烤烟移栽技术一直是全国各大烟区烟农和科研人员不断研究创新的领域，随着社会经济和烤烟生产的发展，许多烟区在生产中遇到了技术瓶颈，新型移栽技术的研发与推广日显必要。综述了烤烟移栽技术的发展与井窖式小苗移栽技术的优势，并对其研究方向进行了展望，以为该技术的完善及推广提供参考。

Aimed to the existing problem of lower usability of the upper leaves in China's tobacco production in the presence,the influencing factors for lower usability of upper leaves of flue-cured tobacco were analyzed,the ways and methods for improving the usability of upper leaves were summarized,and the research on improving the usability of upper leaves of flue-cured tobacco was prospected.

This paper reviews the effects of exogenous organic acids and tobacco organic acids on quality of tobacco leaves, and the distributional differences of tobacco organic acids in different types, different cultivars, different leaf positions, different regions,different grades, and puts forward the existing problems at present and the outlook for the future research direction.

This research mainly took the method of random area group experiment in Hefeng , Enshi, Hubei Province.It studied results that influenced by different amount of fertilizer application mixed with synergist to the tobaccoYunyan 87 physical and chemical properties and production.Analysis showed that fertilizer synergist mainly had an effect on accelera-ting growth rate of the Yunyan 87 from its initial stage to flourishing period.Changes of the chemical components of flu -cured tobacco include that fertilizer synergist increased a great amount of starch content and reducing sugar .In particular , decreasing 20%fertilization amount made the highest of them , What’s more,decreasing 20% of fertilization amount and 15%of fertilizer synergist , recommended by the locals , made a higher production and output value.Such method also made a better result in improving the rate of the superior tobacco and the secondary tobacco ,at the equal yield level ,the fertilization quantity can be saved about 10%.

Hybrid rice combination Longliangyou072 and hybrid rice Shenyou9576 were used to study the yield formation of ratoon crop and its relationship with the main crop.The result showed that among different nodes of Hybrid rice combination,the 2nd node from the top to the bottom showed the highest LAI and dry matter weight and the 4th node the lowest.There was significantly positive correlation between the yield of ratoon crop and the LAI of main crop in tillering stage,booting stage,full heading time and milk stage,the corresponding correlation coefficient were 0.864,0.896,0.935 and 0.941.The dry matter weight was the highest in milk stage,and the lowest in tillering stage for main crop and ratoon crop respectively.The dry matter weight of main crop in milk stage was significantly positively related with the yield of ratoon crop(r=0.451).Comparing to the main crop,root activity and photosynthesis rate were higher while chlorophyll content were lower in ratoon crop.Root activity of ratoon crop in booting stage and full heading time was very significantly positively related with the yield of ratoon crop,with correlation coefficient being 0.913 and 0.843 respectively.Chlorophyll content of ratoon crop in tillering stage,booting stage and milk stage was very significantly positively related with its yield,with correlation coefficient being 0.913,0.943 and 0.927 respectively.Photosynthesis rate of ratoon crop in tillering stage,full heading time and milk stage was significantly positively related with its yield,with correlation coefficient being 0.722,0.791 and 0.727 respectively.From full heading time to maturity,the ratooning bud generated from the 3rd node of main crop from different combination showed the largest mean length of bud.From twelve days after the full heading stage to maturity,viable bud rate was decreased along with the nodes from top to bottom.The percentage of 14C photosynthates distributed in panicle was the highest and the lowest in other leaves.The number of effective panicle and seed setting rate affected the yield of ratoon crop mostly,and the 2nd and 3rd nodes from the top to the bottom contributed 70% to the total yield.

The straw mulching after film uncovered technique is an improved tobacco cultivation mode based on the plastic firm mulching and straw mulching cover patterns. This paper reviews the cause and efficacy of dual-mode covering culti-vation mode with straw mulching after film cover pattern, and raised the prospect of research direction on double coverage model.