Mineral Nitrogen and Microbial Biomass Dynamics under Different Acid Soil Management Practices for Maize Production

Richard Onwonga, Joyce Lelei and Benson B. Mochoge

Journal of Agricultural Science, 2010, vol. 2, issue 1, 16

Abstract: Field and laboratory incubation studies were conducted to determine the effect of different acid soil managementpractices; liming (L), combined N and P fertilizers (NP), and goat manure (M) application, for maize production on thedynamics of mineral N, microbial biomass nitrogen (MBN) and microbial biomass carbon (MBC). A randomisedcomplete block design with a 23 factorial arrangement replicated thrice was used. The factors, each at two levels, were-NP fertilizers applied as triple superphosphate (0 and 75 kg ha-1), and urea (0 and 50 kg ha-1), L (0 and 2.5 t ha-1) and M(0 and 5 t ha-1) giving a total of eight treatments; L, M, NP, LM, LNP, MNP, LMNP and C (control). Soil samples fordetermination of mineral N, MBC and MBN were collected from the 0-15 and 15-30 cm depths at seedling, tasselling,and maturity stages of maize growth and after 0, 15, 30, 60, 120 and 240 days of laboratory incubation of soils obtainedfrom the same field.The NP treatment had significantly (P

Date: 2010
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