Stabilization of Chemical and Biochemical Characteristics of Grass Straw and Leaf Mix during In-Vessel Composting with and without Seeding Material

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Grass straw and leaf mix (GL) were cornposted in-vessel with and without seeding material. Changes in pH, CO2-evolution rate (CER), and the microbial biomass in terms of total extractable lipill phosphate (TELP) contents were monitored until 150 d. The microbial biomass contents were nearly stabilized at about 0.11 mmol TELP kg^<-1> DM from the 60th day onward. The CER decreased gradually with the progression of cornposting and became stable also from the 60th day onward at around 1 g CO_2-C kg^<-1> DM d^<-1> On the contrary, the pH increased gradually until the 40th day and then became stabilized at about 8.8 during the remaining period of composting. The characteristics of the GL composts (150 d) were compared with those from other ready-composts. The germination indices (GI) of Dia sorghum seeds showed that all the composts were biologically mature. Although the pH varied from compost to compost, microbial biomass of GL and incubated ready-composts was about 0.1 mmol TELP kg^<-1> DM. Similarly, CER did not exceed a maximum value of 1.2 g CO_2-C kg^<-1> DM d^<-1>. Significant positive effects of seeding material addition were detected in total organic carbon and organic matter contents of GL composts. However, the effect of the addition of a seeding material was not obvious in the case of the microbial biomass and CER measurements. The results show that the germination index and CER together can give sufficiently reliable information about the maturity of GL composts, although the validity of our results for large-scale open field cornposting needs to be examined further.
社団法人日本土壌肥料学会の論文

Stabilization of Chemical and Biochemical Characteristics of Grass Straw and Leaf Mix during In-Vessel Composting with and without Seeding Material

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