To identify the quality of carbonized rice husk, you can consider the following aspects:

1. Appearance observation: Check the appearance of carbonized rice husk samples. High-quality carbonized rice husks are usually black or dark gray, granular, and will not be balled up or sandy.

2. Density test: measure the density of carbonized rice husk. Higher density generally indicates better quality carbonized rice husk. Density can be calculated by weighing a known volume of sample, or by using some specialized density testing equipment.

3. Loss on ignition rate test: Heat the carbonized rice husk sample to a high temperature and measure its mass loss during the heating process. A lower loss on ignition rate generally indicates better quality carbonized rice husk, as it means there are fewer impurities and volatile materials in the sample.

4. Functional test: Carry out corresponding functional test according to the use of carbonized rice husk. For example, if it is used for activated carbon preparation, its adsorption performance can be tested; if it is used for soil improvement, its water retention and aeration properties can be tested. These functional tests can evaluate the practical application value of carbonized rice husk.