Abstract:
Twelve weeks laboratory incubation experiment was carried out to: (1) determine variations in N mineralization of various manures (chicken manure, farm yard, pigeon, guano & sewage sludge) and to (2) examine the relationship between N mineralization and initial chemical composition. Manures were aerobically incubated in two types of soils (saline & nonsaline) at a rate of 200 mg N kg-1 soil and mineral N was monitored after 0, 2, 4, 6, 8, 10 and 12 weeks. With the exception of sewage sludge and pigeon manure, NO3-N was the dominant form of mineral N. Net N released from the manure in the saline and non-saline soils was negatively correlated with initial N content, C/N ratio and lignin (r2 = -0.837/-0.385, -0.719/-0.095, - 0.448/-0.903), respectively. Cellulose and hemicellulose in saline soils were positively correlated with net N released (r2=0.558 & 0.613), however in non-saline soils net N released was positively correlated with cellulose (r2 = 0.899) and negatively with hemicellulose (r2 = -0.118). It could be concluded that monitoring mineral N release during decomposition of manures is a useful tool for fertilization programs that include incorporation of organic sources of N.
Page(s):
515-520
DOI:
DOI not available
Published:
Journal: International Journal of Agriculture and Biology, Volume: 11, Issue: 5, Year: 2009