Ive need sum help...

ive got three food plots out its still kinda in the early season where i live and ive been hunting hard the past cuple weeks. but no results in the plots? is it a weather factor? time of year kinda thing? and does this mean that when gun season rolls along pretty soon and its still warm shuld i be hunting over the plots or over my corn and soybean fields? i rlly need sum help guys