Study and Validation of Recommendation Fertilization Model of Flue-cured Tobacco

In order to realize the precision fertilization of tobacco fields,the study was conducted during 2007—2010 in Pingdingshan of Henan province,and the randomized block design including experiment schemes was put into practice in 10 dispersed spots each year.The models for nitrogen,phosphorus and potassium fertilizer recommendation were established based on four-year field experiments.The rational fertilization models were built with Truog-Stanford equation.The result showed that the best relationship between soil nutrients and correction factors were power function.When the content of soil nutrients increased,their correction factor decreased.The fertilization models for N,P,K fertilizer,respectively,followed as:N=0.068×Y-2.033×S0.328N,P2O5=0.079×Y-2.932×S0.334P,K2O=0.194×Y-2.923×S0.416K.The results indicated that the quality of tobacco in fertilization recommendation zone was better than the conventional fertilization with higher content of aroma constituent in flue-cured tobacco leaves.Recommended fertilizer reduced the amount of fertilizer application and the cost of agriculture.Based on the study,tobacco-planting field can be managed in a site-specific manner by these methods,in order to improve the tobacco quality and promote the sustainable development of tobacco.