Table 6 Regression equations and statistics for change in residue C:N ratio over 112 days, where X = time in days after application

Maize, buried

y = 35.04e^−0.0040x + 20.94e^−0.0579x

Maize, surface

y = 40.56e^−0.0020x + 14.66e^−0.0586x

Sorghum sudangrass, buried

y = 21.44e^−0.0021x + 10.03e^−0.3034x

Sorghum sudangrass, surface

y = 31.27 − 0.2126x

Common bean, buried

y = 21.88 + 32.50e^−0.0283x

Common bean, surface

y = 17.26 + 41.10e^−0.0093x

Sunn hemp, buried

y = 11.04e^−0.0623x + 21.85e^−0.0048x

Sunn hemp, surface

y = 20.26e^−0.0006x + 9.98e^−0.3873x