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Rotation was/is used to help with weed and insect control, and not so much about soil fertility. It does help ‘condition’ the soil too.

However, with the advent of herbicides which kill most weeds and leave the corn alone (Atrizine was the first really effective one, introduced to widespread use in the late 60’s) rotation suddenly wasn’t as important as before. Today’s herbicide leave the fields with nary a weed, only the crop.

Next came a wider variety of insecticides, and, as this article suggests, they are a lot tougher to be effective.

For example, it’s important not to have the various little critters attack the crop until harvest, then, suddenly you want them to attack the stalks with a vengeance, break them down and turn them into organic matter as quickly as possible. So timing is everything.

A crop growing system called ‘no-till’ began in the 70’s that took advantage of the new herbicides and insecticides. Basically the new crop was just planted in the exact same location as the old one without any major tilling begin done. Using this system the soil is left undisturbed for years at a time.

Lately this has fallen a little by the wayside as the newer high yielding crops produce so much residue that is need to be covered over by plowing it under.

Fertilizer has also progressed far, far beyond the simple NPK of the 50’s and 60’s. Now in addition to the basic Nitrogen, Phosphorous, and Potash, all sorts of micro nutrients are applied, some with timed release, some at different times when they are the most effective. The fertilizer business is focused on improving the soil each year, a making it a little better than in the last season. Like all other aspects, they’ve been very successful, and today we have some of the most fertile soil this country has ever seen.

Seed also has come a long ways. Even though farmers can still grow their own seed, I doubt but a dozen or two all across the country do so. That is because of simple economics, it makes the farmer much more money to buy commercially grown seed, which produce 10 to 20 times as great a yield as home grown seed, much more consistently, and of mush higher quality.

And it isn’t just Monsanto producing these seeds, there are hundreds of seed corn companies vying for the farmers business, each claiming their own proprietary seed can make more money for the farmer than anyone else. All this talk about Monsanto this and Monsanto that just comes from uninformed people who visit Leftists sites and believe their lies. It also comes from (I suspect) FR trolls whose goal is to damage the farming industry. Monsanto may be one of the biggest, but they have a lot of very fierce competition.

Add in modern GPS and data technology which break large hundreds of acres fields into small plots of a small fraction of an acre, combine in machinery which can dispense seed, herbicide, insecticide and specific tillage machine adjustments ‘on the fly’ and what results is a field with tens of thousands of very specific seed populations, insecticides and fertilizers needed for each tiny plot, dispensed in the most efficient method possible. This all happens with very wide machines traveling at 5 mph or better making hundreds of adjustment every minute.

The result has been an increase in yields nearly undreamed of only 30 or 40 years ago. By way of example, in 1966 I had a test plot test different corn seeds against each other. The best did 90 some bushels per acre.

My friend farms that land now, using most of the methods I just outlined. He regularly gets over 200 bushes per acre on that same ground, Better seed, better fertilizer, better tillage all contribute to this bonanza. BTW, my grandfather raised about 30 bushels per acre on that ground, using his home grown seed. We are crossing the threshold even as you read this to turn that 200 bushels per acre into 300. Amazing, amazing times we live in.

The farmer is better of for this, but the big winners are the consumers, food prices (as a percent of disposable income) have fallen 30% during the last 40 years.

Sorry for the long answer, but all this hand wringing nonsense (not by you) irritates me, misleads the average consumer, and generally is destructive to an amazing food producing system. Don’t listen to them.