Sources of Nitrate in Ground Water Aquifers of the Semiarid Region of Tanzania

Figure 3

The logarithmic distribution of (a) nitrates (ppm), (b) nitrite (ppb), and (c) ammonium (ppb) in shallow wells of Singida and Manyoni towns and peri-urban areas during the dry and wet seasons.

(a)

(b)

(c)