Physical-chemical and microbiological changes in Cerrado Soil under differing sugarcane harvest management systems

Table 2 Contents of NH₄⁺-N, NO₃^--N, net rates of N mineralization and nitrification in the soil and denitrifier enzyme activity (DEA) of the soil (0–10 cm)

Treatment	NH₄⁺-N	NO₃^--N	Mineralization	Nitrification	DEA
	mg kg^-1dried soil		mg kg^-1dried soil day^-1
Control	9.6 (1.5)^a	1.3 (0.5)^b	2.6 (0.5)^a	2.6 (0.4)^a	2.6 (0.3)^a
Green cane	13.5 (12.1)^ab	32.6 (27.9)^a	−4.2 (6.0)^b	−2.5 (3.9)^b	0.1 (0.0)^b
Burnt cane	1.9 (0.9) ^b	26.6 (15.9)^a	−0.5 (0.8)^b	0.4 (0.8)^b	0.1 (0.0)^b

The numbers represent average values (n = 3 for DEA and n = 5 for the rest) followed by their respective standard deviations in parentheses. Averages followed by the same letter in each column are not statistically different from each other according to the Tukey test (5%) for DEA and the Kolmogorov-Smirnov test (5%) for the rest.

ISSN: 1471-2180