Rice rotting is a general term for rotten seedlings, rotten buds and dead seedlings in the field. It can be divided into two kinds: physiological and invasive. Physiological rotting is mainly caused by improper management of low temperature and farmland. Infectious rotten roaches are Caused by pathogenic parasites, such as rice cotton rot, rice spoilage disease and rice blast disease. Low temperature and improper management, seedlings grow weak, can easily cause bacteria infection, accelerate the death of seedlings. It is hoped that the majority of farmers will effectively strengthen the management of the land, cultivate strong seedlings, and guard against the raging of rice.

First, the symptoms of damage

1. Rotten seed: When the rice seeds are sown, the embryos turn black, stink, and even rot, mostly caused by moisture during storage, impregnation by soaking, change of water without attendance, and germination temperature is too high or too low for a long time.

2. Bad shoots: The phenomenon of buds and roots dying from germination of seeds to turning green. Physiological rotting buds and infectious rotten buds are often caused by water shortages in hypoxic or hot water and high-temperature hot buds.

3. Dead seedlings: The seedlings of the first leaf after the death of the seedlings began to develop, which mostly occurred in the 2-3 leaf stage. They were divided into two types: greenish-dry type and yellow-dry type. They were mainly caused by water shortage, such as in case of low temperature or cold after the storm. Speed ​​up dead seedlings. The wilting dead seedlings do not spit water at the tips of the leaves, and the heart is wilting and tube-shaped. The lower leaves are then wilted and reeled. The seedlings are contaminated with green and die, commonly known as "center of death", with dark roots and few root hairs. Yellow dry dead seedlings start from the lower leaves, and the tips of the leaves gradually turn yellow to the leaf base, then extend from the lower to upper leaves, and finally the stem base is softened and browned, and the seedlings are tan and dead, commonly known as “skin dead”.

Second, the law of occurrence

Low temperature and oxygen deficiency are the main causes of rotting. Among them, the pathogens of cotton rot and spoilage disease often live in the soil and sewage, and are mainly spread by irrigation water and soil, and are easy to occur in the water. Rhizoctonia solani is overwintering in the soil or in the residual body, and it spreads by airflow, and it mostly occurs in drought and flood and semi-arid areas.

The rot in rice is caused by freezing injury or injury, and it later evolves into an invasive disease. The second cause is cotton rot and pyomyces. Oxygen production on the production of low temperature easily lead to disease, cold, low temperature, rain, water depth of Putian, organic fertilizer is not decomposed and other favorable conditions.

Third, control methods

1, preventive measures

Appropriate sowing: The average daily temperature of rice sowing requires stable temperature above 12°C. If it is below 12°C and persists for more than 3 days, it will be susceptible to rot. The cold tail warmer should be mastered. Wet seedlings are used to cover the mulch after sowing, so as to keep warm and cold. After sowing, as long as 4 sunny days, the young roots will be able to plunge. If they encounter cold waves, they will not be vulnerable.

Selection of Putian: Putian should be arranged in the middle of fertility, sheltered from the sun, slightly higher terrain, abundant sunshine, easy irrigation and drainage of land, fine soil preparation after plowing, moderate hardness, good ventilation, do not muddy soil, pay special attention Level the surface so as to avoid the water in the lower area. When making mash, mix 70% of dexamethasone wettable powder in mud with 1.2 kg per acre to prevent blight; before sowing seeds, use 600 times liquid of 50% Daisenam Emulsion to prevent early dead seedlings.

Reasonable fertilization: The principle of fertilization is based on fertilization. The top-dressing second-fertilizer is weaning fertilizer and marrying manure, combined with whole planting, and the application of manure is 75 kg of decomposed manure, 20 kg of superphosphate, 6 kg of potassium chloride; Weaning manure, 13 kilograms of compound fertilizer applied per mu, and 10 kilograms of urea per hectare of fertilizer applied 6 days before transplanting, to ensure that the seedlings grow robustly, enhance disease resistance, achieve the goal of nurturing strong and strong, and lay a solid foundation for field growth. .

Scientific water: The bud is mainly rooted and standing, keeping the surface moist and not flooding, and not in the morning to ensure the oxygen needs to prevent budding. In the event of the onset of the cold wave, the mulch film was applied. The mulching membranes at the ends of the two leaves were opened to ventilate and ventilate. At the three-leaf stage, the membranes were lifted to keep the seedlings moist, and the surface was kept moist. The rainstorms were well drained and the water could not be flooded. In short, wet earthworms should be based on shallow ground water irrigation, dry and wet and wet as the principle.

2. Rescue measures

1Before one leaf, replace dried or drained water every day sooner or later, and spray it with 1,000 times of copper sulfate, or use 0.2 kg of copper sulfate per mu, and wrap it with a gauze on the water inlet to make it melt with the water. Inflow into Putian; or spray with 70% enemy powder 1000 times to stop the expansion of dead seedlings.

2 After one leaf and one heart, he used 25% metalaxyl 800 times for prevention and treatment of cotton rot. Against damp blight, it was treated with 65% dichlorine 700 times.

3 Before and after the two-leaf heart, it is the critical period to prevent the dead seedlings. After the rot has been found, the above-mentioned measures should be taken while applying foliar fertilizer, potassium dihydrogen phosphate 300-500 times.

Note that the application should be on a cloudy or sunny evening.

Organic Red Dates

Organic Chinese red dates are also called red jujube. It can be used for medicinal purposes. It has the effects of nourishing the stomach, strengthening the spleen, nourishing blood, nourishing, and strengthening the body. The date and root can be used as medicine. The date can be soothing and is one of the important drugs. Organic jujube is warm and sweet, with the functions of nourishing blood, strengthening the spleen and stomach, and preventing wind. It is used to treat allergic purpura, anemia, hypertension, acute and chronic hepatitis, and cirrhosis in patients with elevated serum transaminases, and is an ideal choice for preventing blood transfusion reactions.

Red Dates,Organic Chinese Red Dates,Dried Red Dates,Organic Jujube Dried

Organicway (xi'an) Food Ingredients Inc. , https://www.organic-powders.com