Application of corn straw compost compound substrate for vegetable seedling in cold region
In order to explore the feasibility of replacing traditional peat soil matrix with corn straw compost in cold region,the traditional matrix composed of peat soil,vermiculite and perlite was used as a control,and two kinds of compound substrates,A(Vcompost∶Vvermiculite∶Vperlite=2∶1∶1)and B(Vcompost∶Vvermiculite∶Vperlite=1∶1∶1),were used to deter-mine the effect of the compound substrate on the growth of cucumber and pepper seedlings,as well as the nutrients and related enzyme activity before and after seedling raising.The results showed that the bulk density,water air ratio and conductivity of the two composite substrates were significantly different from those of the traditional substrates.In terms of the effect on seedling growth,at 28 days of seedling planting,the plant height of cucumber seedlings on A and B substrates were significantly increased by 67.25％and 44.95％,the stem diameter was significantly increased by 29.30％and 17.83％,and the chlorophyll content was significantly increased by 7.42％and 3.13％,respectively,compared with the control.The plant height,stem diameter and chlorophyll content of pepper seedlings on A and B substrates were signif-icantly increased by 8.55％and 15.36％,2.38％and 6.21％,4.74％and 12.44％,respectively,compared with the control.After seedling raising,the content of ammonium nitrogen and available potassium in the substrate decreased,while the content of available phosphorus increased.The content of available phosphorus in A and B substrates increased by 71.27％and 76.36％,respectively,after cucumber seedling cultivation;the content of available phosphorus in A and B sub-strates increased by 249.22％and 115.81％after pepper seedling,respectively.The activity of urease and acid phosphatase in A and B substrates increased and sucrase activity decreased at the end of seedling raising.In conclusion,substrate A is more suitable for the growth of cucumber seedlings and substrate B is more suitable for the growth of pepper seedlings,which can replace the traditional peat soil substrate for cucumber and pepper seedlings,respectively.
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