Even if a soil test of your garden showed an adequate amount of Nitrogen (N) to start the season, more nitrogen is often necessary at this time of year to ensure your garden produces abundantly.
When sweet corn has 8 to 10 leaves, fertilize.
When tomatoes are the size of golf balls, fertilize; for cherry tomatoes fertilize when the fruit are the size of a dime.
When your squash, cukes and other vine crops begin to vine, fertilize. If you have bush varieties of these vegetables, be sure to fertilize them when your vining crops start to vine.
Avoid the tendency to over fertilize.
For the specifics check out http://www.coopext.colostate.edu/TRA/PLANTS/Vegetable_Gardening_Nitrogen_Recommendations.pdf
Remember: Always apply fertilizer to moist soil.
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