Studies On The Effects Of The Growth And Quality Of Paeonia Lactiflora Under Different Trace Elements

In roder to provide theoretical guidance for the application of B, Zn and Cu fertilizer of Paeonia lactiflora cultivation, the effects of B, Zn and Cu on the growth, photosynthesis, yield and quality of the view point of plant nutrition and plant physiology were studied. The results were as follows.1. The height, stem diameters and leafe areas of Paeonia lactiflora were effected by spraying different concentrations of B, Zn and Cu fertilizer on the leaves. Low concentration of fertilizer can promote the growth of P. lactiflora.2. With the growth of stem and leaf, there was the maximum absorption of B in35to42days after spraying. The accumulations of Zn of stem and leaf were different with different treatments. There was little change of the absorption of Cu in different periods. The absorption of Cu reached the peak about7to14days after spraying.3. The concentration of soluble sugar and soluble protein of P. lactiflora were increased by certain concentration of B fertilizer. And within a certain range, the content of soluble protein increased with the increase of concentration of B. The soluble sugar reached peak6.39%when the concerntration of Zn was600mg-L"1, and soluble protein reached peak0.0045mg·g-1when the concentration of Zn was400mg-L"1, the content of soluble sugar and soluble protein of P. lactiflora content was higher when Cu concentration was low, and it will inhibit the soluble sugar and soluble protein in the formation and accumulation when Cu concentration was too high.4. The differences of photosynthetic characteristics and pigment contents of P. lactiflora with green and red leaves were distinct. Pigment content of P. lactiflora with green leaves was as twice as the red one, and the content of soluble sugar was higher, too. The photosynthetic rate of P. lactiflora with green leaves was much higher than the red one under the same PAR and CO2concentration. The green one has larger light saturation point (LSP)570μmol·m-2·s-1and CO2saturation point (CSP)1136.0μmol-mol-1. The AQY and CE of P. lactiflora with green leaves were significantly higher than the red one. Diurnal variation of photosynthesis of P. lactiflora with green and red leaves was "double peak" curve. There is no obvious difference of Chlorophyll fluorescence parameters between P. lactiflora with green and red leaves.5. Photosynthetic characteristics of different treatments are diffenence. When the concentration of B was100mg·L-1, the treatment has higher Pn and AQY. The trentments with Zn fertilizer have higher Pn and AQY when its concentration was100mg·L-1or200mg·L-1. And the treatment with400mg·L-1Cu fertilizer has higher Pn and AQY. Overall, low concentration of B, Zn and Cu fertilizer can promote the photosynthesis of P. lactiflora.6. The concentration of soluble sugar and paeoniflorin of the root of P. lactiflora was increased by different B fertilizer. The concent of soluble sugar, the weight of root and drying rate were highest when the concentration of B was400mg·L-1.The weight, drying rate and diameter of the root of P. lactiflora was increased by different Zn fertilizer. The treat of100,200and400mg·L-1improved the yield significantly. The content of paeoniflorin increased with the increase of the Zn concentration, and the paeoniflorin content of the800mg·L-1treat was as twice as of the contrast.The length and diameter of root Low was improved by concentration of Cu. All treats promot the content of soluble sugar, paeoniflorin and paeoniflorin, as well as its drying rate. The paeoniflorin content of the200mg·L-1treat was as twice as it of contrast.B, Zn and Cu accumulated mainly in the cortex, very little remained in the medicine material after frying and it can be used safely.