posted 12 years ago
Materials that are high in Nitrogen tend to smell when they break down, they tend to be moist, they are things that don't burn easliy and often are things that critters will eat. Green vegetable matter, fruit, coffee grounds, manure for some examples.
Your best bet for sheet mulching is to layer high nitrogen materials with high Carbon materials. Things that are high in carbon tend to burn, critters generally don't want to eat them. Cardboard, wood, paper, dried grass and leaves are some examples.