Effects Of High Amount Of Liquid Pig Manure Fertilizer On Nutrient Content Of Black Soil And Aeolian Sand Soil

With the new layout of "raising pigs from the south to the north",the number of pigs raised in northeast China increased rapidly,resulting in a large amount of liquid manure pollution.The treatment direction of pig liquid manure is changed from "treatment" to "utilization".In order to explore the effect of liquid manure from pig manure water on soil fertility after returning to field,an experiment was carried out in Kangping County,Liaoning Province.Taking regular tillage fertilization as control(BCK in black soil area and SCK in sandy soil area),liquid fertilizer generated by anaerobic fermentation of pig manure water was returned to field at a high rate of 20 cubic meters per mu.The effects of liquid manure application(BMS in black soil area and SMS in sandy soil area)on soil nutrient content were studied.The results show that: In the black soil area,the contents of organic carbon,total carbon,nitrate nitrogen,available nitrogen,total nitrogen,available phosphorus and total phosphorus were significantly higher than those of conventional fertilizer treatment after two application of liquid fertilizer in pig manure water,which increased by 60.89%,83.24%,755.53%,358.17%,58.83%,56.27%,95.82%,respectively.The carbon pool management index increased significantly by 93.83%.But soil available potassium content decreased significantly by 49.34%.The content of nitrate nitrogen and available phosphorus in wind-blown sandy soil increased by247.37% and 105.34% after the application of pig manure liquid fertilizer.The C:P and N:P of black soil were 22.66% and 24.24% higher than that of conventional fertilization,respectively,and there was no significant change in C:N,indicating that phosphorus was not the limiting element in this area.In summary,the ratios of C:N,C:P and N:P of soil in the experimental site were all low,and soil carbon and nitrogen were the limiting elements of soil nutrients in this area.After the application of pig manure liquid fertilizer,the content of most nutrients in the black soil increased greatly,and the fertilizer effect was good.There was little difference in soil fertility between the wind-sand soil and the conventional fertilization treatment.In conclusion,the application of pig manure water in the black soil area of Liaohe River Basin can significantly improve soil fertility,so as to scientifically and rationally consume pig manure water,promote soil moisture conservation and fertilizer cultivation in northeast China,and reduce agricultural non-point source pollution,which is conducive to promoting the pattern of planting and breeding combined with recycling in Northeast China.