Nahar et al. (2006) found a strong negative relationship between non-plant parasitic and plant parasitic nematodes after composted cattle manure application, supporting “the utility of the ratio between non-plant parasitic and plant parasitic nematodes as a useful soil quality indicator”.
However, Neher (2010) (Ecology of Plant and Free-Living Nematodes in Natural
and Agricultural Soil) does not recommend the use of the above ratio but prefers the use of maturity indexes.
As we have found good inverse correlations between non-plant parasitic and plant parasitic nematodes after organic soil amendment - I would like to include this ratio in our paper - what are your thoughts on this?
PPI/MMI ratio perhaps help you to solve the problem. You should see the paper 'Bongers T, Van der Meulen H and Korthals G 1997 Inverse rela-tionship between the nematode maturity index and plant parasite index under enriched nutrient conditions. Appl. Soil Ecol. 6,195–199.' I hope it will help you.
i recommended the maturity index which is better than the ratio between Non-plant parasitic and plant parasitic nematodes as Xiaoke Zhang say.
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