Treatment and germination of hard-boiled seeds of Robinia pseudoacacia
1.1 Hot water soaking
Hard seeds were soaked at a starting temperature of 70 degrees, 80 degrees, 90 degrees, and 100 degrees, respectively. The effect of soaking seeds was observed at 24h, and it was found that 100 degree water soaking had better softening effect on hard solid, but it was more harmful to normal seeds; 90 degree water could soften seed coat and less damage to seeds, and the relative effect was better, but still A small part of the hard can not be inflated; 70 degrees of water on the hard seed coat softening effect, but can make non-hard seeds harmless. Because the seeds of the hedgehog are hard and non-hard and solid, it is recommended to use the method of increasing the temperature to treat the seeds, which is the best. That is to say, the inflated seeds are screened for germination by soaking with hot water at a temperature of 70 °C for 24 hours, and the non-swelled seeds are soaked with water at a temperature of 90 °C for 24 hours, the swelled seeds are selected for germination, and finally the unswelled seeds are treated with water temperature of 1OO degree. , can also get better germination results.
When soaking seeds, the volume ratio of seed to water is preferably 1:3. Pour hot water into the container holding the seeds and continue to stir to allow it to cool naturally. During the soaking process, it is necessary to change the cold water once every 12 hours.
1.2 acid etching seeds
The hard seeds were treated with 98% concentrated sulfuric acid for 3Omin, 2Omin, and 10Omin respectively. The results showed that the best effect was 20N treatment, the germination rate was over 70%, and the vigor index was higher. The germination rate was 30 minutes after the treatment, and the germination rate was the lowest after 10 minutes. Therefore, it is better to treat the hard seed with concentrated sulfuric acid for 20 minutes.
2, seed germination
At present, the "raw bean sprout" method and the layered germination method are commonly used, and the effect of the layered germination method is good. Remove the soaked seeds and mix them with 3 times wet sand (the humidity of the sand is 60% of its saturated water content). In order to maintain the humidity of the seed, a cover is added to the top, and the mixture of the sand is placed in a warm place to germination, and a thermometer is inserted to observe the germination temperature. Hedgehog seeds generally germinate quickly and neatly at around 25 degrees. If it exceeds 35 degrees, germination is inhibited, and therefore, the temperature of germination is preferably not more than 25 degrees.
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