Study On Treatment Of Earthworm To Different Combinations Of Livestock Manure And Stalk

To use earthworm to treat waste, compared with the traditional method, has many advantages such as high efficiency, good economic benefits, clean, and so on. This paper aims to study the ability of earthworm to deal with Changchun agricultural waste (corn stalks, rice straw, horse manure, duck manure), to explore the factors that impact the efficiency of treatment, to take the analysis of the nutrient content in the end products, and to seek the most efficient combined form of treating livestock manure and straw.In this paper, we focus on taking the analysis of the growth and breeding status of earthworm living in combinations of different types or proportion of manure and straw; taking the comparison of the physical and chemical properties and the nutrient content of the combinations with or without earthworm treatment; and taking the analysis of the unique characteristics of the combinations with different efficiency.The results showed that all the combinations were suitable for earthworm to grow and breed. And there is a significant negative correlation between the growth and breeding. Earthworm weight were significantly increased at the end of the experiment, and the peak weight was found on the 20th d. Earthworm weight living in duck manure combinations has larger fluctuation than those in the horse manure combinations, and was also significantly higher at the peak weight. The rice straw combinations are more suitable than corn stalk. The manure type and the straw type are two main factors that affect growth of earthworm, while the mixture ratio is the non-major factor. Every combination has the increasing trend of cocoon amount over time, however, the earthworms in the duck manure mixture made more cocoons than those in the horse manure mixture.The total nitrogen, total phosphorus, available nitrogen and phosphorus content of the combinations were significantly improved when earthworm was treated. According to the level and rate of increase, the combinations of the 3/1 ratio is higher than the 1/1 ratio, and the combinations of duck manure is higher than the horse manure. Potassium content does not significantly improve in the combinations of horse manure, while significantly increase in the duck manure, however, the increase rate is small, while still a few combinations of potassium content of decline in the total potassium. The available potassium content of all the combinations was significantly improved. According to the increase of total potassium and available potassium, the 3/1 ratio of the mixture is greater than 1/1 ratio, while the combinations of corn stalks are greater than the rice straw.The organic carbon content and C/N of all the combinations were significantly decreased, while there's no significant difference among the combinations in the decline rate. The combinations of duck manure have the lower C/N and the higher rate of C/N decline. The pH in all the combinations were significantly lower, but still partial alkaline. The pH differences between each combination became larger by the treatment of earthworm; the combinations of the duck manure have the significantly lower pH than the horse manure.The physical and chemical properties of the combinations after treated have the significant Correlation with the earthworm growth and breeding conditions. To a certain extent, the combinations with higher nitrogen, higher total phosphorus content, and lower C/N are more conducive to the growth of earthworms, while the better growth and activity of earthworms also causes stronger impaction to the nitrogen, total phosphorus, organic carbon content and C/N in combinations. The strong alkaline environment is not conducive to breed earthworm.