Seed germination requires certain conditions such as moisture, temperature, oxygen, etc. Different seeds or different varieties of the same crop have different requirements for external conditions when they germinate, according to the standard test specified in GB/T3543.4-1995 Crop Inspection Regulations, The seed germination rate of most seeds is consistent with that of field planting, but after several years of practical operation by experts, corn, rice, peanuts, and soybean seeds were placed in intelligent seed germination chambers to regulate different growth environments. In special circumstances, different moisture standards are needed to obtain the correct germination results. Water requirements for maize seed germination The corn seeds that have been popularized in recent years are divided into hard grain, silty and sweet types. Hard seeds, according to the provisions of the regulations use sand bed, add water to 60% of its saturated moisture content, temperature 20 ~ 30 °C, 5 ~ 6d will be able to achieve the germination rate count standard; and for silty, sweet type Some varieties, such as Shendan 7, Dan 2100, and Super Sweet 2000, due to their weak buds and slow germination, the final shoot count needs 9 to 10 days. These seeds are more stringent in terms of water requirement, with slightly higher moisture in the middle and later stages, and germs and molds are more likely to occur. Therefore, it is best to use a sand bed for seed germination of this type. When the seeds are placed, keep a certain distance. The water content of the sand bed in the first 2 days should be controlled at 60% to 65%. After the seed has absorbed enough water, the sand will be within 3 to 5 days. The moisture content of the bed should be controlled at about 55%, and later should be controlled at 45% to 50%. If it is found to be rot and moldy, remove it in a timely manner and pay attention to ventilation and ventilation. For late-maturing corn and sorghum varieties in the north of China, due to the relatively large internal moisture content of the seeds at the time of harvest, the temperature at that time was low, and it was difficult to use natural air-drying methods. Drying methods were generally adopted and such methods were also very good. Rice seed germination requires moisture The rice has a layer of appendages that hinders the entry of water and the water absorption process is longer. If the temperature is maintained at 28°C, soaking the seed requires 24 to 28 hours. No seeds are soaked in a sand bed or a paper bed to attract enough water to the seeds. First, the seeds have a longer duration, and the germination time is 14 days or longer. In the case of high temperature and high humidity, the seeds are susceptible to infection by fungi and molds to reduce the germination rate. The second reason is that uneven absorption and insufficient water absorption also affect the germination rate. In 2006, we entered a batch of rice varieties to open line 7, according to GB/T3543.4-1995 standard using TP bed. Water requirements for germination of peanut seeds Since peanut seeds have high protein content, rapid water absorption and rapid germination, most germination can be completed within 6 days. Some varieties also germinate according to GB/T 3543.4-1995 standard, and the duration is longer. It is long and there are fresh and ungerminated seeds that do not normally reflect the germination rate of the seeds. For a small variety of pearl bean peanuts, germination experiments were carried out. The seeds were soaked in a sand bed for germination and 4 replicates. After 6 days, there were 24 fresh and non-germinating seeds per 100 seeds. After cutting these non-germinating seeds, it was found that 8 seeds did not absorb water at all and 16 seeds only absorbed a small amount of water and did not reach the seed germination. The required moisture standard. Soybean Seed Germination Requirements for Moisture Soybean seed coat is thin, embryos are larger, and hygroscopicity is strong, which leads to higher moisture requirements when the seeds germinate. Slightly higher temperature and humidity will make the soybeans easily moldy. For soybean varieties with higher water content, special attention should be paid to the control of moisture during germination experiments. When setting up the bed, the sprouting bed must always be kept moist. At the same time, water should not be too much, and the moisture content of the bud bed is 5%~8% lower than the normal germination requirement. Seeds should be evenly distributed on the germination bed. The spacing between the seeds should be 4 to 5 times that of the seeds themselves to prevent mutual infection of moldy seeds. If mold growth is found, it should be promptly removed and washed. Some soybean seeds have a very thin seed coat. After the seeds absorb enough water, the two cotyledons are easily detached from the seed coat. When doing this kind of germination experiment, try to move as little as possible. If you need to move, take it gently. Excessive force. Conclusion: Through the above experiments, it is easy to see that moisture is the key factor for seed germination. The seed must absorb enough water to activate the enzymes and phytohormones in the seeds, promote the conversion of stored substances, strengthen the respiration, and promote seed germination. . Different crops or different varieties of the same crop have different water requirements. Some seeds are more sensitive to moisture, and too much water will cause their germination to be weak, sometimes they may not even germinate, and some seeds are less sensitive to moisture requirements. The seed germination experiment varies from crop to crop and from variety to crop. According to the characteristics of different varieties of different crops, the amount of water added to the germination bed will be determined. This will help to ensure that the seed germination rate is maximized and accurate germination results are obtained. For special varieties, such as supersweet corn, pearl bean peanuts, etc., the characteristics of the seeds of the variety must be taken into consideration. When the germination test is performed, the water supply or treatment measures are adjusted properly to obtain the correct test results. Rubber Machinery,Rubber Machine,Carbon Fiber Machine Fenghua Jade Motor Co., Ltd. , http://www.sole-injection-molding-machine.com