Why Not Keep Growing Potatoes?

Rating: 7/10 (20 October 2019)

I watch this movie often for it's problem solving plot line. However, a few things are missing, like character development. We only see bits of the crew's reaction to Watney's death, and not even a glimpse of Watney's mom and dad, the could have at least been watching on TV with the rest of America, so the movie comes off a little staid. The inner ship Hermes views are really fun to see.
Even in the problem solving, though I find issues. The major one is about the loss of the potato crop. Watney started out with whole potatoes and human waste as fertilizer. The crops and fertilizer were destroyed, but Watney still had potatoes, and tuh, he still had fertilizer in the supply from one human per day (at the least). Therefore he still had the means to build up a potato plant, even one per day until he had a new crop. Do the math, people. 1 potato + one human fertilizer per day x 365 days equals a lot of potatoes! But that wouldn't help a plot line. LOL.