Fig. 1.

The influence of N rate, year, and water stress on the whole field (SI-NDVIwf) and management zone (SI-NDVImz) sufficiency indexes at the erect/stem extension growth.

 


Fig. 2.

The relationship between N induced yield increases (yield in well fertilized plots – yield in underfertilized plots) and sufficiency index-normalized different vegetation indices (SI-NDVI) calculated using the whole field and management zone approaches at the erect/stem extension and flag leaf growth stages.