1. Mold: During storage, if the moisture content of the seeds is too high and the respiration process is vigorous, a large amount of respiratory heat and moisture will be generated, which will cause the seeds to heat up and mold (such as locally sown summer seeds and Northeast seeds with high moisture content, which will cause mold in Shandong from June to over 14%).

2. Drug damage: Seeds with high water content have strong respiration, and excessive inhalation of drugs during fumigation can cause drug damage, thereby reducing vitality. (The stored seeds must be sun dried before being smoked in the summer warehouse.).

3. Freezing damage: High moisture seeds are prone to freezing damage, which reduces germination rate. (Freezing damage occurs when the embryo separates from the endosperm and the embryo turns black: 20% moisture should not be frozen at -2 ℃; 18% should not be frozen at -5 ℃; 17% should not be frozen at -8 ℃).

Therefore, the moisture content of seeds must be measured before processing, packaging, fumigation, and storage. Seeds that do not meet the safety moisture standards are never allowed to be stored.

There are many methods for determining seed moisture, which can be summarized as standard determination method and other determination methods. Standard determination method: drying weight reduction method, used for formal inspection report. Other methods include rapid method, titration method, and distillation method. Among them, the fast method is to use electronic instruments (such as capacitive and resistive)Grain moisture tester）.