The field experiment were carried out to study the effect of different straw mulching rates(3000kg/ha,6000kg/ha and 9000kg/ha)on soil physical,chemical and biological properties of tobacco field and quality of tobacco leaves after film uncovering.The results indicated that the application of straw mulching after film uncovering decreased soil bulk density and soil pH,adjusted soil temperature,increased organic matter,water and microbial biomass in soil and content of potassium in tobacco leaves.Compared to ...