In the experiments show in table 1 and figure 1, by measuring the rate at which Fe

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.