Nutrient and pH stability in liquid manure production and usage for pond fertilization
2012
Ebonwu, B.I.
Nutrient content of organic manure vary according to the composition which determines the fertility and efficiency. The effectiveness of liquid manure depends on the N.P.K value of the manure source. One kilogram of each manure source was weighed and loaded into a polyethylene bag for ten (10) days anaerobic fermentation. pH was monitored for five consecutive days after the second day using Digital pH meter (Model PHeP NOVO Illkirch Cedex France) with values ranging between 5.6-6.3 and 5.7-6.9 for both liquid manures slurry. The liquid manure was produced from Pig and Poultry manure slurry with N.P.K values range between 4.80-5.96, 4.10-4.66,0.47-0.80 and 7.50-8.80, 3.25-5.60, 0.79-0.85 for Pig and poultry manures respectively. Organic manure loose nitrogen when exposed to extreme temperature due to volatilization of NH3. Therefore, in liquid manure production, anaerobic fermentation enhances nutrient stability through immobilization of ammonia-nitrogen compounds. The interaction of N.P.K and pH shows the availability, stability and quality of nutrient in the liquid manure produced. Anaerobic fermentation produces better quality liquid manure than the manure due to immobilization of ammonia nitrogen. Both liquid manure had positive correlation (R2) of 0.6977 and (R2) of 0.2370 for Poultry and Pig liquid manure. Liquid manure application in ponds can reduce cost of pond fertilization especially in the integrated fish farming system than the use of organic manure directly serving as a better means of pond fertilization and pollution control in the farm environment under a stressed economy.
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