Rapeseed leaves have a reason
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Rapeseed often develops a large number of "red leaf seedlings" during the winter season. This phenomenon can be caused by various factors, including nutrient deficiencies, water stress, and environmental conditions. Understanding these causes and implementing proper control measures is essential for healthy plant growth.
Nitrogen deficiency in rapeseed results in stunted plants with slow-growing new leaves. The leaves are small, pale green to yellow, and their edges turn red. To address this, apply 8 to 10 kg of urea per mu, or 20 to 30 kg of ammonium bicarbonate, or use 750 to 1,000 kg of human manure. For late-stage nitrogen deficiency, foliar spraying with a 1% to 2% urea solution is effective.
Phosphorus-deficient plants are short, with delayed leaf development, dark green and dull leaves, and purple spots on the leaf margins. The veins and petioles may also turn purple. To correct this, top-dress with 25 to 30 kg of superphosphate per acre, or apply a leachate of superphosphate calcium. Foliar spray with 1% superphosphate solution can help in later stages.
Sulfur deficiency causes plants to be dwarf and light green, similar to nitrogen deficiency. Leaves develop large notches, curl into cups, and show purple discoloration on the back, veins, and stems. To treat this, apply 1 to 2 kg of sulfur powder per hectare, or 50 kg of gypsum during cultivation.
Boron deficiency leads to dark green, smaller, and thicker leaves that become brittle and curled at the ends. The leaf edges turn purple, eventually spreading inward and forming blue-purple patches. Yellow veins and surrounding tissues appear, leading to leaf drop. Spraying with a 0.1% to 0.2% borax solution is an effective remedy.
During the seedling stage, drought and insufficient soil moisture hinder root water absorption, causing slow growth and pale red leaves. Timely irrigation is crucial, using furrow irrigation rather than flooding to avoid root rot.
Excessive rain or transplanting in paddy fields can lead to waterlogging, damaging roots and causing dark red leaves. Drainage should be improved, and soil should be loosened to enhance permeability and promote root health.
Sudden drops in temperature below 0°C during winter can cause freezing damage, resulting in red leaves. To reduce harm, clear ditches, cultivate the soil, remove dead roots, and add organic fertilizers to improve plant resilience.
By identifying the specific issues affecting your rapeseed and applying the appropriate treatments, you can significantly improve crop health and yield. Regular monitoring and timely intervention are key to successful rapeseed cultivation.