Rhubarb cultivation techniques
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August 29 02:27:24, 2025
1. **Appropriate Species**: Rhubarb thrives well in mountainous regions at altitudes above 1,500 meters. It exhibits strong growth performance under such conditions due to the cool climate and suitable soil structure.
2. **Site Preparation and Fertilization**: The ideal soil for rhubarb is deep, loose, fertile, and well-drained with a humus-rich composition. A slightly alkaline sandy soil is also favorable. In early spring, after the snow has melted, it's recommended to apply more than 5,000 kg of high-quality farmyard manure per mu. The fertilizer should be evenly spread on the surface and then incorporated into the soil through plowing to a depth of approximately 30 cm. The land should be thoroughly tilled and leveled to ensure optimal growing conditions.
3. **Seed Treatment**: Rhubarb is primarily propagated by seeds. Select fully mature seeds from three-year-old plants. Soak the seeds in water at 20–30°C for 4–8 hours, then mix them with sand or fine soil in a ratio of 2–3 times the seed weight. Place the mixture in a sunny pit or cover it with a damp cloth and turn it twice daily. Once a small portion of the seeds begins to germinate, the seeds can be sown once the covering material is slightly dry.
4. **Planting Methods**: There are two main planting methods: direct seeding and transplanting seedlings.
(1) **Direct Seeding (Broadcasting)**: Sow seeds across the entire plot with a spacing of 60 cm between rows and 45 cm between plants. Dig holes about 3 cm deep and place 5–6 seeds in each hole. Cover the seeds with 1–2 cm of soil and gently press down to ensure good contact with the soil. After sowing, spray trichlorfon powder on the ground to protect the young shoots and leaves from insect damage. The recommended amount is 2–2.5 kg per mu.
(2) **Transplanting Seedlings**: When raising seedlings, prepare a bed that is 100 cm wide and level it. Water the bed thoroughly. Once the surface soil is slightly dry, dig shallow trenches 3 cm deep and space the seedlings 15–16 cm apart. Sow the seeds evenly in the trenches, ensuring the soil covers them without exposing the seeds. The best time for spring sowing is during the Qingming to Guyu periods, while autumn sowing is recommended from the Great Heat to the Beginning of Autumn. Autumn-sown seeds generally have a higher germination rate and produce stronger seedlings, leading to better yields. Spring-grown seedlings are transplanted the following spring around Qingming, while autumn seedlings are transplanted in the following autumn.
When transplanting, dig trenches 60 cm apart and about 30 cm deep. Mix 5,000 kg of farmyard manure into the trench soil using a shovel to ensure even distribution. Level the trench and plant the seedlings. Before the Qingming period, when the seedlings begin to sprout, carefully dig up the seedlings, selecting only the strongest ones. Trim the lateral roots and tails slightly before planting. Lay the bud heads flat in the trench, keeping them about 3 cm away from the edge, and maintain a row spacing of 30–45 cm. Finally, cover the seedlings with soil.