It is also often difficult to determine the exact factor limiting growth. Many different factors may combine to produce unexpected results. Limitations to population growth are either density ...

These are also known as limiting factors. They can limit the rate of photosynthesis if it is in short supply. OK, well I guess farmers can't control these limiting factors outside, can they?

It is also often difficult to determine the exact factor limiting growth. Many different factors may combine to produce unexpected results. Limitations to population growth are either density ...