I have been trying to find literature values for reflectance of soybean for different dates along the growing season (I am specifically interested in 30, 60 and ~120 days after planting - so the V3/V4 stage, R3/R4 stage and R8 stage) but all the spectral response graphs (there's only graphs - I haven't seen a table) that show up in my literature search have "Average Spectral Response" and no date indicated. There is a 1984 dataset on the NASA website which has measurement dates mentioned - but no mention of planting date, and the reflectance data doesn't mention the measurement dates either.
Is there a paper or some other resource where I could find such data? I should add that this is for remote-sensing work, hence why I want data for different dates - I want the presence of soil to be accounted for in the reflectances reported.
reflectance of soybean growth
(ncbi.nlm.nih.gov/pmc/?term=reflectance+of+soybean+growth) yields for example entries like ncbi.nlm.nih.gov/pmc/articles/PMC3784907, and ncbi.nlm.nih.gov/pmc/articles/PMC5095887 pointing to the updates on nass.usda.gov/Research_and_Science/Cropland/metadata/meta.php - what if they know a source? $\endgroup$