Table 2.

ANOVA for soil edaphic factors at 2, 8 and 15 days after urea application from all samples (see Fig. 1). Mineral N = NO₃⁻ + NO₂⁻ + exchangeable NH₄⁺

Source of variation	d.f.	pH	mineral N	NO3−	Exchangeable NH4+
Time	F2, 45	NS	8.17, P < 0.001	45.42, P < 0.001	3.61, P = 0.035
Treatment	F4, 45	10.79, P < 0.001	57.09, P < 0.001	31.9, P < 0.001	73.04, P < 0.001
Time × Treatment	F8, 45	NS	NS	NS	2.35, P = 0.033

NS not statistically significant