BANGBANG 500 is a 1L concentrate of fish, egg & blood protein that makes a total 10L final spray once added to 9L of water. It treats up to 500 young seedlings. It is repulsive to tree browsers. For an investment of around 11 cents per tree this repellent will improve your trees' chances of survival.
If you were to pre-spray your seedlings when packed in bulk before planting then the spray will go alot further.