The overall increase in acres in vegetables is significant. Moving from $3,698.744 in 2002 to $4,682,588 in 2007
Number of farm grew from 54,391 in 2002 to 69,172 in 2007

The number of vegetable farms and number of acres per farm at
small scale (less then 5 acres) skyrocketed.

The number of less then one acre farms grow from 7,550 in 2002 to 13,426 farms in 2007
The 1- 4.9 acre size grow from 18,692 farms to 27,752 farms.

From 5 -15 acres farms and acres grew

Medium scale (15-249 acres) farms and acres per farm declined significantly.
 
Large scale (250 -5,000 acres) number of farms and acres per farm grew significantly

Despite the large gains in number and acreage of small vegetable farms, the total percentage of acreage in vegetable production on less then 15 acre farms fell from 34% in 2002 to 32% ini 2007.

The index to all tables is here:
http://www.agcensus.usda.gov/Publications/2007/Full_Report/Volume_1,_Chapter_1_US/index.asp