I can share my 10 years of experience. Divorce strong 
the urea solution is 1: 3 or 1: 4 (depending on which pigstock) and fill, making it around the hole around the trunk or straight into the bush.
It is not worth afraid of fear of the garden of the urea concentration, because it is quickly blurred with water and then everything grows fine there.
We had a big pear in the yard, who taught his age. We cut it with the earth itself, and then treated with such a solution. And no trouble! And if there is a root in the asphalt, we made a deepening electrode and poured this solution there.
How to defeat the pigs
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