v Congrats! Sounds like you got a good start.
Yes, I have planted in the Spring and tilled it under in August to plant a Fall Plot. Is it a good idea? Yes as it give your whitetails better more palatable food during the summer and different palatable food in the Fall. Plant something like clovers, chicory, things high in protein in the Summer. Then in the Fall, disc under your summer plot and plant your Rape, Turnips & ,etc. these are some of the plants that deer crave more in the Fall. This gives the Deer better nutrition for a majority of the year. Is this approach easy? Nope twice the work, but sometimes you don’t have many options.
Another benefit in doing this is it conditions the deer to come to this plot / area early in the Summer and it often establishes their travel route early in the Summer when they are less stressed and pressured. So when the Fall plot comes in they are accustomed to travel this route anyways. This is a huge benefit that is often overlooked IMO.
That is one of the reasons I like to plant Beans, Turnips and Rape together in a Hunting Plot. The deer will eat the beans starting in the Summer. Then in Early August I will just broadcast by hand Rape and Turnips in the beans before a Rainfall. The Rape & turnips benefit from the natural fertilizer (Nitrogen) that is released by the beans into the soil.
Man, I’m getting excited. 
Only problem, it is way too soon! 
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