Glufosinate Effects on Nitrogen Nutrition, Growth, Yield, and Seed Composition in Glufosinate-Resistant and Glufosinate-Sensitive Soybean

Table 1

Glufosinate effect on plant injury, chlorophyll content, and yield in glufosinate-resistant, glyphosate-resistant, and conventional soybean in a field study at Stoneville, MS, 2009 and 2010^a.

Herbicide	Rate (g/ha)	Application timing	Plant injury (%)	Chlorophyll (mg/g leaf)		Soybean yield (kg/ha)
			3 d EPOST	3 d EPOST	14 d EPOST
Glufosinate-resistant soybean
No glufosinate	0		0^a	1.63^a	1.74^a	3749^a
Glufosinate fb	450	EPOST	3^a	1.50^a	1.86^a	3812^a
glufosinate	450	LPOST
Glyphosate-resistant soybean
No glufosinate	0		0^b	1.43^a	1.69^a	4911^a
Glufosinate	45	EPOST	28^a	0.93^b	1.56^a	4910^a
Conventional soybean
No glufosinate	0		0^b	1.58^a	1.56^a	3394^a
Glufosinate	45	EPOST	32^a	0.92^b	1.57^a	3379^a

Abbreviations: fb: followed by; EPOST: early postemergence applied at 3 wk after planting; LPOST: late postemergence applied at 6 wk after planting.
^aMeans within a column for each soybean type followed by the same letter are not statistically significant at the 5% level as determined by Fisher’s LSD test.