The quality of tomato seeds depends mainly on seed plumpness, germination rate, germination potential and seed purity.
(1) Fullness is the fullness of the seed. It is generally expressed in thousand grains, which is the mass (grams) of 1000 seeds. The larger the grain weight, the more full the seeds are. The average tomato seed weight is about 3.1 grams.
(2) Germination rate refers to the percentage of germinable seeds in the sample seed. The germination rate of tomato seeds requires more than 90%.
(3) Germination potential refers to the percentage of germinating seeds that account for the test seeds within the specified number of days. It is a quantitative indicator of seed germination rate, uniformity and concentration of germination. The tomato seed germination potential was measured for 5 days.
(4) Seed purity refers to the percentage of the number of plants that meet the characteristics of this variety to the total number of plants identified. The purity of tomato seeds requires more than 95%. Hybrids are divided into primary and secondary species. The purity of the primary seed is not lower than 98.0%, and the secondary seed purity is not lower than 95.0%.
Rhodium powder Rh≥99.95% Properties: silver-white metal, extremely hard, wear-resistant, also has considerable ductility Application: It can be used as raw material for electrical instrumentation, chemical industry and manufacture of precision alloys. Rhodium powder is based on the widespread use of ruthenium in the industrial industry. Since rhodium is a rare metal required by the industry, the industry price is slightly higher than that of general non-ferrous metals. Rhodium, one of the rare elements, has various uses. Rhodium can be used to make hydrogenation catalysts, thermocouples, platinum-rhodium alloys, etc. It is also often plated on searchlights and reflectors, and is also used as a polishing agent for gemstones. and electrical contact parts.
precious metal
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