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Pelletized gypsum will solve the problem of burning. It will lock up the available nitrogen and stop burning. It is also a good soil amendment. A preventative sprinkle prior to placing the tractor in more sensitive areas might be a good idea. Our chickens run throughout our large turf areas will little if any impact, but they are not concentrated as with a tractor. Moving regularly, would seem to be a very good idea, and provide more food and insects for them to eat. Or so it seems.
We have never had an issue with top dressing the garden, you just have to leave enough space around the stalk of the plant, and leave the poop and shavings mixed up together. The breakdown of the pine shavings uses nitrogen from the poop. If lightly placed as a dressing, directly on the ground and not the plants themselves, and allowed to water in, nitrogen burn has not occurred. We also don't put it on the ground where there is any possibility of fruit touching the compost, thus the 12" (max) rule of plant growth. By the time any fruit is ready, the compost has broken down for 60 to 90 days. We don't top dress things like lettuce. We plant in late april, early may and harvest around late July. We also lightly top dress throughout the year with grass clippings, and straw to encourage the worms to come up and have lunch.
Just how we do it though, my mother has been gardening this way for years, and so we do too.