IJSRP, Volume 5, Issue 11, November 2015 Edition [ISSN 2250-3153]
Zakari H. A, Jibrin Mohammed, and Ahmad R.S
The increase in use of manure requires a knowledge on the fate and distribution of residual manure Cn and Zn in soils around dumpsites. To address this issue, amounts of soil Cu and Zn in the different organic and inorganic fractions were investigated in soil under long term dumping of industrial and animal wastes, especially swine and cattle manure and in two plots that are under intense vegetation around the dumpsites. The annual rates of manure application were based on the N contents in the various manures, and were approximately equivalent to 0, 50, 10, and 300 1G total N ha-1 y-1 in the vegetated area and 0, and 50 kg total N ha-1 y-1 in the grassland plot. In both the field plot and grassland manure plots there were insignificant increase in total Cu and Zn in soils associated with manure application. Moderate increases in labile Cu and Zn were observed in treatment with large amount of animal manure. The liquid swine manure had less effect than the cattle manure on increasing the labile Cu and Zn fraction. The results indicate that annual addition of animal manures at rates approximately 100kg N ho-1 for about 4 years does not constitute an environmental risk from Cu and Zn loading in these soils.