The Synchrony Mechanisms of Green Manure-Derived Nitrogen Release and Winter Wheat Nitrogen Uptake on the Loess Plateau

Fig. S1 The precipitation and temperature variations during the experiment. Fig. S2 Effects of different cover crops on soil nitrogen fractions concentration. Bars associated with different letters at the top within the same stage are significantly different among cover crops (P < 0.05, ANOVA, Tukey HSD). Error bars are from mean of four replications. Treatments are CK, no cover crop; SB, soybean; SG, sudangrass. STN, soil total nitrogen; PON, soil particulate organic nitrogen; MBN, microbial biomass nitrogen; NO3−-N, nitrate nitrogen; NH4+-N, ammonium nitrogen.Table S1 The δ15N values in wheat components at different stages.​Table S2 The δ15N values in soil N fractions at different stages.​