Contents of Nutrient Components and Heavy Metal Elements in Litters of Pig-on-litter Farming System
Contents of organic matter (OM),total nitrogen (TN),total phosphorus (TP),total potassium (TK),and copper (Cu),zinc (Zn),chromium (Cr) of the litters from different depth and service period (vary from 1 months to 26 months) in pig-on-litter farming system at Nanning were investigated and analyzed to explore the environmental safety of returning litters to field.The results showed that there were no significant differences of the same nutrient component and heavy metal element among litters of different depth.Compared with 1 month litters,the 26 months pig litters were rich in nutrient components.The content of TN,TP and TK was 1.75％,2.47％and 1.35％,increased about 0.44,1.09 and 0.62 percent with significant difference(P＜0.01),respectively.The content of OM increased from 37.55％ (1 month litters) to 40.05％ (26 months litters),increased about 2.5 percent with significant difference(P＜0.05).And the contents met the National Standard of Organic Fertilizer of China.The dynamics of Cu and Zn contents was similar to the nutrient components,contents of the 26 months litters increased 116 ％ and 110 ％ with significant difference(P＜0.01),respectively,while there was no diffidence of Cr content (P＞0.05).And the contents of Cu,Zn and Cr in the litters were at a very low level,and less than the allowances of relevant National Standards.The waste litter could be used as organic manure directly.
pig cultivationmicrobial fermentation bedorganic matternutrient componentheavy metal
NETL
NSTL
万方数据
维普
