Effect of Bio-Organic-Inorganic Compound Fertilizer on Soil and Nitrogen Nutrition of Flue-cured Tobacco

To improve the quality of tobacco and the utilization ratio of fertilizer,an experiment was conducted to study the effects of bio-organic-inorganic compound fertilizer on soil and nitrogen content of flue-cured tobacco.The results indicated that after adding chicken manure and bio-organic-inorganic compound fertilizer made from oil cake into the soil,the content change trends of ammonium nitrogen and nitrate nitrogen in treated soil featured by first increasing and then decreasing.Compared with the control,the highest content of ammonium nitrogen and nitrate nitrogen in soil appeared 28 d later;The dry matter accumulation increased by 15.8~36.4 g and the nutrient utilization rates of N increased by 1.35%~4.5%;The allocation proportion of nitrogen in tobacco leaves increased by 0.71% ~4.78%(the allocation proportion of nitrogen in middle leaves increased by 13.06%~14.79%,which was the highest),The nitrogen allocation proportions in root and stem decreased by 0.39%~2.2%,0.31%~2.58% respectively.