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Daejeon's spring management
In the early stages of cultivation, it's crucial to return to Qingshui for timely irrigation and promote the recovery of seedlings. Early spring is a critical period when the soil thaws quickly and shallowly. At this time, it's important to loosen the soil, remove compaction, and clear weeds, pests, and fallen leaves. This helps raise the ground temperature and encourages early growth of the plants. For late-sown or underdeveloped rapeseed fields in late February to early March, applying 6.5 tons of urea per mu is recommended, combined with careful application to weak seedlings to help them recover and grow stronger. However, fertilizer should not be overused or applied too late, as this can lead to excessive vegetative growth, delayed maturity, and lodging.
For fields where the plants are healthy, well-fertilized, and have sufficient winter nutrients, timely field cultivation is essential to maintain good growth conditions.
Disease and pest control is also vital during this period. The main diseases to watch out for include viral disease, sclerotinia, white rust, and downy mildew, while aphids and stem borer are the primary pests. Due to the warm winter and rainy spring, with slow temperature increases, these issues tend to occur more frequently.
Boron-deficient hybrid rapeseed varieties are particularly sensitive to boron deficiency, which can hinder the expression of their hybrid vigor. Phosphorus deficiency can affect nutrient accumulation, reduce grain filling, and increase the number of empty pods. To address this, it's recommended to spray a mixture of boron and phosphorus in mid to late March. Mix 100 grams of borax and 100 grams of potassium dihydrogen phosphate in 50 kg of water per mu. It's best to combine this with pesticide application for better results. A common formula includes 100 grams of borax, 100 grams of potassium dihydrogen phosphate, 1000 grams of urea, 50 ml of omethoate or phoxim, and 50 kg of water. This solution should be sprayed on sunny afternoons for optimal absorption and effectiveness.