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

Table 3

Glufosinate effect on shoot, root, and nodule biomass, nitrogenase activity, and root respiration in glyphosate-resistant soybean under field conditions in 2009 and 2010.

Year	Sampling time	Glufosinate; rate (g/ha)	Dry biomass (mg/plant)			Nitrogenase activity (μmol ethylene formed/plant/h)	Root respiration (μmol CO2/plant/h)
			Nodule	Shoot	Root
2009	3 DAT	0	30	1472	381	2.16	26.8
		45	46	1355	358	2.98	28.8
		P	0.22	0.24	0.31	0.63	0.39
	12 DAT	0	66	3575	748	5.40	53.0
		45	50	3841	661	4.00	46.7
		P	0.15	0.41	0.23	0.05	0.16
2010	3 DAT	0	52	2060	303	3.66	38.3
		45	34	1366	271	2.10	26.3
		P	0.008	0.01	0.26	0.004	0.01
	12 DAT	0	73	3885	520	19.30	156.6
		45	61	2570	393	20.80	146.5
		P	0.08	0.02	0.005	0.68	0.36

Abbreviations: DAT: days after early postemergence application.