Effects of Different Proportions of Cow Manure and Grass Cuttings on the Growth,Reproduction and Fecundity of Earthworm
In order to reduce the environmental pollution caused by livestock manure and grass clip-pings,and promote the recycling of resources and the development of green agriculture,the experi-ment explored the effects of different proportions of cow dung and grass clippings on earthworm growth,reproduction and the vermicompost fertility.With cow dung as the base material,0(T1 group),25%(T2 group),50%(T3 group)and 75%(T4 group)of grass clippings were added respectively for 60 days of the cultivation of earthworms.The results showed that the average body weight of earthworms in each group experienced a pattern of initial increase followed by a decrease.The average body length of earthworms in T1,T2 and T3 groups increased gradually in the first 15 days,and then tended to be stable.The cocoon production of earthworms in all groups showed a trend of first increasing and then decreasing,among which the T2 group was the highest.pH of all groups tended to be neutral,electrical conductivity(EC)value increased,organic matter content decreased,while total nitrogen,total phosphorus and total potassium contents increased.The num-ber of bacteria,fungi and actinomycetes in the vermicast was significantly increased in all groups,with the highest in group T2.In terms of heavy metal content,the heavy metal content of each group showed a decreasing trend,with the largest reduction in the T2 group.To sum up,it is an effective waste disposal method to breed earthworms in cow manure by adding grass clippings.When the a-mount of grass clippings was 25%,it was more conducive to the growth and reproduction of earth-worms,the promotion of the degradation of organic matter,the increase of the number of microor-ganisms and the improvement of fertility.At the same time,it also effectively reduced the content of heavy metals in earthworms.
grass clippingscow manuregrowth and reproductionpower of worm manure
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