Soil structure helps to increase water and nutrient retention for sustainable cropping system. The spade test is a cheap and reliable on-field method to assess the soil resistance using a rod driven vertically into the ground and identify potential areas of compaction.A steel tube with a conical tip is driven into the ground recording the soil resistance. The higher the resistance of the soil and the more difficult it is to push the rods in, the better the soil quality, the more stable it is or the higher the bearing capacity. Based on the results of the penetrometer test and taking into account the geological data available for the soil studied, it is possible to deduce the composition of the soil. It is necessary to measure the soil moisture profile in order to interpret the curves, as this test is very sensitive to soil moisture. This is an indirect measure of soil structure that can complement other indicators such as the spade test. It can be used to identify a structural problem, to assess the depth of compaction, and to reason intervention according to the problem identified and the following crop. Other factors can influence resistance, in particular soil moisture.
Soil Physic Fertility Test: Penetrometer Test
Content Author: Arvalis