Seed clarity refers to the percentage of the weight of normal seeds in a given amount of seeds (including impurities other than normal seeds). A 100% clarity indicates that the seed has no impurities. Clarity is calculated by: Seed clarity = (total seed weight - impurity weight) / total seed weight × 100%, and the impact of seed clarity on yield is less than purity. "Seed clarity" is one of the main indicators to measure the quality of seeds, and it is based on the procedures and methods stipulated in GB/T3543.3-1995 People's Republic of China National Standard "Agricultural Crop Inspection Operational Rules and Clarity Analysis".
The seed clarity can determine the weight percentage of each component in the sample of the test seed and identify the mixture characteristics of the sample. According to the relevant instructions in the "Guidelines for the Implementation of Crop Seed Inspection Practices", we can understand that the seed clarity includes two aspects: 1. Determine the weight percentage of each component in the inspection sample, and infer the composition of the seed batch accordingly. GB/T 3543.3-1995 provides that the test samples are divided into three components: net seeds, other plant seeds, and impurities. The results for each component are expressed as percentages by weight. 2. Identify the species to which other plant seeds and impurities in the sample belong. Clarity analysis not only calculates the weight percentage of each component, but also speculates the composition of the seed lot and also analyzes the characteristics of the sample mixture. Because the sediment and florets in the mixture are worthless, they are harmless. If weed seeds are harmless, they must be identified one by one.
There are related supporting instruments for the analysis of seed clarity, such as seed cleanness table, seed blower, and several kinds of vacuum bed setters. The wind classifier is also called the seed classifier. It is mainly used as a laboratory test instrument to classify samples according to the aerodynamic behavior (floating speed) of the particles in the airstream. The seed blower can divide the seed into two parts: the impurity part (collected in the top impurity chamber), and the seed part (collected in the sample box). Seed hair dryers are suitable for all kinds of cereals, vegetable seeds, flower seeds, herbs and tobacco seeds. Several types of vacuum set-up instruments are used specifically for seeding, seeding and seeding in seed germination tests. Mainly by the body, straw, suction head composed of three parts. After the analysis of this set of seed testing instruments, the seed's netity has been improved to meet the relevant standards for domestic seed testing. However, compared with some international standards, our country has not done enough to meet the relevant standards for seeds. In the seed lot, quarantine objects such as poisonous wheat, barnyardgrass, lee and field weeds, or vicious weeds are often present, causing great losses to agricultural life. With the progress of society and our increasingly extensive exchanges with the international community, it is necessary for relevant departments in the country to revise the existing seed quality standards as soon as possible, and improve the net degree as soon as possible, so that it can be compared with the Crop Seed Inspection Regulations and Clarity Analysis. "Completely docking, putting a good seed inspection standard for the healthy development of agricultural production."
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