So in my own personal calculus journey I took applied calculus ~20 years ago and am currently about to start the final week of an equivalent course I am retaking because I didn't really do that well at it twenty years ago. The trajectory of the result is suboptimal and I suspect a B or C grade may be the result but the real pain is that I am not going to quite obtain mastery, though another 5 weeks or so of self study might rectify the difference.

This question I asked here is central to the question of if I should devote more time to studying calculus. So far what I have found is that calculus may not be important to the mathematics of plant breeding. However it may be important to plant ecology, it may have applications in statistics, and it may have applications in plant physiology such as water potential. All of which can be applied back to plant breeding.

For instance several of us are growing domestic hybrids, Solanum penellii, and interspecies hybrids between the two. It seems to me that we've thus created three populations for comparison. If we want to know if a subset or selection of the interspecies hybrids retain some of the superpowers of Solanum penellii we may be able to make some comparisons using calculus. My calculus text has a section on probability distributions and there is an example regarding comparing normal curves (this would be integrals). So if we collect data in regards to growth rate, reproductive output, water potential, or ? we might be able to compare the statistical distribution of those data using integrals, and find individuals within the hybrid population that have the traits we are seeking. So maybe not important to the actual breeding, but could inform our understanding of which individuals or subpopulations to move forward with IF we are strictly trying to retain some superpower such as extreme drought tolerance.

Notably our populations of the species tomatoes seem to be rapidly adapting to our gardens. In so doing are they losing their super powers? Possibly statistical analysis using integral calculus could give us answers.

Though some of you out there may already have a much higher degree of calculus mastery than I have ever obtained. Does any of this seem reasonable?

Calculus can be thought of as the mathematics of change with differentials being instantaneous change and integrals accumulated change. Can that be used to compare plant populations within a meta population I.E. the 14 species tomato complex?

A quick search for comparative physiology of tomato species found this summary of a paywall blocked paper

https://www.tandfonline.com/doi/abs/10.1080/14620316.1994.11516495 on comparative salt responses on domestic, penellii, and the hybrids.