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. 2018 Oct 1;9:1452. doi: 10.3389/fpls.2018.01452

FIGURE 5.

FIGURE 5

Correlation between crop duration and grain yield in the field. Crop duration and grain yield of 15 Indica rice genotypes was measured in the field without added N (N0) or with 100 kg/ha urea N (N100) for 6 seasons over 3 years, and their mean values were used for correlation analysis. (A) Correlation between crop duration and total grain yield was significant in N0 but not in N100. (B) Negative correlation between crop duration and % yield change or loss in N0, relative to N100 [(N100 yield–N0 yield)∗N100 yield/N100 yield], indicating higher N use efficiency at longer crop duration. The significance levels are shown as stars next to R2 values. ∗Denotes significant at P < 0.05, ∗∗denotes significant at P < 0.01, and ns denotes non-significant.