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Blacksburg, Virginia - Virginia Tech

Blacksburg, Virginia - Virginia Tech

Southern Piedmont In

Southern Piedmont In 2009, biomass yield from the Southern Piedmont location showed significant N rate x N source interaction (p = 0.0335) and therefore interaction means are presented (Figure 3-7). Quadratic response to increasing N rate was observed for both N sources (Figure 3-7). Unlike the Blacksburg location, at this location, differences in N sources were observed in 2009. This difference in N source was shown by the difference in DM yield increase for each unit of N applied. The high yield response to N rate and source can be attributed to both adequate rainfall during the early growing season and the timely availability of ammonium nitrate versus broiler litter. Overall in 2009, biomass yield ranged from 1417 to 6151 kg DM ha -1 . In 2010, N source x N rate interaction effects were not significant at the Southern Piedmont thus, results are presented by the main effects. Biomass yield showed no response to N source (Figure 3-8B) or an increasing N rate (Figure 3-8A). The yield response, or lack there of in 2010 was most likely due to the severe drought experienced at the Southern Piedmont location throughout the 2010 growing season. Biomass yield ranged from 3285 to 4922 kg DM ha -1 . Overall, in 2009, the yield response to both N rate and source was similar for Blackstone and Blacksburg locations. However, in 2010, no yield response to N rate and source was observed, most likely due to a lack of rainfall at the Blackstone location (Figs. 3-8 A and B). 35

Total Yield (kg DM ha -1 ) 8000 6000 4000 2000 0 Broiler Litter Ammonium Nitrate y = 2401.27 + 53.58x - .23x 2 r 2 = 0.9325 p < 0.0001 y = 2212.31 + 23.83x – 0.04x 2 r 2 = 0.8175 p < 0.0001 0 20 40 60 80 100 120 140 Nitrogen Rate (kg N ha -1 ) Figure 3-7. Biomass yield response to N Rate x N source treatment at the Southern Piedmont, 2009. 36

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