International Journal of Agronomy / 2011 / Article / Tab 5

Research Article

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

Table 5

Effect of glufosinate application on leaf and seed nitrogen content and delta 15N in glufosinate-resistant, glyphosate-resistant, and conventional soybean in a field study at Stoneville, MS, 2009 and 2010a.

HerbicideRate (g/ha)Application timingNitrogen content (%)Delta 15Nb
Leaf at V5Leaf at R4Seed

Glufosinate-resistant soybean
 No glufosinate04.84b5.64a6.22b0.20a
 Glufosinate fb450EPOST5.23a5.87a6.38a0.21a
 glufosinate450LPOST
Glyphosate-resistant soybean
 No glufosinate05.17a5.85b6.49a0.83a
 Glufosinate45EPOST5.13a6.05a6.64a0.76a
Conventional soybean
 No glufosinate05.31b5.06b6.30a0.55a
 Glufosinate45EPOST5.78a5.39a6.25a0.69a

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.
b Delta 15N was determined in leaf samples taken at R4 soybean growth stage.

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