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Then, a top layer of organic mulch is applied. More elaborate sheet mulching involves more layers. Sheet mulching is used to transform a variety of surfaces into a fertile soil that can be planted. Sheet mulching can be applied to a lawn, a dirt lot full of perennial weeds, an area with poor soil, or even pavement or a rooftop. [3]
The effect of mulch upon soil moisture content is complex. Mulch forms a layer between the soil and the atmosphere reducing evaporation. [11] However, mulch can also prevent water from reaching the soil by absorbing or blocking water from light rains and overly thick layers of mulch can reduce oxygen in the soil. [12]
At worst, it leads to soil contamination (see Environmental Impact and Safety Testing) Some recycled varieties may leach chemicals (some toxic) which are harmful to plants [3] [4] [5] Rubber mulch is a particular hazard if ignited because of the resulting fumes that resemble those produced in tire fires.
The addition of mulch helps to make the soil more porous. [10] Adding manure and compost can help boost the amount of organic material present in the soil, which in turn helps add essential nutrients. Specifically, adding a 2- to 3-inch layer of compost and manure should be mixed into the soil to match a shovel's depth. [11]
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Soil loses nutrients, like nitrogen and fertilizer, and its ability to store water. [17] [note 2] Decreases the water infiltration rate of soil. (Results in more runoff and erosion [17] [19] as the soil absorbs water more slowly than before) [note 3] Tilling the soil results in dislodging the cohesiveness of the soil particles, thereby inducing ...
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