Study On Protective Cultivation Techniques Of Tobacco Fields

Combine with the climatic conditions of lushi tobacco area,we take related experimental study on large area spreading of ploughing green-manure and no-tillage with barley as green manure, the experiment set two farming systems which were sowing barley on deep tillaged flat land and deep tillaged ridged field,then taking this as prerequisite we got two treatments,results showed that: Effects of no-tillage and green manure1. Different period of barley seeding directly affected the number of biolygy in which taking ploughing green-manure.We can see that seeding in the last ten day of September is fitter than the October .It's not good for the growth of barley in the middle ten dany of October ,that's a little late and this will bring on the reduce of dry matter2. Changs of soil water content.The blank contronl group's soil water content was highest in the three treatments.,ploughing green-manure in March took second place,the April treatment was least,so it showed that the soil water content increased with the increase of soil depth,so we'd better plough green manure earlier.3. Soil temperature changes.For the green-manure test the ground tempereature between 5cm-20cm was consistent for the ploughing green-manure treatment and no-tillage, covering with plastic film is higher than no film.4. Disease situation in different treatment..Compare to the check tobacco fields,the chance for infected virus disease and brown spot was fewer, the treatment no-tillage with film is better than the check,but the situation in 2007 was serious,it showed that ploughing green-manure treatment may play a role in reducing disease.So we should pay attention to the virus diseases control when we treat with no-tillage and film5. Output of different treatment. The ploughing green-manure and no-tillage treatment's yield including output value per mu and fine tobacco ratio were better than the check.6. Ploughing green-manure can enhance the content of available nitrogen and available phosphorus including available potassium in seasonal soil. meanwhile,it can reduce PH value and increase organic matter of soil.Application effect of straw mulchingThere were no obvious differences in main growth period of tobacco between straw mulching and film mulching,but compared with the open cultivation, spherical plant stage ahead of 8 days or so, squaring period aheand of 4 danys, maturity in advance, growth period shortened; agronomic characters small difference, but compare with the open tobacco field, plant hight, stem thickness,leaf number,leaf length,leaf width were both increased;straw mulching can reduce diseases,inhance tobacco quality; straw mulching and film mulching were beneficial to raise the tobacco yield, output value per mu and fine tobacco ratio.