How to Determine the Weight of a Clarity Sample

How to Determine the Weight of a Clarity Sample

Seed clarity analysis is a very important step in the test of seed quality. Clarity analysis refers to the percentage of the total weight (including impurities other than normal seeds) of normal seeds in a certain amount of seeds. If the degree of clarity is 100%, it means that the batch of seeds are pure seeds with no impurities. However, in general, this situation is relatively small, usually the degree of clarity is at least 95% or more, or even 98% or more. In addition, seed quality also includes seed purity, seed weight, seed water content, and seed germination rate. In the analysis of seed clarity, it is necessary to rely on scientific instruments, such as seed blowers, which are frequently used instruments for the analysis of seed clarity. This instrument is also sometimes referred to as a seed air sorter. Seed winnower distinguishes pure seeds, impurities, and other plant seeds using the floating velocity of particles in the air. In addition, the seed counting instrument is professionally used for the determination of 1000-grain weight of seeds, and the vacuum counting seeding instrument is used for seed germination experiments.

In the process of seed clarity analysis, we usually need to determine the weight of the samples submitted. Our test sample is the sample sent to the laboratory, and the clarity test sample is the sample used for the test item. The minimum weight of the two samples shall be in accordance with the provisions of the GB/T3543.2-1995 standard in the "Regulations for Inspection of Crop Seeds" (hereinafter referred to as the "Regulations"). It should be noted that the weight of the test samples and the cleanliness test samples specified in the "Regulations" are the minimum weight and cannot be lower than this weight. If the test sample weight does not meet the required weight, it shall be filled or re-weighed. Comparing the weights of the test samples and the cleanliness test samples in the “Procedure”, it can be seen that the difference between them is very large, generally more than 10 times. The reasons are: (1) The sample size is too small, the sample is inaccurate, and the representativeness is not strong. (2) There must be sufficient samples to meet the detection of other items, such as germination tests; (3) sometimes need to do a second test, such as excess error; (4) "Procedure" provides for the determination of the number of other plant seeds The amount of sample required is large; (5) A certain number of seeds need to be separated from the test sample and kept for a growing season for review. In addition, the "Regulations" also mention that if the determination of the number of other plant seeds is not carried out, the sample submitted shall at least meet the weight of the test sample specified in the "Clarity Analysis" of the "Regulations" and be described on the result report form.