Smears are quick to decompose, but research indicates that pathogens are not completely killed and may be spread by wind, water, or insects. Covering feces with rocks may eliminate wind and insect problems, but inhibits decomposition and does not effectively separate feces from water. If at all possible, isolating feces within the soil or dirt is the best option. This effectively minimizes contamination via surface run off, wind, insects, and direct contact. Urine has little effect on vegetation or soil.
Research shows that urine poses little threat to human health.
However, urine can become an aesthetic impact due to its odor, and animals occasionally paw up ground, defoliating plants to get the salts deposited from urine. Try to urinate on rocks or sandy areas. Pack it out in doubled plastic bags to effectively confine odors. Popular forms of natural toilet paper include clean stones, smooth sticks, moss and snow. Pack them out in doubled plastic bags.