What's the reason why rice seed germination rate is low
1, high temperature and high humidity climate cause ear buds.
In general, the higher the maturity of seed germination rate higher.Enrich plump seeds from pollination to mature generally need to 25 days time.The lowest temperature of rice seed germination of 10-15 ℃.The optimum temperature for 30-35 ℃.Due on the same plant or even on the same ear seeds in plants with different parts of the flower, a mature first, after all fully mature seed dormancy shallow easy to sprout.But not fully mature seed dormancy is deeper, often not easy to sprout.Some species, particularly prone to lodging varieties ear buds or lost easily.
2, seed harvest early, too late.
The rice seed dormant is not obvious.The seeds of early harvest not fully mature.In the case of not fully dry still to be exuberant respiration.Consumption of nutrition, so that the germination rate declined obviously.Seeds harvested too late, on the other hand, if encounter field high temperature and high humidity climate, it is easy to make seeds to be bud, results in the decrease of germination rate;Seed moisture content is high, on the other hand, not timely rainfall seed aging is accelerated, germination rate, harvest too late and missed the best drying period, easy to mildew in drying period.May also affect germination rate.
3, seed harvest thin stand, ted not in time.
Due to the breeding units FanZhong is big enough, warehouse and other conditions, green coffees which lacks the necessary drying equipment, seeds harvested without timely thin stand, make the library, at a time when ordinary seed water content is higher, leading to a heap boring kind of hair is steamed, chaff were black and mouldy.In addition, in the cement quality of a material under high temperature exposure and green coffees which are not turn in time, will seriously affect the seed germination rate.
4, mechanical damage.
Some species of chaff thin or seed full after cracking, these varieties in the fall harvest, selection process easy to shell into a brown rice.Due to remove the protective layer, these brown rice are generally difficult to sprout, even if the germination is also difficult to sprout (easy to rot) the seedling patches.
5, seed storage when moisture content is on the high side.
Because of lax, seed storage was not dry before or improper safekeeping.Seeds in the process of storage be affected with damp be affected with damp, seed moisture content was significantly higher quality standards.Where seeds breathing is very strong, on the one hand, release water vapor.Water vapor released again after absorbed by seed, the seeds become more moist;Heat release breathing on the other hand, accumulate in the seed and the temperature rising, respiration, as a result causes the local appear moldy seeds, insect, fever, sweating, such as condensation phenomenon.This is the main cause of germination rate reduce.
6, plant diseases and insect pests.
If the diseases and serious, prevention and control measures is not timely, damage the function leaf or transport corridor, reduce or lose its corresponding function, will cause the function of the seed embryos lacking, endosperm storage of nutritional deficiencies, seed plumpness is insufficient, low life force, weak sick even to germinate, it is difficult to sprout.
