Seed clarity analysis is one of the four foundations of seed quality identification. The other three points include 1000-seed weight, seed germination rate, and seed moisture content. With the accelerating international process, many international testing standards have flooded into China, which has also had a significant impact on the detection of seed quality in China. At the same time as the quality of domestic seeds has risen, there have been a large number of seed testing instruments, such as seed cleanliness worktables, seed germination boxes, seed counting instruments, and several vacuum bed setting devices. These instruments are now widely used in various universities, seed stations and other places to achieve rapid identification of seed quality.
Seed clarity analysis means that the seed sample to be examined is divided into three components: net seed, other plant seeds, and impurities, and then calculated in the total mass, the weight of normal seeds is the total weight (contains impurities other than normal seeds). percentage. The formula is: Seed clarity = (total seed weight - impurity weight) / total seed weight × 100%. Of course, the simplest is to use the seed clarity tester to analyze the clarity of the seeds, and the analysis results are more accurate. So how to distinguish net seeds? There are three rules below. (1) Immature, thin, wrinkled, diseased, or budded whole seed units that can identify the species they belong to should be treated as net seed; (2) Broken seed units are larger than the original Half of the size, regardless of whether or not there are embryos are net seeds; (3) In addition to the above basic principles, the specific division of the seeds of each species or genera should refer to the detailed rules for the division of net seeds, treated differently.
In addition, we should also pay attention to the following when analyzing the clarity: 1. The following points should be taken when dispensing the sample: The sample should be thoroughly mixed and then sampled. Two samples or two and a half samples were taken from the two parts of the test sample, which were divided into two parts, to avoid continuous sampling in the 1/2 part. 2. The role of screening is to initially separate the sample and increase the efficiency of the analysis, but never consider the results of the screening as if all three components have been separated. The principle of sieve selection is to separate the ingredients so that they can be separated and separated to the maximum extent possible. 3. Clarity analysis depends on the weight of the sample to determine the number of decimal places retained during weighing, so one ten-thousandths of an electronic balance must be used. Never use a tray balance or a low-precision balance.
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