take the soil in 12 square inch pot then weigh it and calculate......by tonnes per hectare conversion
If you are working in a field, the application is on an area basis. so work out the plot size . 20 tones per hectare is a weight per area.
You must consider your plot area (or pot area,) rather than the weight of soil. So work out the plot area (length by width ) or the pot area of the pot (typically a circular pot ) so you calculate the (area of a circle) at soil height in the pot.
It will be easier to calculate the area of square or rectangular pot. You can weigh the soil and calculate
It depends on the depth your soil (or, at least, the depth that interest you for our study : the ploughing depth? The depth explored by the roots?). Once you answered that question, it is just a simple calculation to make using the soil density (approximately 1,3 for a sandy soil and up to 1,5 for a clay soil).
Hi Summera Jahan
You need to know the depth to which the compost will be incorporated and the bulk density of the soil. A sample calculation assuming that the compost is mixed into the soil to 0.1 m depth and the bulk density of the soil is 1.3 t/m^3.
Compost application rate 20 t/ha
Depth mixed 0.1 m
Area of 1 Ha 10000 m2
Soil Volume 1000 m3/ha
Soil density 1.3 t/m3
Weight of soil 1300 tonnes/ha
Ratio Compost:Soil 20t/1300t
20000kg/1300000kg
Ratio equals 0.015384615 kg Compost / kg soil
0.153846154 kg Compost /10 kg soil
Hope that helps
Cheers David Hall
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