Total pore-space estimation in freshly ploughed soil.
AbstractA method is described for measuring the height of the soil surface at different times relative to level marks under the ploughed layer. These heights can be used to calculate pore space immediately after plowing from its value determined before plowing & the plowing depth. The height of the surface soil is measured with a relief meter which is shown in a photograph. It consists of a vertical scale 10 cm high, divided into cm & fitted in an aluminium frame. In front of the scale 20 needles are placed 10 cm apart & held in position by a spring-mounted bar. If the bar is pushed in, the needles slide down until they touch the soil surface. Experiments show that spring cultivations compact the soil; frost raises the height of the surface soil, but has little effect on surface roughness. (Abstract retrieved from CAB Abstracts by CABIâ€™s permission)