Well, I can't speak specifically for the late parts of the 30s but many New Deal policies (initially) limited and closely controlled crop production. The reason for the agricultural collapse in the Great Plains were (generally speaking) as we all know a depletion of soil which lead to adverse effects on crop output. However another reason for agricultural collapse was because preceding the depression, many American farms were actually producing not just adequate but excessive outputs. Long story short, crop supply rose as demand remained stagnant and as we all know this would lead to a fall in crop values. As a result farmers were pulling in lesser and lesser revenue despite producing healthy and in some cases increasing amounts of produce. New Deal policies actually provided subsidies to farmers to burn and destroy their crops and kill off their livestock en masse. By carefully monitoring and controlling agricultural supply, they also helped restabalize its value. It's unlikely the government would provide subsidies to start up new farms however I'm not familiar with a specific case of the government discouraging farm creation. Look into the Public Works Administration (PWA) they provided jobs to millions of Americans through construction of new public buildings and administering grants to private groups and states to initiate their own public works projects. They also helped to construct many affordable housing projects for the working class (urban slums were seen as a major problem at the time). In regards to unionization, the Wagner Act was implemented in 1935 and was the first federal protection of workers' rights (most notably the protection of workers' rights to assemble without harassment and reproach from employers and also to collectively bargain with their employers as opposed to individually seeking the best deals for themselves which is counterproductive to the betterment of the whole of the workers). I hope this answers your question somewhat.