Rice is an important field grain crop in China, with a wide planting area. In the process of rice cultivation, seed selection is a very important stage. How to identify the quality of rice seeds?

1. Check the purity of rice seeds

The purity of rice seeds is an important indicator for measuring the quality of rice seeds. The purity of conventional rice seeds cannot be lower than 98%, and the purity of hybrid rice seeds cannot be lower than 96%.

2. Check the cleanliness of the seeds

High quality rice seeds generally undergo multiple processes of air selection and screening, with impurities such as empty grains, soil, and sand controlled between 1.5-2.5%. If the impurity content exceeds 5%, it is considered inferior seeds. If the seeds are visually free of soil or sand particles, or if they are inserted into a seed pile or seed bag by hand, and there is no dust or other impurities on the fingertips or back of the hand when pulled out, the cleanliness of the seeds is usually around 97%.

3. Check the moisture content

The national standard for the moisture content of high-quality rice varieties is no more than 13% for indica rice and no more than 14.5% for japonica rice. Checking the moisture content of seeds is usually done by biting with teeth and rubbing with fingers. Take a grain of rice and bite it with your teeth. The sound is crisp and clear, with a smooth cross-section and a qualified moisture content.

At the same time, the CSY series moisture analyzer of Shenfen Instrument can also be used to accurately quantify the moisture content of rice. The moisture analyzer can be widely used in all industries that require rapid moisture measurement, such as grain, feed, seeds, rapeseed, dehydrated vegetables, tobacco, chemical industry, tea, food, meat, and textile industries. It meets the requirements for moisture measurement in laboratories and production processes in agriculture, forestry, papermaking, rubber, plastic, textile and other industries; Simultaneously meet the determination of moisture content in solids, particles, powders, gels, and liquids.

4. Inquire about germination rate

The national standard for germination rate of rice seeds is that conventional rice should not be less than 85%, and hybrid rice should not be less than 80%, otherwise it is considered inferior.

5. Observe the embryo

High quality rice seeds have a smooth and glossy appearance, with full and plump embryo. When rubbed and twisted by hand, the embryo feels moist and has a green color. Poor quality rice seeds have withered embryos and a darker color.

6. Identify new and old seeds

Seeds with bright skin color, yellow shell, full and plump embryo, and moist green color when digging the embryo, are considered as new species with high vitality; On the contrary, if the seed coat has a dull color and is dark brown and dry, these seeds are of weak vitality. In all new species, there are no insect infested empty shells, insect droppings (insect powder), or insect coatings, while in old species, there are a large number of signs of husks, insect infested broken grains, and insect coatings, and the proportion of old species is lower than that of new species.

At the same time, the CSY-SLX8 Grain Freshness Tester can also be used to quantitatively and accurately detect the fatty acid value content of aged grains in rice seeds, targeting seeds that are difficult to distinguish without obvious appearance and odor characteristics. The CSY-SLX8 Grain Freshness Tester can quickly detect the total freshness (aged grain) in grains and other crops.

7. Observe the lesion

The outer shell of rice seeds is black brown or has irregular hemp spots and lumps, all of which are seeds infected with diseases. If there are black brown patches on the surface of seeds infected with rice blast disease, while there are no symptoms on the surface of the seeds.

Seed damage can accelerate oxidation and cause corresponding mold growth. At the same time, it may also be caused by the growth of fungal toxins. Therefore, when there is suspicion of seed disease and mold, the CSY-YG701 fungal toxin rapid analyzer can be used to quickly and quantitatively detect T2 toxins, vomitoxin, ochratoxin, fumarate toxin, zearalenone in food such as grains, feed, grains, edible oil, seasonings, etc. The fungal toxin rapid analyzer is suitable for grain and oil monitoring centers, grain and oil feed production and processing, food processing and trade, self inspection of livestock and poultry farmers, and rapid market screening by industrial and commercial quality supervision departments.

In summary, by combining physical judgment methods such as appearance, odor, and hand feel with advanced detection instruments for quantitative and accurate detection, it is possible to more effectively and scientifically identify the quality of rice seeds, maintain the good quality of grain raw materials, and ensure food safety.