How long does it take to soak rice seeds?

It takes 48-72 hours to soak seeds below 20 ℃, 30-48 hours when seed soaking temperature is 20-25 ℃, and only 24-30 hours when seed soaking temperature is above 25 ℃. The soaking time of rice seeds sowed in the first and middle of May can be slightly longer, but not more than 60 hours; in the plastic plate throwing seedlings after May 20 and the direct seeding rice in the first and middle of June, it is suitable for all varieties to soak for 24 hours.

The main results are as follows: 1. According to the temperature of seed soaking, the time of seed soaking is determined.

The purpose of seed soaking is to make rice evenly absorb enough water needed for germination. the minimum requirement for rice seed water absorption is to absorb 26% of the seed weight to germinate normally. The rate of water absorption of rice is related to temperature, but the time of soaking seeds required for rice to absorb enough water for germination varies with water temperature. In general, it takes 48-72 hours to soak seeds below 20 ℃, 30-48 hours when seed soaking temperature is 20-25 ℃, and only 24-30 hours when seed soaking temperature is above 25 ℃. When the seed soaking temperature was 25 ℃, the germination rate decreased gradually with the extension of seed soaking time. Indica rice and a small number of japonica rice with loose glume closure absorb water faster, so the soaking time of rice seeds sowed in the first and middle of May can be slightly longer, but not more than 60 hours; in the plastic tray throwing seedlings after May 20, and direct seeding rice in the first and middle of June, it is appropriate for all varieties to soak for 24 hours, and to prolong the soaking time, the germination rate will decrease significantly.

2. The method of soaking seeds to accelerate germination is selected, and the method of "day soaking night dew" is recommended.

Rice uses the method of "day soaking and night dew" to sow seeds before sowing, which has many seedlings, strong seedling body, simple operation, easy to master, and no risk of "stuffy seed" and "sprouting". Therefore, this method is often used to soak seeds and accelerate germination in rice production. The method is as follows: first, select the good seeds in the sun for 1-2 days, then match the medicine solution according to the proportion of seed soaking and the amount of seeds, soak the seeds in the medicine solution during the day, and spread them on the ground (about 5cm in thickness) at night for dew ventilation, so that after a period of time, the chest will be broken and the bud will reach the requirement of falling valley (sowing). Do not pile the seeds in the woven bag, lest the seeds in the middle of the pocket will sprout at high temperature due to respiration, and it is not necessary to heat up the seeds.