Figure 6

Total grain yield of the four studied seasons as influenced by different treatments. CK is control, BC1 is 7.5 t ha−1 biochar, BC2 is 15 t ha−1 biochar, BC3 is 30 t ha−1 biochar, FA is 1.5 t ha−1 fulvic acid. Values are means ± SE (n = 3). For each season, bars within each panel with different letters are significantly different according to LSD at p < 0.05 level.