Table 4
Effect of nZnO levels on cumulative gas volume and gas concentrations (n = 4 observations/treatment)

EffectsAlfalfaMaize silageControl100 μg g− 1200 μg g− 1500 μg g− 11000 μg g− 1SEMaP value
FeednZnONZnOaFeed
Total Gas (mL)41.09x72.77y58.17a55.88a55.88a57.99a58.17a5.71<.00010.8750.542
CH4 (%)10.69x9.47y12.68a11.52ab10.18bc9.26c6.74d1.440.0114<.00010.479
CO2 (%)48.78x45.55y56.21a53.46ab50.06b43.93c32.16d4.510.0314<.00010.948
H2S (ppm)3420x1314y3150a2856a2431b1936c1460d298<.0001<.0001<.0001