Variations in nitrogen mineralization from different manures in semi-arid tropics of Sudan with reference to salt-affected soils
2009
Yousif, A.M. (University of Kordofan, Elobeid (Sudan). Dept. of Soil and Water Sciences) | Mubarak, A.R. (University of Khartoum, Shambat (Sudan). Desertification and Desert Cultivation Studies Inst.)
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 & non-saline) at a rate of 200 mg N per kg 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 wi th 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.
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