Extended Data Fig. 4: Performance of Fertilizer Recommendation based on soil Nutrient Monitoring (FRNM) technique and integrated soil-crop system management (ISSM) technique.
From: Data-driven nitrogen management benchmarks support China’s wheat self-sufficiency by 2030
Comparison of wheat grain yield and N surplus between farmer’s practice and FRNM technique (a–b; n = 246), and between farmer’s practice and ISSM technique (c–d; n = 65). “n” indicates the number of site-year field trials on applying FRNM and ISSM techniques. Solid and dashed lines indicate the median and mean, respectively. The box boundaries indicate the 75% and 25% quartiles, and the whisker caps indicate the 95th and 5th percentiles. P values were obtained from two-sided paired t-test, and no adjustments were made for multiple comparisons.
