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cent. This figure is obtained by the following calculation: 134 cu. yd. sawdust x 300 lb. per cu. yd. equals 40,200 lb. dry organic matter divided by 2,000,000 lb., the weight of the plow layer of a silt loam soil. If softwood sawdustjs used a one-inch layer will increase the organic matter content of the plow layer about 1-4 per cent
Organic matter starts to decompose as soon as it is incorporated with the soil. The rate of decomposition depends on the succulence of the material as well as on the temperature, moisture content and aeration of the soil. No figures are available which can be used to estimate the speed of breakdown of sawdust under various climatic conditions. It is, however, a relatively stable type of organic matter which decomposes more slowly than most cover crops or crop residues. If sawdust is not available, fine shavings or wood chips may be employed effectively as a mulch. Other organic materials such as peanut hulls, ground corn cobs, peat moss, or straw may also be used if available at an economical price. Straw is less easy to handle than some of the other
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