Detailed Explanation of Dry Direct Seeding Technology for Rice and Causes of Dead Seedlings in Dry-Raised Seedlings

Rice is a type of grass in the genus Oryza, and it is also the most important and longest-cultivated grain species in the genus Oryza. Now let's introduce dry direct seeding technology for rice and the causes of dead seedlings in dry-raised seedlings. Growers should read carefully.

Direct seeding of rice mainly has the characteristics of strong drought tolerance and strong stress resistance. Compared with seedling raising and transplanting, it can save nearly 500 cubic meters of water per mu of rice field, and can solve the problems of severe drought, seriously insufficient reservoir and pond water storage, and inability to transplant according to seasonal timing. Now let's introduce direct seeding technology for rice:

1. Choose suitable fields for direct seeding: waterless transplanting fields where rice has been transplanted year after year.

2. Sun the seeds and soak them in chemicals: sun the seeds for two days in clear and warm weather to increase seed coat permeability and improve water absorption; soak the seeds with carbendazim for 2-3 days, and promote germination until the seeds break white.

3. Sowing: after soaking the field, sow when the water dries to the point that it does not stick to the feet. Use the method of pulling lines for wide and narrow row strip sowing with dibbling, 25,000 hills per mu, about 5 grains per hill, to ensure direct seeding quality and basic seedlings and lay a good foundation for increasing yield;

4. Do a good job in thinning seedlings, replanting missing seedlings, and weed control.

I. Analysis of the causes of dead seedlings in dry-raised seedlings:

In Midu County, large areas of young seedlings are growing well, but dead seedlings have appeared in some areas. According to field investigation and analysis, the main reasons affecting dead seedlings are:

1. The sowing rate is too high, the population is too large, nutrient supply is insufficient, and weak and small seedlings are prominent.

2. At sowing, the bottom water is insufficient, the temperature is high, soil moisture evaporation is large, and plant water supply and demand are unbalanced.

3. After sowing, the covering soil is too thick or too shallow, which is not conducive to the growth and development of young seedlings.

4. Seedling hardening and ventilation are not timely, and the film covering time is too long, resulting in tall and spindly seedlings, poor individual development, and weak stress resistance of seedlings.

5. The temperature is unstable, and the temperature difference between day and night is large, affecting the normal growth and development of young seedlings.

6. After uncovering the film, fertilizer and water management is improper, with too much or too little water, and weaning fertilizer applied too early or in excessive amounts.

II. Solutions:

1. Uncover the film in time for seedling hardening and control fertilizer and water.

2. Timely prevent and control rice blast and damping-off. After uncovering the film, spray vinegar water to adjust acidity and prevent the occurrence of rice blast and damping-off. At the 1-2 leaf stage of seedlings, use 10 milliliters of 30% hymexazol aqueous solution per fen, mix with 10 kilograms of water, and spray for control.