Soil bulk density is generally applied to the determination of total soil porosity, and is also used to estimate soil tightness and soil structure. There are many methods for determining the bulk density of soils, which are usually measured using a ring knife method, which is suitable for the determination of the bulk density of hard and brittle soil. The bulk density analyzer plays an important role in the determination of soil bulk density and is currently the main instrument for the determination of soil bulk density. WeChat sweep to get more professional information:
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Sampling points were selected at representative locations and soil profiles were excavated. According to the soil profile level, the ring knife was used to sample the middle of each layer from top to bottom. Sample 3 times per layer. If only the soil bulk density of the plough layer is measured, the soil profile may not be dug, and the soil surface of the sampling layer may be firstly sampled with a shovel. Note that the borrowing depth remains the same. Place the ring knife holder on a ring knife of known weight and press the ring knife edge down into the soil vertically until the ring knife bowl is full of soil samples. Scoop the soil around the ring knife with a spade and cut it under the ring knife. Take out the ring knife and leave the soil on both ends of the ring knife. Wipe off the soil around the knife and carefully cut off the excess soil from both ends along the edge of the ring with a knife to make the soil the same volume as the ring knife.
The determination of the bulk density tester found that the content of soil moisture directly affects the measurement results of the bulk density, so the precise measurement of soil moisture is particularly important. There are many methods for measuring soil moisture. Alcohol baking, alcohol burning and drying are commonly used. The drying method is generally adopted. The advantages of the drying method are simple and intuitive. The main instrument is an electric heating thermostatic blast drying box. The analysis step is to weigh the aluminum box containing the soil sample on the analytical balance (m,), put it in an oven preheated to (105±2)°C, bake it for 6^}8 hours, remove it, cover it, and let it dry. Cool to room temperature and weigh (mz)o
The determination of the bulk density tester requires the attention of the method to reduce the error: the balance of the weighing scale is 0.0l. According to the different measurement standards, the weighing will be exchanged accordingly; the precise control to the constant temperature prevents the temperature from being too high. The organic matter of the soil is carbonized and overflows; note that the aluminum box cover should be placed on the aluminum box and baked together when drying; the general sample should be dried for 6 hours; the soil sample with more water content and texture should be baked to 8 hours; from the oven The removed sample must be tightly closed, placed in a desiccator to cool to room temperature (approximately 30 minutes), and weighed immediately; the desiccant in the desiccator should be replaced or treated frequently. 