Fig. 4: Data collection from an on-farm, multi-N, multi-hybrid experiment on 6 July in Indiana and 22 July in Nebraska during 2021. | Communications Biology

Fig. 4: Data collection from an on-farm, multi-N, multi-hybrid experiment on 6 July in Indiana and 22 July in Nebraska during 2021.

From: Breaking the field phenotyping bottleneck in maize with autonomous robots

Fig. 4

A Layout of multi-N treatments across a farmer’s field in southern Indiana. Colors indicate the N rates of 0, 67, 134, 202, and 269 kg N ha−1 applied at planting. The length of each experimental strip is provided for reference. B Leaf area index and grain yield produced at the field trial shown in (A) and a similarly-designed trial in Nebraska. Fitted trait responses were significantly different between the two locations for both grain yield (p-value < 0.001) and LAI (p-value of 0.0085). C ANOVA for yield and LAI response to State, Nitrogen, Hybrid, and interaction effects. D Regression analysis supports a strong linear relationship (R2 0.957, p-value < 0.001) between green leaf area index and grain yield using N treatment and hybrid mean values from the Indiana and Nebraska locations.

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