Interactions of Nitrogen Source and Rate and Weed Removal Timing Relative to Nitrogen Content in Corn and Weeds and Corn Grain Yield

Table 1

Large crabgrass density as influenced by year, location, N source, and average height of weeds at timing of removal.

Nitrogen source	Average weed height at timing of weed removal; (cm)	2011		2012
		Clayton	Rocky Mount	Clayton	Rocky Mount
		Number/0.25/m^2
Urea ammonium nitrate	8	89	27	104	85
Urea ammonium nitrate	16	36	19	87	2
Sulfur-coated urea	8	82	37	244	119
Sulfur-coated urea	16	47	26	68	1
Composted poultry litter	8	71	39	250	66
Composted poultry litter	16	50	32	64	2

Means within a year and location combination followed by the same letter are not significant according Fisher’s protected LSD test at . Data are pooled over N rates.