"..have to borrow before every planting"
This is not limited to just small farms. In Western Australia, farm debt has been growing 8% per annum since 2000. The average farm size here is ~3500ha (8650acres).
It'll be interesting to see if California farms' debt balloons like this too as they have to borrow more and more to pay for water rights and infrastructure like wells. California is basically the US's fertile crescent so maybe there will be a lot more subsidies and federal assistance just to maintain food security as a national strategic goal.
[1] https://en.wikipedia.org/wiki/2000s_Australian_drought
[2] http://www.theage.com.au//breaking-news-national/minister-de...