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• W2377603272 abstract "The effects of nitrogen (N) and phosphorus (P) on seedling growth,chlorophyll,Chl concentration,total alkaloids concentration and total alkaloids yield of Sophora flavescens was studied.Four levels of N were applied at the rates of 0 (Control),38,75,and 150 kg/hm2 using urea (N 46%) fertilizer,and three levels of P at 0 (Control),23,and 45 kg/hm2 using single superphosphate (P2O5 12%) in a virgin land test.Seedling stem height,bud numbers,plant fresh weight,root fresh weight,and root dry weight of S.flavescens increased significantly when N and P were applied.The interaction of nitrogen and phosphorus was significant.The treatment of 150 kg/hm2 N and 23 kg/hm2 P led to significantly (P≤0.05) greater stem height,bud numbers,plant fresh weight,root fresh weight and root dry weight than the control (increases of 27.1%,31.7%,123.2%,104.8%,and 120.0% respectively).The results for the treatment of 75 kg/hm2 N and 23 kg/hm2 P were close to these.Root dry weight/root fresh weight and root dry weight/total plant dry weight increased with P applied.The root diameter and the xylem diameter were greatest with 150 kg/hm2 N and 23 kg/hm2 P applied,increasing by 26.4% and 39.8% respectively compared with the control (P≤0.05).There was a significant positive effect of nitrogen and phosphorus on root bark thickness which increased with N and P applied to a maximum at 45 kg/hm2 P applied.The treatment of 150 kg/hm2 N and 23 kg/hm2 P led to significantly (P≤0.05) greater leaflet numbers per plant,leaflet area,plant area,leaflet fresh weight,leaflet dry weight than the control (50.9%,79.8%,168.0%,58.5%,and 87.1% respectively).There were positive effects of nitrogen and phosphorus on seedling Chl concentration,total alkaloids concentration and total alkaloids yield of S.flavescens.Chl concentration and total alkaloids concentration were greatest with 75 kg/hm2 N and 45 kg/hm2 P applied,increasing by 80.3% and 71.0% respectively compared with the control (P≤0.05).It is proposed that the positive effect of nitrogen and phosphorus on root dry weight is due to the positive effect on main root dry weight,and that the root diameter increased with N and P applied due to the increase in xylem diameter and root bark depth,and that total alkaloids concentration increased with N and P applied due to the increase in Chl concentration." @default.
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• W2377603272 date "2010-01-01" @default.
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• W2377603272 title "Effects of nitrogen and phosphorus on seedling growth and total alkaloids of Sophora flavescens." @default.
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