When it comes to the transplanting season, how can rice seedlings take root? What are the management techniques? How to control bacterial wilt and bacterial wilt?

Rice is not only a kind of herbaceous rice, but also the most important and oldest kind of grain in rice. As the transplanting season is approaching, how can rice seedlings have good roots? What are the management techniques? How to control bacterial wilt and bacterial wilt?

When it comes to the transplanting season, how can rice seedlings take root?

1. Load appropriate amount of mud and clean the surface of the disk. The mud should not be too thick. Sweep the mud evenly with a bamboo broom, sweep away the excess mud, and gently collapse the valley with a soft broom after sowing. Such as raising seedlings with dry fine soil, first fill half the hole with fine soil, sweep the over-full fine soil with a bamboo broom, cover a layer of fine soil after sowing, and then sweep the surface soil and sprinkle enough water.

2. The water management of seedling field insists on wet before and drought after. Keep sufficient moisture in the pan soil from sowing to seedling emergence; drain the seedling ditch water after the three-leaf one-heart stage, mainly dry cultivation, only in the long-term sunny, hot and dry weather, the early rice seedlings need to be irrigated with horse water or water for a short time to protect the seedlings, and generally do not establish a water layer on the disk.

3. Throw the plant in time. When the leaf age of the seedling reaches 3.5 leaves and the seedling height reaches 10cm, we can choose sunny weather to plant in time.

The seedlings (aquatic roots) of rice seedlings raised in water. The number of roots in the root system is less, the root tip is less, the root injury is serious during transplanting, and the rice seedlings turn green slowly and for a long time.

Wet rice seedlings (wet roots). Compared with the water-raised seedlings, the roots increased, the sparse fibrous roots and the root tips had root hairs, the green time of the seedlings was shorter, the tillering stage was earlier, and the number of tillers was increased.

The seedling (xerophytic root) of dry rice seedlings. There are many fibrous roots, many root hairs, many root tips, developed roots, the ability of absorbing water and fertilizer is obviously enhanced, the seedlings turn green quickly, the tillers are early, and the effective tillers are obviously increased.

The xerophytic root system of rice seedlings raised in rice bowl is more developed, and there is no slow seedling process after transplanting rice seedlings, which is one of the best ways to cultivate strong seedlings in high-yield cultivation at present.

What are the management techniques of rice seedling stage?

1, temperature management: before the needle is mainly heat preservation, keep the film about 30 ℃ to promote seedling emergence, when the seedling grows to 1.5 ℃ 2-leaf stage, we should pay attention to cooling and refining seedlings, the temperature in the film should be controlled at about 25 ℃, the two ends should be ventilated to cool down, when the seedling grows to the three-leaf stage, cover the seedlings in sunny day and night, and the temperature is stable at about 10 ℃, you can remove the film to cultivate ideal seedlings.

2. Water management: on the basis of watering enough bottom water during sowing, there is generally no need to water before emergence. If insufficient water is found and the bed surface is dry and white, it should be watered in time. When the seedling is green, it should be watered once, 1 leaf and 1 heart, combined with ventilation and seedling watering, watering later as appropriate, replenishing water in time when the film is removed, and squatting seedlings in the sun bed for 7 days before transplanting.

3. Fertilizer management: generally, there is no fertilization at seedling stage. 2After the 3-leaf stage, fertilizers can be applied according to the growth situation, and potassium dihydrogen diphosphate is sprayed once. If fertilization is needed, 5 kg urea per mu can be properly applied 10 days before transplanting, which not only increases the cold resistance of seedlings, accelerates turning green, but also promotes early tillering.

4. Weed control in seedbed: artificial weeding is the main method, and the use of herbicides with high efficiency, high toxicity and high residue is strictly prohibited. The weeds in the field were pulled out manually before transplanting.

How to control bacterial wilt and bacterial wilt of rice seedlings?

The main results are as follows: 1. The causes of rice bacterial wilt are as follows: low temperature, excessive temperature difference, alkaline soil, lack of light, thin and weak seedlings, excessive seed quantity and so on.

2. The main causes of rice blight are: low temperature, excessive temperature difference, alkaline soil, lack of light, thin and weak seedlings, high density and so on.

3. To buy disinfectants and fungicides for Rhizoctonia solani: for Fusarium oxysporum, Rhizoctonia sclerotiorum and mold, choose effective disinfection and fungicides, such as dimethrin, metalaxyl, thiram, azoxystrobin and so on.

4. The pathogen invades from the seedling root, so it is necessary to use rooting and growth-regulating agents, such as rooting powder, biological agent (bacterial doctor), brassinolide, Wukangwang and so on. Pay attention to the above two aspects, choose the regular manufacturer medicine, the content is enough, the effect is good.

5. After taking medicine, we must pay attention to the following points in order to effectively control the disease and gradually relieve it.

(1) avoid repeated use of drugs

Farmers with diseased seedlings were worried that spraying once was not good, and the next day and the third day they were sprayed again. As a result, the spraying became more and more serious, and the speed of seedling death was accelerated. The best interval between the two drugs is 5-7 days, continuous use of drugs will cause drug poisoning, but not conducive to the control of the disease. If drug poisoning occurs, the symptoms can be relieved by foliar spraying bacteria doctor + Wukang king.

(2) the second use of medicine should be changed.

If Rhizoctonia solanacearum does not take effect after 5-7 days, the second medication should be changed to avoid the same use of drugs, resulting in resistance and affecting the treatment.

(3) avoid excessive humidity after medication.

After using the medicine, disinfectants and fungicides will kill Rhizoctonia solanacearum in the soil, but if the disease is to be controlled and alleviated, the most important thing is to let the seedlings grow new roots. while the rooting agent works, people also have to create a dry state for rice seedlings. because "dry roots", so after spraying the seedling bed humidity can not come down, watering frequently, it is very difficult for the seedlings to produce new roots, the blight disease can not be controlled.