"The best fertilizer is a farmer's footsteps", but your careful attention is needed well ahead of soil prep, planting or even ordering seeds. Here is a crop planning spreadsheet that many growers have found helpful. You'll find two files -- one that has first-succession planting dates for winter hoophouse production in lower Michigan, and the other that is filled in with plant-dates, spacing, and varieties for a whole year's field production. Take what you want, tear it apart, make it better, and give it away again. Knowledge is free. Let us know if you'd like to talk through the process of making this tool useful for your farm.