烤烟砂培漂浮育苗的试验与应用

为了降低育苗成本,以砂作为基质研究了烤烟砂培漂浮育苗技术。结果表明:与现行漂浮育苗比较,出苗率高且出苗整齐,大约60 d可以成苗,成苗率和壮苗率较高;在出苗后至大十字期前,烟苗生长缓慢,生育期晚2~3 d;大十字期后,烟苗生长迅速,生育期与现行漂浮育苗一致;烟苗茎粗、茎高、最大叶面积、干物质积累量、总根数以及根系活力、硝酸还原酶活性、叶绿素含量的变化均表现出烟苗生长前期缓慢增长,后期急剧上升;至成苗后期,根系活力、硝酸还原酶活性、叶绿素含量又有所下降。砂培漂浮育苗的烟苗根系发达、生长健壮整体素质好,育苗成本较现行漂浮育苗降低56.58%。

Study on Flue-cured Tobacco Seedling Culture in Sand-cultured Floating System

For reducing seedling culture cost,tobacco sand-cultured floating system was studied,where sand was the only growing medium.The results showed that:comparing with existing floating system,the sand-cultured system featured higher germination percentage and more uniform seedling size,and the whole seedling stage took about 60 days.The seedlings grew slower until 4 true leaves stage,and it was 2-3 days slower than existing system;afterwards seedlings grew as fast as those growing in the existing system.The characteristics of the seedlings,including stem height and circumstance,area of biggest leaf,dry material accumulation,total root number and vitality of root systems,NR enzyme's activity and chlorophyll content,developed slowly in early growing stage and rapidly in late growing stage.However,the chlorophyll content,NR enzyme's activity and vitality of root systems decreased in late stage of seedling desired to plant.It was concluded that the seedlings cultured in sand-cultured floating system grew vigorously and had well developed root system,moreover,its cost of culture was reduced by 56.58% compared with existing floating system.