Study On Screening Of Padding In Pig-on-litter System

At present, the resource of animal dung and corn straw, corn cob and otheragricultural resources are extremely rich in our country, but these resources cannotbe completely applied in production practice. Therefore, to carry out thepig-on-litter system can have a positive meaning for agriculture circular economyand sustainable development. Traditional padding in pig-on-litter system is givenpriority to with sawdust and rice husk, but rice husk and sawdust resources in thenorthwest region are less and higher price, so this experiment chooses corn strawand corn cob which are cheap and rich in the northwestern region in naturalresources as partly replace the raw material, so as to screen out the optimal paddingwith the low costs, favorable result of fermentation and high economic value. Onthe basis of the total weight of the same principle, the test designed8groups, group1(control group):100%(sawdust+rice husk)(sawdust: rice husk=1:1), group2:30%corn straw+70%control group, group3:50%corn straw+50%control group,group4:70%corn straw+30%control group, group5:30%corn cob+70%controlgroup, group6:50%corn cob+50%control group, group7:70%corn cob+30%control group, group8:30%corn straw+30%corn cob+40%control group. Thetesting time was60days. Since before the test, added pig dung every10days at18:00, adding the same amount of culture and nutrient solution to each group beforethe test, the20th day, the40th day at19:00. We could get the following results bymeasuring the temperature, moisture content, total nitrogen, organic matter, GI andcost analysis:1. The temperature measurement results showed that the temperatures of all thegroups at the10th day were the highest during the testing time. The highesttemperature of group8was52.83℃at the10th day of fermentation and hadincreased35.57%compared with the group1.2. The moisture content determination showed that moisture of all the groupshad maintained between40%and55%, on the whole was falling.3. The organic matter determination results showed that the organic matter content was declining with the extension of fermentation time, all the eight groupshad no significant difference with themselves (p>0.05), the organic matter of group8had fell the most, fell by23.14%compared with before the test. Total nitrogencontent determination result showed that the difference between all the eight groupswas not significant (p>0.05). The total nitrogen content increased after initiallyadding pig dung, with the decomposition of function culture, the volatilization ofammonia, total nitrogen content was declined.4. The seed germination index (GI) determination showed that the GI of all thegroups was0before adding pig dung. After adding pig dung30days, the GI ofgroup8was greater than50%. After adding pig dung60days, the GI of group8,3,6were greater than80%, the rest groups were more than70%, all the groupsshowed that padding could return to the field and had no biological toxicity.5. By calculating the cost, the results showed that the group1had the highestcosts.The group4and group7had the lowest costs, the group8was close to thecost of group4and group7.On the basis of the above-mentioned results, we concluded that effect of group8which adding30%corn straw+30%corn cob+20%sawdust+20%rice husk wasgood, it had the high economic benefit and could be used in pig-on-litter system inthe northwest region.