Black sesame cultivation techniques

1. Soil Preparation and Fertilization: Choose fields with sandy loam or loamy soil that is loose, well-aerated, and moderately fertile. Apply fertilizers at the end of May or early June. Use 10-15 kg of urea or 20-25 kg of ammonium bicarbonate per mu, along with 5-10 kg of potassium chloride. This ensures proper nutrient supply for healthy plant growth.

2. Seed Treatment: Soak seeds 1-2 days before sowing to improve germination. To prevent diseases such as black spot and stem blight, soak the seeds in warm water (50-55°C) for 15 minutes. After cooling, allow them to air dry before planting. Plant approximately 0.5 kg of seeds per mu to ensure adequate spacing and density.

3. Seedling Thinning and Transplanting: Once the seedlings have developed 2-3 pairs of true leaves, transplant them into the field. Maintain a spacing of 15-20 cm between plants. Thin out weak seedlings and keep only 8,000 to 10,000 strong seedlings per mu to promote better growth and yield.

4. Timely Pinching: About 10-20 days after the initial flowering, pinch off the main stem and the top portion of each branch by about 1 cm. This practice helps control excessive vegetative growth and encourages more flower and seed production.

5. Disease Prevention and Control: After the black sesame sprouts and during rapid stalk growth, spray the plants with a 50% puerarin solution diluted 800-1000 times. Repeat the spraying every 5-7 days for 2-3 applications. This effective method helps prevent black spot, leaf blight, and stem blight, ensuring healthier crops.

6. Timely Harvesting: Sesame plants mature unevenly, so timing is crucial. Harvesting too early may result in underdeveloped upper seeds, while harvesting too late can cause lower seeds to fall off and reduce yield. It's best to harvest during the latter half of the flowering period, about 5 days after pinching. After harvesting, let the plants dry for a while before threshing to ensure full seed maturity and higher quality.

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