Best Soil for Cucumbers: http://www.ces.ncsu.edu/depts/hort/hil/hil-8014-b.html
Best Soil for Strawberries: http://www.ces.ncsu.edu/depts/hort/hil/hil-8205.html
Best Soil for Tomatoes: http://www.ces.ncsu.edu/depts/hort/hil/hil-8107.html
Best Soil for Watermelon: http://www.hffinc.com/Watermelon.htm