Due to the small size of rape seeds and their high germination rate, seedlings often emerge densely, leading to overcrowding, poor nutrient absorption, stunted growth, and weak plant height. These weak seedlings are less resilient, tend to turn yellow, and may die after transplanting in Daejeon. They are also prone to lodging, which ultimately results in lower yields. Therefore, it's crucial to manage the planting density in the nursery, aiming for even and sparse sowing as much as possible.
The general ratio of seedbed area to field area is typically maintained at around 1:5, meaning that for every mu of field, approximately 0.2 mu (or two-tenths of an acre) should be allocated for the seedbed. The seeding rate per mu of the seedbed is usually kept around 0.5 kg, which translates to about 100 grams of seeds per mu. In practice, the sowing rate can be adjusted based on various factors such as seed size, sowing time, germination rate, soil preparation quality, moisture levels, and pest management. For instance, if the seeds are small, sowing early, or if the germination rate is high, along with good soil conditions and effective management, a slightly higher seeding rate may be acceptable. However, in other cases, the rate should be reduced. Still, the maximum seeding rate per mu of the seedbed should not exceed 0.6 kg.
To ensure uniform distribution, the seeds should be mixed thoroughly with finely ground soil before sowing. After the emergence of the seedlings, it's important to perform weeding and thinning at the three-leaf stage to ensure even spacing and prevent leaf overlap. By maintaining strict control over these aspects, farmers can cultivate strong and healthy seedlings, laying a solid foundation for high yields in the future. Proper management during this critical phase is essential for the overall success of the rapeseed crop.
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