weather crops later in the season.   In other areas that grow say peas, plant beans or carrots after the peas mature.  In the fall when the peppers and other warm weather crops are done, plant more cold weather greens.

I like to add manure before each planting.  This helps keep the soil fertile.  Also weed carefully and do not turn the area over to a depth greater than 2" or you will bring up new weed seeds from underneath the soil.