Effects of NPK Proportional Fertilization on Physiological Characteristics of Saraca dives Seedlings
[Objective]The effects of different fertilization ratios of NPK on the physiological characteristics of one-year-old Saraca divesseedlings were studied,which provided theoretical basis for cultivating S.divesseedlings.[Method]Taking S.dives seedlings as experimental material,the L9(34)orthogonal experiment was conducted through setting different ratios of N,P2O5 and KCl as taking non-fertilization treatment as CK,and then the influence of different fertilization ratios on the physiological characteristics of S.dives seedlings were analyzed.[Result]There were significant differences in POD and SOD enzyme activities of leaves from S.dives seedlings under different N,P and K treatments(P<0.05),with 563.33-823.67 U/[g(FW)·h]of POD enzyme activity and 854.41-974.71 U/[g(FW)·h]of POD enzyme activity.Compared with CK,the POD and SOD enzyme activities under different treatments all decreased.The soluble protein and soluble sugar under different treatments were all higher than CK,and the content of soluble protein and soluble sugar treated with N2P2K3 were the highest with 3.72%and 3.84%,respectively.The free proline and MDA content were both significantly lower than CK,while the free proline of N3P2K1 treatment was the highest(423.31 mg/g)and N2P2K3 was the lowest(125.11 mg/g).The MDA content of N3P1K3 was the highest(13.66 μmol/g)as that of N2P1K2 was the lowest(10.33 μmol/g).The photosynthetic pigments under different treatments were all higher than CK,and chlorophyll a,chlorophyll b and total chlorophyll were significantly different from those of CK.The chlorophyll a and total chlorophyll content under N3P1K3 were both the highest,with 2.14 mg/g and 3.07 mg/g,respectively.The chlorophyll b and carotenoids under N3P2K1 were the highest,with 0.94 mg/g and 0.46 mg/g,respectively.POD and SOD enzyme activities showed extremely significant correlations with photosynthetic pigments.[Conclusion]Under different N,P and K fertilization treatments,the physiological characteristics indexes of S.dives seedlings were all betters than CK,among which the soluble protein and soluble sugar in leaves both were significantly higher than CK.As N increased,chlorophyll and carotenoids content were both higher than CK significantly.K fertilizer combining with appropriate N and P fertilizer could more effectively promote the production and enrichment of soluble protein and soluble sugar in S.dives seedlings.N played a leading role in photosynthetic pigments of S.dives seedlings.The physiological status of S.dives seedlings was the best as treated with 2 g/plant urea,1.6 g/plant P2O5 and 3 g/plant KCl(N2P2K3).
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