Small tomatoes -- What's up?

[tibobyt]

For two years now my tomatoes have been coming in very small compared to years past. The only thing I'm doing differently is watering them at their base with a wand once a week rather than have the sprinklers spray them every third day. There are plenty of amendments in the soil and I fertilize every few weeks. It gets around 90 degrees in my garden each day and we get lots of sun. Might I not be giving them enough water? Any ideas?

[greg draiss]

are they planted in the same place every year?
any diffrence in sunlight or shadows cast by trees
deep watering is far superior than frequent overhead watering

[tibobyt]

They are planted in the same area each year, but I add a whole lot of amendments prior to planting in April. I may not be giving them enough water each week. They get plenty of sun from morning until evening. It gets quite hot in the garden area -- around 85 to 90 degrees on most days.

[Digthedirt]

I read that we should snip out the suckers in order to get larger tomatoes. The article says if we leave the suckers we get more but smaller tomatoes.