity.Soil condition is the dominant factor to decide tobacco leaf quality,the proper soil nutrient is an important basis to produce high quality and output tobaceo,so,soil nutrient situation is the basis of tobacco fertilizing and nutrition regulating.Balanced fertilization is a fertilization method which depends on trophic situation of soil,the absorption of various nutrients in different crops to supply the necessary nutrients,propose scientific formula ,so as to obtain the most highest yield and the best ecnomic efficiency.According to the problem that the tobacco soil nutrient status is unclear in RiZhao, the fertilizer formula is unreasonable,the fertilizer utilization rate is not high,we do some analysis and research on plentiful or short situation of the soil nutrient factors and the influence of the balanced fertilization ,main results are as follows:1. An investigate was done on the focus tobacco-growing areas of soil nutrient factors in Rizhaofrom 2006 to 2007,Analysis and research the tobacco soil nutrient factors and the correspondingin nutrients tobacco situation of lack or abundance the effect of balanced fertilization to tobacco production and quality.The main results are following:We collected and analysed the tobacco soil samples from Rizhao city.The results showed that orgnaie matter was less , most are lack:Rapidly available nitrogen and phosphorus are abandant;Exehnagebale magnesium was rieh;In microelements,the contents of chiorine and iron were deficient,manganese and copper were abundant;The pH was reasonable,individual districts were higher.Some advices were given:(l)Some of the lack organic matter should be added;(2)The microelement should be added, such as zinc and iron;(3) Add gypsum into individual alkaline soil to make it suitable.2.To determine the corresponding leaves' nutrient,the results showed that:The total nitrogen in the lives was moderate;The phosphorous in some areas was higher,it should be pay attention to;The potassium in the soil was abundant,but because of the effect of fertilization technique and irrigation Conditions,the potassium in the leaves was lower in some areas,in early periods you should control the fertilization by control the amount of water;Manganese copper, calcium and magnesium in the microelement were abundent;Zinc iron and boron should be added appropriate in Donggang and Lanshan.3.The research to different nitrogen form showed that the characters, level of production,output value, coordination of chemical composition,quality of ueing NO3- and NH4+ simultaneously were better than using the NO3- or NH4+ purely.Useing both NO3+ and NH4+ 50 percent was the best.Useing the NO3- 25 percent and NH4+ 75 percent was the second.4. We carried out the regional test which treat the impact of the different nitrogen's levels on the yeild and the quality of tobacco. the results showed that: With the level of nitrogen gradual increasing from the 4～7kg/667m2,the nicotine content, the nitrogen content,its output,its output of values increased significantly . When the amount of nitrogen fertilizer in more than 6kg/667m2, the aroma quality,the amount of aroma of tobacco leaves and the high class leaf rate have a downward trend instead, and the cost-effectiveness reduce. Through the overrall balance,the result is best when the amount of nitrogen(pure N) is 5～6kg/667m2 for the flue-cured tobacco in Rizhao.With the increased proportion of nitrogen and phosphorus,the yield and the quality of flue-cured tobacco all have an increased trend.5. We have test the different fertilizer formulas which impact on the production and the quality of the field,the results showed that: with the increase in the proportion of the inorganic fertilizer,tobacco production and the output gradully increase, nicotine, total nitrogen and potassium content have a rise, and the aroma quality ,the aroma amount was on slightly lower volume trends. After a comprehensive evaluation, the output, the value of output,the quality of smoking have better performance in the ecological conditions of rizhao when organic and inorganic fertilizer are each in 50%. Simple application of organic or inorganic fertilizer, tobacco production quality are worse.