Table 3: In-situ decay coefficients (k-values) per degree day (dd-1) for the three grass species at both upstream and downstream locations in River Nyangores during the study period.

Grass species k-values
(x 10-4 dd-1)		 (r2) k-values
(x 10-4 dd-1)		 (r2)
Upstream Downstream
Chloris gayana 8.33165* (0.978) 9.12355* (0.944)
Panicum coloratum 8.31603* (0.970) 8.60599* (0.979)
Pennisetum purpureum 6.70795* (0.929) 7.00954* (0.949)

*Decay coefficients significant with analysis of covariance (p<0.05).