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

Table 2

Glufosinate effect on shoot, root, and nodule biomass, nitrogenase activity, and root respiration in glufosinate-resistant soybean under field conditions in 2009 and 2010. Data represent the mean of 3 and 12 d after early postemergence application in 2009 and 2010.

Application timing	Glufosinate rate (g/ha)	Dry biomass (mg/plant)			Nitrogenase activity (μmol ethylene formed/plant/h)	Root respiration (μmol CO2/plant/h)
		Nodule	Shoot	Root
EPOST	0	45	2133	445	6.6	62.6
	450	44	2106	441	6.7	64.9
	P	0.98	0.87	0.87	0.59	0.14
LPOST	0	77	3435	559	9.6	75.7
	450	77	3260	508	10.5	74.8
	P	0.98	0.35	0.23	0.59	0.78

Abbreviations: fb: followed by; EPOST: early postemergence applied at 3 wk after planting; LPOST: late postemergence applied at 6 wk after planting.