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Blacksburg, Virginia - Virginia Tech

Blacksburg, Virginia - Virginia Tech

kg -1 ) Nitrates (mg NO

kg -1 ) Nitrates (mg NO 3 20000 15000 10000 5000 0 Broiler Litter Ammonium Nitrate y = 2342.28 + 102.08x – 0.65x 2 r 2 = 0.4735 p = 0.0154 0 20 40 60 80 100 120 140 N Rate (kg N ha -1 ) Figure 3-12. The effect of N rates and sources on nitrate accumulation for the first harvest at Kentland, 2010. kg -1 ) Nitrates (mg NO 3 20000 15000 10000 5000 0 Broiler Litter Ammonium Nitrate y = 1411.46 + 0.65x – 0.06x 2 r 2 = 0.3606 p = 0.0547 0 20 40 60 80 100 120 140 N Rate (kg N ha -1 ) Figure 3-13. The effect of N rates and sources on nitrate accumulation for the second harvest at Kentland farm in 2010. 53

Southern Piedmont In 2010, significant N rate x N source interactions were present for both harvest dates (Harvest 1: p = 0.0823; Harvest 2: p = 0.0035), therefore interaction means are presented. Both N sources showed quadratic response to increasing N rates for harvest one at the Southern Piedmont in 2010 (Figure 3-14). In harvest two, however AN responded quadradically while BL responded linearly (figure 3-15). Nitrate accumulation level in teff was at a dangerous level from the first harvest for both sources of N at the at the 45 kg N ha -1 rate and higher (Table 3-8; Figure 3-14). Nitrate levels in teff from second harvest at the 90 and 135 kg N ha -1 rates showed nitrate accumulation levels are within the dangerous to livestock range (Table 3-8; Figure 3-15). kg -1 ) Nitrates (mg NO 3 20000 15000 10000 5000 0 y = 4152.08 + 121.39x – 0.50x 2 r 2 = 0.6716 p = .0007 0 20 40 60 80 100 120 140 160 N Rate (kg N ha -1 ) 54 y = 2962.27 + 18.72x + 0.36x 2 r 2 = 0.7533 p = 0.0001 Broiler Litter Ammonium Nitrate Figure 3-14. The effect of N rates and sources on nitrate accumulation for the first harvest at the Southern Piedmont, 2010.

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