Effects of Organic Manures in Changes of Some Soil Properties at Different Incubation Periods

Abstract

A laboratory incubation experiment of 60 days was\rcarried out to observe the changes of soil pH, electrical conductivity (EC),\rsoil organic carbon (SOC), and potassium chloride extractable nitrogen () in a soil to which three animal manures viz. cow dung (CD), chicken manure (CM)\rand a combination of CD and CM had been applied at a rate of 10 t·ha－1.\rThe effects of manures varied with manure type and incubation period. Soil pH\rslightly increased with the incubation period up to 30 days there after it\rdeclined with time significantly (p increased\rsignificantly (p contents when\reither chicken manure alone or cow\rdung and chicken manure mixed in combination. After 60 days of incubation, the highest amount of was found in\rcow dung plus chicken manure treated soil followed by chicken manure treatment.