Selection Of Substrates Of Factory Seedling

The possibility of sawdust as the substitute for peat in pepper seedling and varieties of Physical and chemical character, lignocellulose and the ratio of C/N are studied. The results are summarized as follows: 1) After decomposition, the volume weight(BD)x container capacity (CC)ofsawdust increase,total porosity (TP), air-filled porosity (AFP) decrease; EC also decreases , pH lies in range of 5. 8 -6.2;nitrogen and crude protion of most treatments decrease; quick-acting P of treatments with chicken manute(CM) increases,but that decreases in treatments with urea except for M-6; exchangeable K of all treatments increases in the different degree; CEC> Ca, Mg increase too, which is larger in treatments with CM than treatments with urea in the same level. 2)Fresh sawdust has rich lignocellulose and high ratio of C/N , which can decrease after decomposition. Cellulose decomposes faster in first 25d in treatments with urea than in last 35d,but the result contrary in treatments with CM. Nitrogen contributes to sawdust decomposing, and with the content of nitrogen increasing , the ratio of C/N decreases faster. 3)When decompose, sawdust with Eymo-genic bacterium can get to high temperature faster than that with EM .After decomposition,EM improves sawdust 's moiture holding capacity, which is very obvious in treatments with CM. 4)In course of seedling growth,EM promotes seedling growth distinctly. During last stage of seedling , seedling on treatments with EM can remain superiority. 5)M-6 (urea 7kg. m-1, calcium superphosphate 6kg. m-3, potassium sulfate 4kg. m"3, EM 0.21) is the best in the treatments with urea;M-ll (CM60 kg. m-3, calcium superphosphate 6kg. m"3, potassium sulfate 4kg. m"3, EMO. 21) is the best in the treatments with CM, some characters even supper CK.M-11 is the best in all treatments and get to the level of CK,and can subsititute for peat.