Soil NH₃ volatilisation rates (A and B) and changes in cumulative NH₃ volatilisation (C and D) following basal fertilisation.

<p>CCF, common compound fertiliser; CRF, a resin-coated CRF; SCF, a sulphur-coated CRF; CCF, applied at 1250 kg ha⁻¹ (the local average commercial fertiliser N application rate); CRFI, CRF applied at 714.29 kg ha⁻¹ (50% CCF), CRFII,1071.43 kg ha⁻¹ (75% CCF), CRFIII, 1428.57 kg ha⁻¹ (100% CCF); SCFI, SCF applied at 833.33 kg ha⁻¹ (50% CCF), SCFII, 1250 kg ha⁻¹ (75% CCF), SCFIII, 1666.67 kg ha⁻¹ (100% CCF); CK, control plots without N application. Error bars are SE (n = 15; some SE bars are smaller than the symbols).