In the early growth stage of transplanted rapeseed seedlings, it's common to observe symptoms such as reddish or yellowing leaves, curled leaf tips, slow or halted growth, and overall poor development. These issues can be alarming for farmers. So, how can you prevent your rape seedlings from dying? Here are some practical tips from **China Pesticide Network**:
One major cause of seedling weakness is either drought or waterlogging. Drought leads to wilting, especially in the afternoon, while waterlogged soil can suffocate roots and cause similar problems. If the soil surface is dry, cracked, and hard, it’s a sign of dehydration. For drought-stressed seedlings, consider no-till transplanting and use furrow irrigation. Water up to two-thirds of the ditch depth to allow proper moisture penetration. After transplanting, apply a new high-fat film at 600 times dilution. This helps retain soil moisture, reduces evaporation, and protects against pests and diseases. It also speeds up the seedling adaptation process, helping them grow healthier.
For waterlogged conditions, improve drainage by deepening or clearing ditches. Combine this with soil cultivation and apply ash or well-decomposed organic fertilizer to warm the soil and promote root growth.
Soil compaction is another issue that hinders root development. Proper tilling is essential. Spraying a new high-fat film at 600 times dilution can help protect against water loss, sun damage, and soil crusting. It also acts as a barrier against pests and diseases, promoting better root development.
Nutrient deficiency can also lead to weak seedlings. Nitrogen deficiency causes stunted growth, narrow leaves, and yellow-green foliage, with red discoloration at the base of the stem. Apply quick-acting nitrogen fertilizer if these symptoms appear. Phosphorus deficiency shows as dark green upper leaves and purple-red lower leaves, with stunted roots. A spray of 0.3% potassium dihydrogen phosphate solution, applied 2–3 times every 3–5 days, can help. Boron deficiency may result in slow growth, dead heart syndrome, and purple leaves. In such cases, a foliar spray of new high-fat film plus 0.1% borax solution (30–40 kg per acre) can be effective.
Pests and diseases are also common causes of seedling death. Aphids and viral infections can weaken plants and spread disease. To manage aphids, use a combination of new high-fat film and 100% insecticide spray. If viral symptoms appear, apply new high-fat film mixed with 5% bactericidal clear solution at 300–400 times dilution to control the spread.
By addressing these factors—water, soil, nutrients, and pests—you can significantly improve the survival and growth of your rapeseed seedlings. Taking timely and proper actions ensures a strong start for your crop.
Suzhou FUJI Precision Elevator Co.,Ltd , https://www.profuji.com