hi! i'm new to raising chickens and really excited about it. i just got 3 hens of egg-laying age. but unfortunately my dad applied synthetic fertilizer (those turf builder pellet things) and pesticide all over the lawn yesterday (even though i told him not to. grrrrr). how long do i have to wait to let the chickens roam free on the lawn and eat the grass and weeds? what happens to the chemicals in the fertilizer pellets? are they absorbed by the grass, but also remain in the soil? how long do the chemicals stay in the soil? even if the fertilizer pellets have all been absorbed by the grass and soil, is it still bad for the chickens to eat the grass that absorbed the fertilizer chemicals? i mean are those chemicals in the grass? so i guess i would have to wait a couple of years for the fertilizer to be completely gone from the grass and soil? if i don't want to wait years for the chemicals to disappear, should i get rid of all the grass, add new soil over the existing soil, and sow new grass? thanks!