基质配比对烤烟烟苗素质的影响OA

To improve the base substrate formula for the seedbed and enhance the quality of tobacco seedlings,this experiment used vermiculite as the base substrate,combined with dry farmland soil and peat,and used 20 g of seedling fertilizer per pot as the control(treatment 5).4 treatments were set up:treatment 1(vermiculite∶organic fertilizer 3∶1,seedling fertilizer 10 g/pot),treatment 2(vermiculite∶organic fertilizer 4∶1,seedling fertilizer 15 g/pot),treatment 3(vermiculite∶organic fertilizer 2∶1,seedling fertilizer 10 g/pot),and treatment 4(vermiculite,seedling fertilizer 20 g/pot).The growth period,growth and development conditions,and agronomic traits of the tobacco plants under each treatment were measured.The results showed that the treatment group using the vermiculite substrate had earlier seedling emergence compared to treatment 5,and neither sudden stand collapse disease nor anthracnose occurred;treatments 2,3,and 4 had stronger growth vigor during the seedling stage,while treatment 5 had weaker growth and paler seedling color,with slightly poorer growth performance;the tobacco seedlings in treatment 3 were the tallest(4.20 cm),had the longest leaf length(3.10 cm),the widest leaf width(1.66 cm),and the longest root system(7.2 cm).The SPAD value of the tobacco leaves of treatment 2 was the highest(26.80).Overall,treatment 3(vermiculite∶organic fertilizer ratio of 2∶1,seedling promoter 10 g/pot)can shorten the seedling raising period,significantly improve the uniformity and stress resistance of the tobacco seedlings,and is characterized by well-developed root systems,large accumulation of dry matter,and large leaf area.