Did the Soviet Union investigate greenhouses in the early 1920's?

These days many people considered themselves as people of future. And the future way of feeding people was seen in mass growing of chlorella in ponds and lakes - to make a huge soup bowls for the whole towns or cities - they preferred collectivismus in everything. Yes, greenhouses and hydroponics were also considered as methods of future, but not for long. They didn't really start in practice and the harsh reality of collectivization soon destroyed all these enthusiasts and their ideas.

As for alternate ways of food growing, the most interesting way was seriously considered in the end of USSR existence. I was myself (in ~1985) on the conference for the alternative methods in industry and agriculture, and one of the main themes there was...

People, you will not believe, but it really WAS so! And the conference was not at 1st of April. Every piece of text here withou quotes is was the pure reality. The USSR had great problems with food, and they opened The Food Program... And there were anecdotes:

' Two skeletons are meeting:
- Where had you died? As for me, I had died before The Food Program.
- And I am yet alive
'

So, returning to the theme, they seriously considered the ways how to make a human being to absorb Nitrogen from the air. There were projects about use of some bacterias. Or special air filters. And there was a project - a serious, state project, on which many scientists worked - that declared, that if you won't eat any external proteins, your organism will start to obtain nitrogen by itself. The problem was not to let the organism die of hunger before it starts that process. And they already experimented on people - on themselves - they were good enthusiasts. They even had some positive results - as they declared - and their organisms got more protein that they accepted from the food and drink...

Orwell had very poor fantasy!

Actually, much earlier then that

According to this site (in Russian) history of greenhouses in Russia started much earlier, in the time of Peter the Great. He founded Apothecaries Garden (also known as Apothecaries Town), first botanical garden in Russia which stands to this day. Among other things this garden produced tropical fruits (like oranges) which were served at the court and later at the tables of prominent nobles. Of course, all these exotic plants would not grow in harsh Russian climate without heating, and to get the required sunshine roof and walls were made of glass.

By the late 19th century production of glass was sufficient so even wealthier peasants had their own greenhouses. During and immediately after October Revolution greenhouse planting took a hit in ensuing chaos. Many greenhouses were destroyed (property of hated kulaks ), even Apothecaries Garden was damaged. However, principles of greenhouse planting were known, so let's say somewhere from 1930's there was a revival, this time under government control.

Now about your main question about hunger - greenhouses are essentially source of supplemental food like vegetables and fruit. Main food source was always grain, especially wheat. This of course has nothing to do with greenhouses, but Soviet agricultural policies (deliberately or trough incompetence) created shortages and thus hunger. Greenhouses require lot of infrastructure and investment, something that could not be done easily in impoverished USSR. Therefore, Soviet Union proceeded with them relatively slowly, in pair with electrification and gasification required for heating. It could be argued that without devastation caused by communist policies hunger in USSR would be at much lower levels, and greenhouses would certainly help, but they were never main source of nutrients.

A greenhouse requires glass (or, these days, plastic). This is fairly expensive, especially 90 years ago, especially in Russia. They make sense when land is scarce and any measure to improve its productivity pays.

This was not the case in Russia.

Much lower hanging fruits are

1. Mechanization - attempted in the form of MTS during Collectivization
2. Chemistry - attempted by Khrushchev.

PS. Note that "successfully electrified the country in the 20's" is, to put it mildly, an exaggeration - just look at the rate of electrification in the 30ies.

PPS. I don't have a reference for discussions of greenhouses in preparation for collectivization, just like I don't have a reference for discussions of Urban agriculture.