See Rape Leaf Color Symptomatic Management

Rapeseed often form a large number of "red leaf seedlings" in winter. In order to facilitate the management of seedlings and symptomatic diseases, the corresponding prevention and control measures are separately introduced according to the reasons for the formation of red leaf seedlings:

Nitrogen deficiency: The plants are short and the new leaves are born slowly. The leaves are small and small, yellow-green to yellow, and the leaf margins are red. Control measures: Measure 8 to 10 kilograms of urea per mu or 20 to 30 kilograms of ammonium bicarbonate, or use 750 to 1,000 kilograms of human waste to pour water; late nitrogen deficiency, with 1 to 2% urea solution foliar spray.

Phosphorus deficiency: Rapeseed is a phosphorus-loving crop, which requires more than one-fold more phosphorus than cereal crops. In the absence of phosphorus, the plants were short, with slow growth, delayed leaf emergence, small leaf area, dark green leaves, lack of luster, purple-red spots or plaques on the edges, and veins on the back of leaf petioles and leaves turning purple-red. Prevention and control measures: Use 25-30 kg of superphosphate per acre to chase or apply water to the soil, the sooner the effect is better, and later use 1% of superphosphate calcium leachate to be sprayed.

Boron deficiency: Rape is a boron-rich crop, its boron content in dry matter is 32.5-36 times higher than that of wheat and rice and other crops; when boron is deficient, the leaves initially turn dark green, leaf shape becomes smaller, and the leaf mass becomes thicker. It becomes brittle and the leaf ends are unwound and crumpled. Then it turned purple from the edge of the lower middle of the leaf, and developed into the interior, and then became blue-purple; the yellow veins and its nearby tissues turned yellow, resulting in the formation of blue and purple patches. Finally, some leaf margins die and the entire leaf turns yellow and falls off early. Control measures: Foliar spraying with 0.1 to 0.2% borax solution.

Waterlogging: too much rain before the winter, or paddy field transplant, poor water filtration, causing waterlogging injury, dark green leaves, and some will be dead root rot. Prevention and control measures: timely drainage of water to reduce the groundwater level; cultivating loose soil, improve soil permeability conditions, and promote root development.

Freezing damage: When the winter temperature suddenly drops below 0°C, the leaves will also appear red when they are frozen. Prevention and control measures: Combine with cultivator clearing ditch, planting soil and removing roots, adding organic fertilizers to reduce freezing damage.

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