Abstract
Application of animal manures influences enzymatic activities and microbial dynamics in soils. Poultry manure (PM) and swine manures (SM) were applied at the rate of 30 t ha−1 each. The experiment was arranged in a randomized complete block design with three replicates. Soils were sampled at day 0, 14, 28, 42, 56, 70 and 84 from 0-15 cm and 15-30 cm depths. In both the PM and SM amended soils, significant increase in soil pH was observed. In PM treated soil, alkaline phosphatase significantly increased from 0.38 Mg g-1 to 4.94 Mg g-1 whereas in SM treated soil, it increased from 1.21 Mg g-1 to 4.80 Mg g-1. Acid phosphatase significantly increased from 0.42 Mg g-1 to 3.02 Mg g-1 in PM amended soil while increases from 0.11 Mg g-1 to 2.38 Mg g-1 were observed in SM amended soil. The application of PM and SM increased Total Heterotrophic Bacterial Count significantly from 1.27×104 Cfu g-1 to 8.63×107 Cfu g-1 and from 1.40×104 Cfu g1 to 8.10×107 Cfu g-1, respectively. Total Fungal Count significantly increased from 1.63×103 Cfu g-1 to 4.67×106 Cfu g-1 and from 2.00×103 Cfu g-1 to 5.67×106 Cfu g-1 in PM and SM amended soils, respectively.
Highlights
The increase in human population has resulted to decrease in soil fertility due to continuous cropping in order to meet up with food needs of the growing population
Cured poultry and swine manures obtained from University of Uyo Teaching and Research Farm were applied in their natural state at the rate of 30 t ha-1 each
Colorimeter was used to obtain the value for phosphomonoesters at the wavelength of 420 nm, and the result recorded as Mg g-1 soil
Summary
The increase in human population has resulted to decrease in soil fertility due to continuous cropping in order to meet up with food needs of the growing population. Bacteria and actinomycetes are the dominant microbial species in the decomposition of animal manures (Karnchanawong and Nissaikla, 2014). These microbial degradation activities are made possible by the activities of enzymes through hydrolysis of complex macromolecules present during metabolism of organic manures (Delgado et al, 2004). There is no specific information on the changes of phosphates activity and microbial population dynamics in soils as the manures are mineralized. Dynamics Of Phosphatase Enzyme And Microbial Properties In A Degraded Ultisol Amended With Animal Manures. To address the paucity of information on changes in phosphates and microbial dynamics following organic amendment in the soil of the study area
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