How come my wheatgrass plant didn't grow as well as this one?

Question

So i did a lab.

with

a wheatgrass that had full organic sand

and one that had 1/2 sand half soil. Why didn't the one with sand grow longer than the one with half of them?

Answer 1

Wheatgrass grown only on sand will not grow healthy as compared to that grown on sand soil mixture.  Soil offers the salts to the growing plants in dissolved form. It also offers a firm support to the growing plants. Sand cannot give any of these to the plants.

Answer 2

Along with numerous micronutrients, the three main macronutrients a plant need from the soil are: nitrogen, potassium, and phosphate. Organic soil represents all the plant nutrients the plant needs for maximum growth, and in this case with the wheatgrass the sand did not hold as many nutrients to promote growth.

Answer 3

sand is rocky and so yeah its bad

Answer 4

sand is bad for the wheat grass, it messes up the particles of the seeds and makes them grow less because the receptors of the plant are getting irritated