There are many ways to choose a species. Selecting with salt water is a way of "water selection". Since the specific gravity of the seeds and the specific volume of brine are different, when the seeds are poured into an appropriate concentration of salt water, the seeds that are full and full and have a large specific gravity are submerged; the unqualified seeds such as pods and broken grains will float on account of their small specific gravity. The surface of the water, so as to select excellent seeds.
To use this method for seed selection, it is best to use a pycnometer to determine the concentration of brine. If no pycnometer is available, dissolve the dissolved brine in a bowl and put in a spoonful of seeds to be selected. If it sinks, it indicates that the salt water is too light and you should continue to add salt; if most of the seeds are floating on the water, The brine is too concentrated and should be diluted with water until most of the seed is inclined to the bottom of the bowl. In addition, it should be noted that when salt water is continuously used many times, salt will be taken away by the seeds, and salt should be added in time to prevent the decrease of the concentration and affect the quality of seed selection.
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