Effects Of Different Plastic Film Types Covering On Soil Temperature,Moisture And The Yield And Quality Of The Flue-cured Tobacco

To explore the effects of different types of mulching on the growth and development of the flue-cured tobacco,yield and quality of tobacco leaves,and soil water retention in the soil layer of tobacco-planting soil,the common agricultural film commonly used in the production and the field mulch used to control weeds in fields For comparison,the application of degradative films with different degradation times was studied.Research indicates:1.The effects of different treatments on the temperature and humidity of the cultivation layer of tobacco-planting soil: The temperature and humidity of the soil in each layer of treated soil in the early growth period were significantly changed,and the biodegradable film was the most stable,and the effect was better than that of the field mulch film and common agricultural film.After the tobacco leaves enter the mature stage,the difference between ordinary plastic film treatment and other temperatures is very small,within 1.5°C.2.The effects of different treatments on the growth and development of flue-cured tobacco plants: The biodegradation film had better effects on the agronomic traits of flue-cured tobacco,and it was more obvious in the early growth period.At the late growth stage,there was no significant difference among the treatments.The Pliofilm that began to degrade on the 90 th and 60 th days performed better.The SPAD value of the largest leaf leaf was significantly higher than that of the common agricultural film.The root activity of the flue-cured tobacco was the highest on the field film.3.Effects of different treatments on important physiological and biochemical characteristics of flue-cured tobacco leaves: The degradation film of 90 days is more conducive to the improvement of nitrate reductase activity and peroxidase activity,especially under unfavorable conditions;the net photosynthetic efficiency of tobacco leaves at various stages of degradable film treatment is high For the rest of the treatments,the chemical composition of tobacco leaves was basically in the suitable range,and the optimal degradation film was 90 days,which effectively promoted the improvement of the chemical composition of flue-cured tobacco.4.The effect of different treatments on the yield and quality of flue-cured tobacco: The total score of sensory quality evaluation of tobacco leaves treated with degradative film was higher than that of ordinary plastic film and field mulch film;the ratio of top-quality tobacco leaves with 90 days of degradable film treatment accounted for 52.3%,the yield per unit was 1940.25 kg/hm2,and the output value reached 48,619.5 yuan./hm2;The effect of reducing the incidence of field plants in the natural state was better,in which the incidence rate of disease-causing strains(36.7%)was significantly lower than that of the field mulch(55.8%)and common agricultural film(51.3%).In summary,the use of degradable membranes to cover the effect of soil water retention and heat preservation,tobacco growth and development,production and quality,etc.than the common agricultural film and field film.In the treatment of degradable membranes,the effect of 90 d degradation membrane was better,especially in favor of the increase in the yield of flue-cured tobacco and the increase in the total output value of tobacco leaves.At the same time,Pliofilms save labor costs for uncovering membranes,and ensure the economic benefits of crop cultivation while protecting the environment,which has a good prospect of popularization and application.