Rice seedlings hit willows, and in some places there are still dead, what is the reason?

I don't know which rust you refer to, I checked it for you, I hope the following will be useful to you: Early rice seedling field fertilization technology "Seedling is good half of the grass".Reasonable fertilization of seedlings is one of the key measures for cultivating strong seedlings.

In order to achieve the standard of cultivating strong seedlings, mastering the fertilization technology of seedling field is an important link. The seedling age of double cropping early rice is about 28-30 days, due to the short seedling age period, the seedlings are required to grow fast and strong, but the seedling raising season is when the temperature is low, the nutrient release and fertilizer decomposition in the soil are slow, so high-quality and fast-acting fertilizer should be reapplied. For example, organic fertilizers such as human manure, plant ash and young green manure that are easy to decompose are used as base fertilizers for seedling fields.

Nitrogen is the most important nutrient required at the rice seedling stage, followed by phosphorus and potassium. Therefore, organic fertilizer alone cannot meet the requirements of seedling production in a timely manner in terms of quantity and time, and nitrogen, phosphorus and potassium fertilizers must be applied in a timely and appropriate manner. In the past, nitrogen fertilizer was generally only applied as top dressing, but in the case of insufficient amount of organic fertilizer, the application of a certain amount of nitrogen fertilizer as basal fertilizer has a good effect.

It can achieve the effect of fertilizing the soil and fertilizing the seedlings with the soil, so that the fertilizer supply is balanced and the seedling production is robust and neat. Early rice seedlings according to the appearance of the seedlings for top dressing, is very important, the first top dressing "weaning fertilizer", about 15 days after sowing, that is, seedlings two leaves one heart period or three leaves one heart period, per mu urea 5 kg or 10 kg of ammonium sulfate; The second time is "giving fertilizer to the bridal".

Now there is a phenomenon of dead seedlings in rice.

It may be caused by a lack of water in the seedbed. It is recommended that you use 70% gram square meter of dimethyl soluble agent or 10 billion grams of Bacillus subtilis, 2-4 grams square meter for spraying control.

At present, the main reason for the yellowing of rice seedlings and the death of rotten seedlings is bai

First, the lack of sunlight and the sudden drop in temperature caused it. At present, the rice seedlings that have been sown in the low-altitude areas of western Chongqing and northeast Chongqing have entered the seedling stage one after another, and due to the low temperature below 10 after sowing, the sugar content of the seedlings is low and the cold resistance is reduced. The sudden drop in temperature leads to the destruction of the cell membrane of the seedling roots, the permeability is enhanced, the exudation of amino acids and other inclusions increases, and the rhizometric Pythium multiplies rapidly and invades the roots, which weakens the root absorption function, and the seedling beds in some areas have cotton rot and a tendency to spread.

Second, the lack of base fertilizer in the seedbed causes yellowing. The nutrient supply of the normal growth of seedlings before the three leaves mainly depends on the endosperm, and the roots absorb from the soil after the three leaves, if the seedbed base fertilizer application is insufficient, it is easy to cause nitrogen deficiency and lead to the yellowing of seedlings. You can use carbon saturation fertilizer + rooting agent.

Third, the high pH value of the seedbed causes yellowing. The soil pH suitable for rice growth is nearly neutral, and the soil pH has a great impact on the transformation of soil nutrients, especially on the availability of phosphorus and trace elements, which directly affects the growth of rice seedlings. Rice seedlings prefer acidic soil, if the pH value is high, it will affect the absorption of nutrients by seedlings, resulting in malnutrition and yellowing.

Fourth, the seeds and soil disinfection in some places are not thorough, and the soaking and germination are improper, which provides a bacterial source for the germ to infect the seedlings, and the lower the temperature and the longer the duration of rice after sowing, the more serious the cotton rot may be. If the temperature rises too fast in the later stage, the temperature difference is too large and it is easy to cause green wilt and dead seedlings; At the same time, the invasion of pathogens will be aggravated and cause yellow wilt seedlings.

Seedling rot, blight, rice blast, infetophthora disease, seedling disease, micrococcus sclerotinia sclerotinia and low temperature chilling injury are the six major obstacles and difficult diseases in rice production. 1. Rice seedling rot disease is a general term for the death of rice seeds and seedlings in the paddy field stage, which occurs in all rice areas of the country, and is divided into two kinds: physiological seedling rot and infectious seedling rot, and infectious seedling rot refers to the cause of cotton rot fungus, spoilage fungus and Fusarium. 2. Rice blight Rice blight is a common disease of rice, which has a great impact on the quality of rice seedlings.

There are two types of rice blight: physiological blight and pathological blight. The main cause of physiological blight is that the seedlings are not suitable for soil pH, water, fertilizer, gas and heat conditions, and the symptoms of disease appear, which are manifested as dwarfing, yellowing, few new roots or no new roots, when it is light, the seedlings in the seedbed turn yellow, the disease center becomes a pot bottom yellowing, and the seedlings die in pieces when it is heavy; Pathological blight is a kind of disease caused by pathogenic fungal infection in the soil, which is manifested as rot, dwarfing, yellowing at the base of the seedling plant, and the root is easy to break when the plant is pulled out by hand, and the two kinds of blight are very serious to the rice seedlings. 3. Prevention and control of rice blast It is also known as rice fever, commonly known as fire blast and hanging head blast.

Rice blast is the most epidemic disease that threatens rice production, and it is also a common and important disease in all rice areas of China. When the conditions are right, it can erupt quickly and widely in a short period of time. Especially in the case of high temperature and humid weather conditions, once the panicle blast and branch disease occur, it will cause extremely heavy losses to rice farmers. One acre of disease, one acre of extinction; One is sick, and one is extinct.

The disease is caused by infection with Rice Pear Bacteria. Under natural conditions, rice blast only infects rice. Rice blast affects all parts of rice and occurs throughout the growing season of rice.

4. Phytophthora rice has occurred in the southern rice region since the 70s. Seedling damage can cause 15 20 dead seedlings, and undead seedlings can also cause some leaves to die, affecting growth. Caused by Phytophthora seedlings.

It mainly harms early and middle rice seedlings. 5. Rice seedling disease, also known as the disease of the elder seedling, the disease of red deer seedlings, the barrel of the gun, the male rice, this disease is widely distributed, and it is one of the main diseases in rice production. It has occurred in all major rice areas across the country, and the harm is serious.

Rice occurs from the seedling stage to the heading stage. Diseased seedlings wilt and die. 6. Rice Sclerotinia sclerotinia There are several sclerotinia diseases in rice producing areas, among which the more harmful is Sclerotinia sclerotinia.

It is caused by infection with Helminospora fiduliformis. Affected plots generally reduce yields by 10% to 25%. In some years, a large area of rice plants was lodging.

The best way to prevent and control the above six major rice diseases and physiological diseases caused by vitamin and mineral deficiency caused by low temperature chilling injury is to apply "Tianda 2116" Zhuang Miao Ling + Tianda Oxalen. or 50% Tianda Pythium + "Tianda 2116" Zhuang Miao Ling.

Answer: The large-scale death of the rice field is because the rice you planted is sick, it is recommended that you quickly go to the Internet to check and treat the symptoms as soon as possible**.