| In order to promote the reasonable use of a large amount of eucalyptus residues,this article uses it as the main material,and adjusts the C/N value of the treatments by adding different nitrogen sources(ammonium sulfate,chicken manure,and urea)to 30:1,then carried out and without adding a nitrogen source as a control(CK)for comparison.Further,rotted eucalyptus residue was used as a raw material,and it was compounded with other commonly substrates.The seedling experiment of cucumber "Jinyou No.4" and the seedling experiment of green pakchoi "Improved Jinpin 28 Qinggengcai F1" were conducted.Through experimental determination and comparative analysis,provideing a reference for the industrial research and development of eucalyptus residue substrate.The main findings are as follows:1、Added different kinds of nitrogen sources to eucalyptus residue to adjust the carbon/nitrogen ratio of eucalyptus residue to 30?1 and then carried out.The results showed that the three treatments with added nitrogen source can complete the maturation until 64 d,while the control without added nitrogen source has incomplete maturation,showing that the C/N is still high,and the T value is> 0.6.The EC values are all too high in all treatments and cannot be used directly as seedling substrates.In particular,the EC value of the T1 was the highest,reaching 3.5 m S/cm;the p H of this treatment was only weakly acidic(6.52),and the rest of the treatments were slightly more alkaline.The germination test was further carried out and the results showed that the GI of the T2 and the CK was less than 80%,indicating that the two treatments still have phytotoxicity in the substrate after fermentation,which has an effect on the survival and growth of seedlings.It should not be used for seedling experiment.2.Maturity fermentation material with inorganic nitrogen source used as raw material,mixed with peat,perlite,vermiculite,and rotten Chinese medicine residue according to different volume ratios for cucumber?Jinyou No.4? seedlings.In the cucumber seedling experiment,T1(15%eucalyptus residue 1),T2(30% eucalyptus residue 1),T4(15%eucalyptus residue 2),T9(30% eucalyptus residue 1& 30%Chinese medicine residue)and T10(20% eucalyptus residue 2& 10%Chinese medicine residue)is better than CK and other treatments which can promote the growth of cucumber seedlings.The proportion of decayed eucalyptus residue can be used to replace more than 30% of the peat without adding Chinese medicine residue,but the replacement amount should not exceed 45%;while with the addition of Chinese medicine residue can replace 30% to 60% of the amount of peat,which can significantly promote the growth of cucumber seedlings.3.Using rotted eucalyptus residue added with ammonium sulfate as raw material,mixed with peat,perlite,vermiculite according to different volume ratios for seedling growth of green pakchoi,the results show that:T1(15% eucalyptus residue),T2(25% eucalyptus residue)has a significant promotion effect on the growth of green pakchoi.The rotted eucalyptus residue can replace 15～25% of the amount of peat,but as the proportion of rotted eucalyptus residue is further increased(>35%),the growth of the green pakchoi will be inhibited.In summary,different nitrogen sources have a greater impact on compost maturity,the eucalyptus residue added with chicken manure as nitrogen source still has phytotoxicity after fermentation and should not be used as a substrate for seedlings.However,the physicochemical properties of Eucalyptus fermented with these two nitrogen sources have their own advantages and disadvantages,which need to be further adjusted to meet the conditions of vegetable seedling.In cucumber seedling experiment,the addition of decomposed Eucalyptus residue can reach 30%,and should not exceed 45%;In the seedling raising experiment of green pakchoi,the addition amount of rotted eucalyptus residue using ammonium sulfate as the nitrogen source should not be greater than 35%,and the suitable range is 15%～25%. |
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