461894.fig.003a
(a)
461894.fig.003b
(b)
Figure 3: Soybean grain yield response to K-fertilizer additives (%N-%P2O5-%K2O-%S) of 3-18-18-0 ( , ), 0-0-25-17 ( , ), 5-0-20-13 ( , ), or 0-0-62-0 ( , ) applied alone to weed-free plots (a) and with glyphosate to weedy plots (b) for 3-18-18-0 ( , ), 0-0-25-17 ( , ), 5-0-20-13 ( , ), and 0-0-62-0 ( , ) at Portageville in 2004 and 2005. Data were combined over years, and comparisons between figures are valid. The nontreated, weed-free, and glyphosate plus nonionic surfactant plus diammonium sulfate grain yields were 1160, 2640, and 2120 kg ha−1, respectively. The LSD ( ) was 670 kg ha−1.