With the application of nitrogen fertilizer, more significant increases in crop yields were
observed in both biochar treatments (Figure 10). In the absence of biochar, for example, an
approximate 25% increase in yield was obtained when 50% or 100% nitrogen fertilizers
were used. When the use of biochar was integrated with fertilizer, the crop yield increased
by approximately 54% and 39% for biochar-A and biochar-B in the 50% fertilizer
treatment, respectively, and 72% and 44% in 100% fertilizer use, respectively. Similar
synergetic effects have also been reported in previous field (Yamato et al., 2006) and
greenhouse experiments (Chan et al., 2007 and 2008). The results further confirm that
biochar as soil amendment can efficiently utilize the nutrients by holding ammonium ions
in soils and inhibiting nitrogen fertilizer nitrification (Spokas et al., 2009).
With the application of nitrogen fertilizer, more significant increases in crop yields wereobserved in both biochar treatments (Figure 10). In the absence of biochar, for example, anapproximate 25% increase in yield was obtained when 50% or 100% nitrogen fertilizerswere used. When the use of biochar was integrated with fertilizer, the crop yield increasedby approximately 54% and 39% for biochar-A and biochar-B in the 50% fertilizertreatment, respectively, and 72% and 44% in 100% fertilizer use, respectively. Similarsynergetic effects have also been reported in previous field (Yamato et al., 2006) andgreenhouse experiments (Chan et al., 2007 and 2008). The results further confirm thatbiochar as soil amendment can efficiently utilize the nutrients by holding ammonium ionsin soils and inhibiting nitrogen fertilizer nitrification (Spokas et al., 2009).
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