Effects of light substrate ratio on the growth of container seedlings of Excentrodendron hsienmu
[Purpose]The seeding substrate formula suitable for the growth of Excentrodendron hsienmu seedlings was screened out to provide a basis for the cultivation of E.hsienmu container seedlings.[Method]Coconut husk,peat soil,perlite,and vermiculite were used as raw materials to prepare substrates(L1-L6)with volume ratios of 9 ∶ 1 ∶ 0 ∶ 0,8 ∶ 2 ∶ 0 ∶ 0,7 ∶ 3 ∶ 0 ∶ 0,8 ∶ 1 ∶0.5 ∶ 0.5,7 ∶ 1 ∶ 1 ∶ 1,and 6 ∶ 1 ∶ 1.5 ∶ 1.5.Coconut husk(CK1),yellow soil(CK2),and coconut husk+3.0 kg·m-3 slow-re-lease fertilizer(CK3)were used as controls.A single-factor randomized block design was used to carry out the container seedling test.The physical and chemical properties of the substrate and the growth index,leaf area,and chlorophyll content of the seedlings were measured.Correlation analysis and membership function value calculations were carried out.[Result](1)The dry bulk densi-ty of L1-L6 treatments was 0.128-0.192 g·cm-3,the total porosity was 81.207%-86.497%,the pH value was 6.530-6.995,and the contents of total nitrogen,total phosphorus and total potassium were 1.135-4.830,0.121-0.274,and 4.512-6.709 g·kg-1,respectively,which were suitable for the growth of E.hsienmu under different substrate treatments.(2)Under L1-L6 treatment,the average container seedling height of E.hsienmu seedlings was 28.58-32.29 cm,the average ground diameter was 5.02-5.32 mm in March 2021.The growth of container seedlings in each treatment was generally better than that of CK1 and CK2.(3)Correlation a-nalysis showed that fresh weight of the underground part,dry weight of the underground part,primary lateral root number of the seedlings highly significantly negatively correlated with dry bulk density,and wet bulk density of the substrate,and highly signifi-cantly or significantly positive correlated with total porosity,non-capillary porosity,and pH value.Primary lateral root number of the seedlings significantly positive correlated with total phosphorus content.(4)The comprehensive evaluation results of the membership function values showed that the order of seedling growth quality under different substrate treatments from high to low was L6>L2>CK3>L1>CK1>L3>L4>L5>CK2.[Conclusion]The membership function values were compared,and the physicochemical properties of different substrates and their effects on seedling growth were considered.Coconut husk:peat soil:perlite:vermiculite ratios of 6 ∶ 1 ∶ 1.5 ∶ 1.5 and 8 ∶ 2 ∶ 0 ∶ 0(L6 and L2 treatments)were selected as the optimal substrates for E.hsienmu container seedlings.
Excentrodendron hsienmucontainer seedlinglight substrategrowth index
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