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[Objective]To study the changes of nitrogen(N),phosphorus(P)and potassium(K)contents in five-year-old Schisandra chinensis (Turcz.)Baill.leaves at different growth stages.[Method]Potassium bichromate titrimetric method-outside heating method was used to determine the soil organic matter.Alkaline hydrolyzation diffusion method was used to detect the available N.0.5 mol/L NaHCO3 extraction-Mo-Sb colorimetric method was used to detect rapidly available P;NH 4 OAC extraction-flame photometry was used to detect rapidly available K;H 2 SO4-H2 O2 method was used to digest the plant sample.Total N was detected by distillation titration method;total P was detected by vanadium-molybdenum-yellow colorimetry;total K was detected by flare photometer.Changes of N,P and K contents in five-year-old S.chinensis leaves at different growth stages were detected.[Result]S.chinensis leaves had the strongest absorption capacity to N in all growth period,followed with K.And P had the smallest absorption.N and K contents in S.chinensis leaves were relatively high in leaf-expansion stage;N and K contents fell smoothly from flowering stage to wilting stage.P content was relatively high in leaf-expansion stage and from late berry growth stage to early fruiting stage, and decreased greatly in late fruiting stage.[Conclusion]Artificial cultivation of S.chinensis needed enough base fertilizer and top-dressing of P was also needed at berry growth stage.
[Objective] To study the changes of nitrogen (N), phosphorus (P) and potassium (K) contents in five-year-old Schisandra chinensis (Turcz.) Baill.leaves at different growth stages. [Method] Potassium bichromate titrimetric method -outside heating method was used to determine the soil organic matter. Alkaline hydrolyzation diffusion method was used to detect the available N.0.5 mol / L NaHCO3 extraction-Mo-Sb colorimetric method was used to detect immediately available P; NH 4 OAC extraction- total photographic was used to detect rapidly available K; H2SO4-H2O2 method was used to digest the plant sample. Total N was detected by distillation titration method; total P was detected by vanadium-molybdenum-yellow colorimetry; total K was detected by flare photometer. Changes in N, P and K contents in five-year-old S. chinensis leaves at different growth stages were detected. [Result] S. chinensis leaves had the strongest absorption capacity to N in all growth period, followed with K. And P had the smallest absorption. N and K contents in S. chinensis leaves were relatively high in leaf-expansion stage; N and K contents fell smoothly from flowering stage to wilting stage. P content was relatively high in leaf-expansion stage and from late berry growth stage to early fruiting stage, and decreased greatly in late fruiting stage. [Conclusion] Artificial cultivation of S. chinensis needed enough base fertilizer and top-dressing of P was also needed at berry growth stage.