How to shorten the rejuvenation period of rice seedlings after transplanting

After transplanting, rice generally changes from green to yellow, and then from yellow to green. This period of time is called returning to green. The period of returning to youth is usually 7-10 days. If measures are taken to shorten the period of returning to youth to 2-3 days, "one short" and "three early" can be achieved. That is, shortening the period of returning to green, promoting early growth, early tillering and early heading. In this way, we can strive for more ears, avoid low temperature and cold injury in August, and achieve high yield and bumper harvest. There are 5 measures to shorten the green period of rice seedlings.

Cultivate strong seedlings

The peasant proverb says, "the rice seedling is half the grain." On the basis of cultivating strong seedlings, the application of "marriage fertilizer" 4-6 days before transplanting can promote the germination of new roots of seedlings, so that the seedlings can grow longer day and night after transplanting and shorten the period of returning to green. Topdressing "marriage fertilizer" should be timely, if too early, the new root germination and growth is too long, the seedling is too tender, the plant damage is serious, resulting in the delay of returning to green period after transplanting, too late, the seedling transfer has not been absorbed, can not play the role of "marriage". The amount of fertilization, generally 2-5 kg urea per mu of seedling field, good seedling quality, high soil fertility can be applied less.

Apply sufficient base fertilizer

In order to make the rice seedlings turn green quickly after transplanting, it is necessary to apply sufficient base fertilizer. Farm manure should be the main base fertilizer, and chemical fertilizer should be applied properly. At present, there are common problems in production: first, the amount of fertilization is insufficient; second, the application of farm manure is small, the technology of accumulation, management and storage is extensive, and the quality of fertilizer is not high. In order to give full play to the role of base fertilizer, the fertilization method of "crude fertilizer and fine fertilizer" should be adopted, that is, farm manure should be spread evenly during the whole field, buried in the plough layer when ploughing, and then applied to the soil surface with quick-acting fertilizer before transplanting to meet the needs of turning green and early tillering.

Attach importance to water, skin and fertilizer

Water skin fertilizer is also called rake fertilizer. When rice is transplanted, the air temperature and soil temperature are low, and the fertilizer decomposes slowly. In order to facilitate the early green of rice seedlings after transplanting, attention should be paid to the application of water skin fertilizer. Before the last field rake, spread the available nitrogen fertilizer evenly on the field, rake in time, and bury the fertilizer in the topsoil layer 3-6 cm deep. The amount of fertilizer application is generally 3-5 kg of urea per mu, or 10 kg of ammonium bicarbonate. This can ensure that the seedlings can be fertilized and green in time after transplanting, promote early growth and rapid development, strong stalks and ears.

Suitable age transplanting

It is necessary to grasp the seedling age and transplant at the right time. If the seedling grows in the seedling field for too long, it will enter the reproductive growth earlier, and the young panicle differentiation has already begun when transplanting. In this way, the over-aged seedlings are called "taking the fetus on the sedan chair". After transplanting, they turn green very slowly and do not sprout. Therefore, it is necessary to transplant good rice seedlings at the right age to ensure the normal growth of rice seedlings and lay a good foundation for high yield.

Timely management

In the early stage of transplanting rice seedlings, the seedlings are tender and weak, not only afraid of flooding deep water, but also afraid of running out of water and suffering from drought. At this time, it is necessary to carry out regular irrigation in shallow water, which is conducive to raising the soil temperature and promoting early rejuvenation. 7-10 days after transplanting, the first fertilizer was applied to promote early tillering.