New processes in general take a while to propogate.

* working in a study is different from working on every field in the country, and some things are harder to put into practice than other

* some people have the mindset of, if it ain't broke, don't fix it, which is pretty easy to justify given how precarious and time-consuming of a lifestyle farming already is

* in particular, for changes that need capital investment, the precariousness of the field means that it can take time to secure the money to spend on major improvements