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From 2004 to 2005 , Henan Agricultural University Laboratory and the Science and Technology Park, the experimental field of annual the Campanulaceae growth and topping , dressing dynamically accumulated impact of yield and total saponin content , the results show that : ( 1) 40 to 50 ℃ warm water soaking the 24h and silk liquid culture combination of seeds germinate best results . ( 2 ) Campanulaceae ontogenetic period for seed germination (seed germination period , seed Lu Bai period , the seedling cotyledon stage , leaf period ), the seedling stage , jointing stage pumping stem , bud period , the flowering period , the seat can be divided into fruit stage , ripening , withering ; ( 3 ) year - on - year growth period is 180 to 200d ; ( 4 ) leaves the functional period of 25 ~ 63d, the blades life of 35 d to 70 d ; ( 5 ) root growth showed preliminary (nutrition growing season in early April to mid - July ) slow late ( reproductive stage in mid - July to late October ) fast characteristics , root length , root straight stems stabilized in early October , the root weight in late October is not increasing again. (6) topping applying potassium fertilizer , spraying nutrient solution had a significant effect on yield increases topping in the budding stage and Dressing Potassium Fertilizer effect . ( 7 ) root saponins content is relatively low in the early August high, September to October , a slight increase in late October ( the plant wilted period ) . (8) topping applying potassium fertilizer , spraying nutrient solution increased root saponins content have a certain effect , the Campanulaceae ground part of the total saponin content changes in trends and root is basically the same . (9 ) The the Campanulaceae excavation time should yield and quality of the situation into account, the only topping or dressing in late October , the excavation is more appropriate, both topping and dressing more appropriate excavation in late November . ( 10 ) Annual Platycodon root saponins content is relatively low , the majority can not achieve the minimum standards of the Pharmacopoeia , should not be used as medicine .
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