Measurements were made using a Licor-brand LAI-2200 device at approximately weekly intervals during the 2012, 2013, and 2014 growing seasons. At each point, the measurements are the average LAI value calculated from 20 subcanopy measurements ranging from in-line with planted rows to the area between rows. In 2012 and 2013, measurements were taken exclusively during diffuse light conditions (sunrise, sunset, or full cloud cover). In 2014, measurements were taken during daylight hours and corrected for light scattering using the LAI-2200C correction described on their website. This means that 2014 data is less accurate than 2012-2013 data. Note that, for each growing season, a date is listed with 0 LAI – this corresponds to the date prior to emergence at each site.After installation of wells and soil monitoring gear in each of the 2012, 2013, and 2014 growing seasons, we used a Topcon GR5 RTK-GPS to collect the location of each relevant point within the field. In 2014, a gridded set of soil sampling points was also measured.