Comparison of accuracy between root length measurement method and germination index method for determination of compost maturity
2007
Ikeda, K.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Koyama, F.
The accuracy of germination index method which evaluate maturity of compost made from livestock feces was compared with that of root length measurement method. The germination index was significantly correlated (P0.01) with oxygen consumption, ammonium nitrogen content, pH, EC which are considered to affect compost maturity. On the other hand, the index of root length showed a significant correlation only with EC (P0.01). 80% of compost determined matured as per oxygen consumption or ammonium nitrogen content was determined matured by means of root length measurement method and germination index method. 40% of compost determined immature from oxygen consumption was determined immature through root length measurement, and about 90% was determined immature through germination index method. 40% of compost determined immature from ammonium nitrogen content was determined immature using root length measurement method; as to 60%, immature using germination index method. Thus, germination index method has a significant correlation with biological/chemical method as regards compost maturity, and has higher accuracy than root length measurement method when oxygen consumption and ammonium nitrogen content are used as indicators. It is excellent in terms of evaluating the level of immature compost in particular.
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