International Journal of Current Microbiology and Applied Sciences

ISSN: 2319-7706 Volume 2 Number 10 (2013) pp. 452-466

Contribution of Fungal Inoculation in Degradation of Organic Residues and Nitrogen-mineralization Using 15N Technique

Ahmed. A. Moursy* and H.A. Abdel Aziz

Atomic Energy Authority, Nuclear Research Center, Soil & Water Research Department Abou-Zaabl, 13759, Egypt

ABSTRACT

A laboratory incubation experiment was carried out to evaluate organic residue decomposition and NO3-N and NH4-N release in the media. Nitrate content tended to increase by increasing incubation intervals up to 45 days then gradually decreased with 60 day up to 90 days when soil amended with maize stalks. The highest decrease in NO3-N was at 90 days of incubation. NH4 -N in soil was affected by organic sources and microbial inoculants. And tended to decreased by increasing incubation intervals up to 15 days then gradually decreased often 30 day up to 90 days. The highest reduction in NH4-N was detected at 90 days of incubation. Organic-N content tended to gradually decrease by increasing incubation intervals up to 90 day. The highest decrease in organic-N was detected often 90 days of incubation. Significant variation in C/N ratio occurred with time, fungi inoculation and organic amendment, on day 1, a higher C/N ratio was detected with wheat straw as compared to other treatments whereas the lowest one was recorded with chickpea straw

Keywords

Plant residues; No3-N; NH4- N; 15N technique; organic-N