Composting doesn't require compost bins. But bins keep compostable materials from getting too wind-blown, and too wet. Specifically, the moisture level of compostable materials needs to be on par with a wrung out sponge. Compostable materials need to be turned regularly. In fact, the more often the turning, the quicker the breakdown, the sooner the end product. It's easier to turn the layers in a bin than in a pile. And, in the case of worm composting, red wigglers prefer the confined space and the closed covers.
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Because they want to use it in their gardens.
For one thing, composting all organic matter (kitchen scraps, yard waste, manure, etc.) reduces the amount of garbage that has to go into landfills. That's the altruistic answer.
For the "what's in it for me?" answer: compost makes plants grow strong and healthy by making nutrients available to plants in a way they can easily assimilate without burning, and also regulates water so they are less likely to drown or dry out. It also helps balance the environment by encouraging the growth of earthworms and other beneficial microorganisms.
Plants grown in plenty of compost may not only look healthier and more beautiful, but they may also have more flavor and nutrition in them (if they are edible plants). A variety of micronutrients, many of which have only recently been discovered, are available to a plant from a good compost mixture. Many of these micronutrients seem to be diminishing in supermarket grown (non-organic, non-compost, chemically fertilized) plants.
No, a composting bin is not needed to compost. Composting may occur in heaps, piles or pits. Successful production of dark-colored, fresh-smelling, nutrient-rich organic matter called compost or humus requires containment of carbon- and nitrogen-rich compostables kept as hot as 131 to 170 degrees Fahrenheit (55 to 76.67 degrees Celsius) during decomposition and as moist as a wrung-out sponge, shaded with filtered sunlight at most, and turned at least weekly, be these conditions met by containers, heaps, piles or pits.
to make fresh soil for your plants and to reduce the amount of waste in land fills. also its cheaper than buying soil for your garden ever year