An influence of organic matter on the bulk density in soils
1997
Kask, R.
The bulk density of the organogenic (in situ) horizon A sub(org) of an unarable soil increases from top down. The bulk density difference between the upper and lower layers of the horizon A sub(org) is 1,2-3 times, being higher in half-hydromorphic soils. Beginning from the mineral horizon soil the bulk density increases abruptly. There is a close correlation between the organic matter content (C sub(org)) and bulk density in the A sub(org) horizon of the unarable soil. This allows the bulk density to be estimated (with sufficient precision for practical purposes) on the basis of the organic matter (C sub(org)) by using a regression equation as it has been done in the present study. To determine the total soil mass of A sub(org) horizon in the unarable soil (for more detailed research) it is preferable to calculate it as a sum of the mass of different layers (the regression between the organic matter content and bulk density is not linear). Natural soil development decreases the bulk density in the unarable soils because of an increase in the organic matter cotnent and reserve. In an arable soil teh bulk density is increased in connection with its becoming more mineralized, with the technological pressure on the soil and the inclusion of the soil poor in humus under a ploughing layer in a cultivable layer
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