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Effect of Different Sowing Methods on Standing Seedling Rate and Quality of Cotton Seedling in Floating System

ZHOU Hong-mei,CHEN Jin-xiang (College of Agronomy,Hunan Agricultural University,Changsha,Hunan,410128,China)  
In order to simplify the techniques in floating nursing system,F1of Nongza 66 was used as material to conducted experiments on different laying manners,cover thickness and sowing depth in Hunan Agricultural University in 2006~2007.Experiment on seed laying manner showed that horizontal laying was the best for heightening seedling rate and standing seedling rate and reducing the ratio of seedling with seed coat.At the same time,the stem radical,primary root length,the number of lateral roots,fresh stem weight and fresh root weight in horizontal laying treatment were higher than those in control and others treatments.Experiment on cover thickness showed that seedling rate was above 90.0% and ratio of seedling with seed coat was lower than 5% in 1~1.5 cm treatments.When seed cover thickness was 1.5 cm,both seedling rate and standing seedling rate were above 90.0% and the ratio of seedling with seed coat was 1.0% in sowing depth 1.5~2.0 cm treatments.
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