Effects of Herbicides on the Microbial Community and Urease Activity in the Rhizosphere Soil of Maize at Maturity Stage

Table 5

Effects of herbicides on the urease activity in the rhizosphere soil of maize.

Treatment	Soil layer (cm)
	0-20		20-40		40-60
	Measured value (mg g^-1)	△CK%	Measured value (mg g^-1)	△CK %	Measured value (mg g^-1)	△CK %
CK		—		—		—
A0		-38.6		-33.1		-30.5
A1		-18.8		-15.6		-6.3
A2		2.7		15.0		27.1
A3		-8.0		10.2		19.8
A4		-15.4		-2.2		13.6

Note: CK, the no herbicide negative control; A0, a preemergence nonspecific herbicide for maize, dinitraniline (the active control); A1-A4: four preemergence maize specific herbicides, nicosulfuron+atrazine, alachlor+acetochlor+atrazine, propisochlor+atrazine, and acetochlor+atrazine, respectively. Data in the table are (), different lowercase letters in the same column indicate significant difference () between treatments, and different capital letters in the same row indicate significant difference () between layers based on the LSD test.