check out this Kansas Univ. paper page 3...recommending  it for fruit trees.

http://www.hfrr.ksu.edu/doc3710.ashx

Interesting. An employee working the Lawn & Garden section of my local Home Depot recommended law fertilizer to me when I inquired about fertilizing my apple trees. The lawn fertilizer was all 6-6-6- or 10-10-10, while this article says fruit trees benefit from 27-3-3, 29-5-4, 30-3-3,  so I suppose it would work with the addition of more nitrogen.

adding ammonium nitrate to grass around apples will reduce or eliminate scab I am told.

OTOH, there are those who claim high N fertilizers reduce the fruiting of figs.  If you're going to try this it might be good to try it on a variety that you have more than 1 of.  Give 1 the high N fertilizer and another a 14-14-14 or similar.  Or even 15-30-15.  See which gives you more fruit.  Then tell us  :)

does not say about container plants...so, may burn the plants, huh?

Adding excess N will delay fruiting/flowering and reduce quality as well.

Definitely don't use the lawn fertizer for containerized plants. Also I would not apply it around the in-ground figs. Two of my figs plants that were planted in front lawn (I do fertilize the lawn), have not produced much of fruits. Lots of vegetative growth.

Navid.

For young plants that you want to grow up rapidly it is hard to beat ammonium sulfate....yes I know it seems odd to dump sulfur on figs but our water has a lot of lime in it and the plants LOVE it.  The ammonium sulfate is 21-0-0.  I don't care about figs on the young plants just want them to leap.  

I just put some Granule 10-10-10. Anywhere from a teaspoon or a bit more to a gallon to four or five teaspoons to 15gl. and anything in between.

Covered with fresh UPM and watered.

220 pots. I am beat.

Yep!!! I can vouch for what others have said from personal experience. In the last eight plus years I have given too much Nitrogen to my fig trees just as they were breaking dormancy twice. The result was lots of vegetative growth. The breba figs died. A few breba made it but very very few. With all the new growth there is usually a bumper crop of main crop figs.

On the plus side. If you want to size up your fig tree faster go ahead and push the envelope with nitrogen and give them extra water to keep the root ball moist at all times. But don't drown them. If you have never done this before you will be amazed at just how fast a fig tree can grow with proper encouragement in full sun.

Keep in mind I am talking about fig trees that have been in the ground for one season or more already. Though if you planted in early Fall you may be able to get away with it. Keep in mind this is not for trees in pots.