Figure 2

Effects of returning cover crop on NO3āN (a) and NH4+-N (b) content of paddy soil at different growing stages. Bars represented by different letters are significantly at Pā<ā0.05, whereas error bars represent ±SE of triplicated data.
Effects of returning cover crop on NO3āN (a) and NH4+-N (b) content of paddy soil at different growing stages. Bars represented by different letters are significantly at Pā<ā0.05, whereas error bars represent ±SE of triplicated data.