Investigation and Analysis of Causes of Rice Seedlings in Dry Nursery

In last year's rice breeding process in a group of Yanggong Village, Dongxi Town, Jianyang City, two sections of diggings were used. After sowing, they were covered with arch insulation to cultivate strong seedlings for planting in Putian. Around the two-leaf stage, many nursery seedlings appear yellow seedlings dead seedlings, ranging in size from sporadic yellowing dead seedlings to large areas of yellowing dead seedlings. In particular, the seedlings sown before and after March 25 were more serious. In addition, there are also some deficiencies in film seedling management. In order to do a good job in rice breeding, we conducted a large number of investigations, carefully analyzed the causes of the yellow seedlings death, and proposed solutions for peer reference. Analysis of causes of dead yellow seedlings: Excessive and inhomogeneous fertilisers that have not been completely decomposed are the main causes of yellow seedlings. In the application of seedbed fertilizer, the farmers are using biogas fertilizer and water, and the amount of fertilizer applied per unit area is large. Take Baiyunzhao, a farmer, as an example, apply 6 picking gas fertilizers on a 4.6 m2 seedbed area, exceeding 75 kg per square meter. And on the day of sowing, the biogas fertilizer itself is not fully decomposed, and there is no decomposing time in the seedbed, which directly leads to high seedbed fertility. After the emergence of the seedlings, the young seedlings cannot survive on the overgrown seedbed. The non-sterilization before seedbed use is an important cause of dead yellow seedlings. Most of the farmers insisted on using vegetable land as the seedbed, but they all neglected the problem of disinfection of the seedbed, resulting in a large number of pathogenic bacteria in the soil. Under the condition of heat preservation and seedling breeding, the bacteria quickly propagated and directly affected the growth of seedlings. Poor film management is another cause of dead yellow seedlings. After sowing, most farmers use the method of covering the arches to conduct the incubation. However, in the post-emergence film management work, most of the cap film is kept to the 3 leaves, resulting in lack of hardening seedlings; especially in high temperature weather, the film is still adhered to, and the film is not removed in time, resulting in high temperature burning seedlings leading to dead seedlings. The solution to the problem: 1. Strengthen technical training. Strengthen the technical training for farmers, so that farmers can carefully grasp the operating procedures of the dry nursery. It is the key to ensure the success of the raising of the eel in the process of educating the eel. 2. Strict fertilizer levels. For the application of farmyard manure, it must be fully cooked and applied at least one week before sowing. After application, the soil should be turned over and mixed at least twice. Do not apply unfertilized fertilizer before and after sowing. In addition, fertilizer application should not be excessive. Especially in the two sections of the dig ponds, as long as the seedbed has moderate soil fertility, no base fertilizer can be applied. After the seedlings of the seedlings are grown, they are topdressed. 3. The bed must be sterilized. Before sowing, 15 to 20 kilograms of seedling beds per gram of water were used to disinfect seedbeds and kill pathogens. 4. Strengthen post-emergence film management. The timely removal of film and seedlings is an important technical measure for the cultivation of strong seedlings. Cover film can be divided into film or arch film. Starting from the emergence of green, pay close attention to weather changes, cloudy weather does not have to remove the film. The sunny days cover the arch membranes and the two are cooled. When the temperature rises quickly, it is fully exposed. If the seedling stage meets with a sunny day and the temperature is relatively high, it must be covered with a cover (such as straw, rice straw, etc.) to cool the membrane. After the film is generally removed from the film, the film is kept warm in the evening. For two days or so, the seedlings will not need to be covered. If the temperature is low, the cover can be uncovered for 3 to 5 consecutive days. The film is now beginning to uncover the film and open the lid for 2 days in a row on a continuous day. After 80% of the film is lifted, it can be completely uncovered. Don't stick to the long-term cover film and cultivate slim and delicate seedlings.

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