ISSN 2756-3863
International Journal of Manures and Fertilizers Vol. 2 (6), pp. 337-343, June, 2013. © International Scholars Journals
Full Length Research Paper
Farm Practices and fertilizer effect on soil microbial biomass and respiration, and on enzyme activities
Bagheri G.Hatami and Ahmed Arsham and Arya Hesamedin
Department of Horticulture, Faculty of Agriculture, Urmia University, Urmia, West Azerbaijan Province, Iran. E-mail: [email protected].
Accepted 29 May, 2013
Abstract
Application of liquid pig manure on soil for agricultural use increases the organic matter content and constitutes an important input of nutrients into the soil, increasing microbial activity through the direct addition of nutrients and microorganisms. The objective of this study was to determine the influence of both tillage and liquid pig manure application on soil microbial biomass, enzyme activities and microbial respiration in a meadow soil. The results obtained did not show any significant effect of tillage and manure on microbial biomass carbon (C) and nitrogen (N) nor on soil acid phosphatase activity. However, these treatments significantly increased microbial biomass P, urease, alkaline phosphatase and ammonification rates. The maximum microbial activity was observed in surface soil layer both under conventional tillage and zero-tillage. In fact, microbial respirations (CO2) of bacteria and actinomycetes were higher in the surface soil and increased with the level of manure. Tillage and manure application had no significant effect on fungal respiration but interaction between tillage and manure application significantly influenced soil urease and ammonification rates. Hence, we suggested that soil microbial biomass and enzyme activities were closely correlated to the N mineralization potential, N and C mineralization rates, total amounts of C or N, soil pH, ammonification rates and soil structural stability.
Key words: Microbial biomass, enzyme activities, respiration, pastures soil.