What are the key technical points for flat-planting narrow-row dense planting of soybeans?

Key technical points for flat-planting narrow-row dense planting of soybeans:

1. Seed and treatment: For variety selection, choose suitable varieties according to the local ecological type and local conditions.

2. Seed quality: It must reach Grade II improved seed or above under the seed grading standard.

3. Seed treatment: Use seed coating agent for seed dressing, selected according to the types of pests and diseases and soil conditions.

4. Rotation and tillage land preparation: For crop rotation, use a rotation of more than 3 years, do not plant continuously or on adjacent stubble, and the previous crop should mainly be wheat-type crops. For tillage, adopt mainly deep loosening, combining loosening and harrowing, to facilitate drought resistance and moisture conservation.

5. Fertilization: Carry out as a separate operation from sowing; apply deep fertilizer in autumn or apply in layers 7 cm and 14 cm below the seed.

6. Sowing: Begin sowing when the soil temperature stably passes 7 to 8°C.

7. Sowing method: For flat-planting narrow-row dense planting, a 24-row seeder can be used, blocking every other opening. Sowing row spacing: 15 to 30 cm, to bring into play the combined yield potential of the population and individual plants. Sowing depth: 3 to 5 cm after compaction. Sowing density: For varieties currently used in production, the sowing density can be 400,000 plants per hectare; for backup lines suitable for flat-planting narrow-row dense planting, the sowing density can be 500,000 plants. Sowing quality: uniform sowing with no gaps.

8. Field management: For flat-planting dense planting with 30 cm row spacing, hoeing can be done twice during the growth period.

9. Pest and disease control: For pod borers, use pyrethroid pesticides such as 2.5% deltamethrin emulsifiable concentrate.

10. Harvest: At harvest, use a mechanical combine harvester when all leaves have fallen and the soybeans rattle in the pod.