Nitrogen-deficient and yellow-leafed rapeseeds lack nitrogen and their plants are dwarf. The new leaves are born slowly, and the leaves are small. Generally, the leaf margins are red and the middle is yellow, forming yellow and red leaves. Countermeasures: Topdressing 8 to 10 kg of urea or 20 to 30 kg of ammonium bicarbonate per 667 square meters, 7.5 kg of human waste can be applied to the water, and 1% to 2% of urea solution 50 kg can also be used for foliar spraying. , spray 2 or 3 times.
Phosphorus deficiency in purple-red rapeseed can slow the growth of the plants, the leaves are small and thick, and the number of leaves is reduced. The leaf edges and petioles are purple-red to form purple-red leaves. Countermeasures: Top-up application of superphosphate 20 to 30 kg or diammonium phosphate 6 to 8 kg per 667 square meters. Foliar application of 0.2% potassium dihydrogen phosphate solution 50 kg can be sprayed for 2 to 3 times.
The potassium-deficit brown leaves are yellow spots at the beginning, and the edges of the leaves gradually appear as brown spots or brown spots, and the leaves become thick, hard and brittle, showing "burn-like". Countermeasures: Topdressing potassium chloride 8 to 18 kg per 667 square meters, or spraying 50 kg of 0.2% potassium dihydrogen phosphate solution, and spray 2 to 3 times.
Boron-boring blue-purple-leaf rape lacks boron, leaf margin rewinds, rhizomes expand, and blue-purple spots appear on the leaves. Countermeasures: Each 667 square meters with borax 80 ~ 100 grams of 60 to 70 kg of water spray, and even spray 2 to 3 times, can also be combined with top dressing application of 500 to 1000 grams per 667 square meters.
The dry and droughty rapeseed encounters drought at the seedling stage, and the lack of soil moisture will make it difficult for the rape roots to absorb water and fat, resulting in the slow growth of the rapeseed, the dwarfness of the plant, and the turning of the leaves into pale red. Countermeasures: Watering in time, furrow irrigation should be taken, flooding should not be flooded.
Flooding dark red leaves too much rain before the winter, or paddy fields transplanted, poor filtration, causing waterlogging and damage, dark red color, and some will be dead root rot. Countermeasures: Timely ditch the water, reduce the groundwater level, do a good job of cultivating the loose soil, improve the ventilation conditions, promote the vitality of the root system, and promote seedling growth.
Freezing damage to red leaf rape in the winter encountered a sudden cooling to below 0 °C when the leaves will be frozen red. Countermeasures: Combine with cultivating and arranging ditch, planting soil and removing roots, adding organic fertilizers to reduce the occurrence of frost damage.
Insects Red rapeseed is seriously damaged by the aphids during the growth process, and can also cause reddening of the leaves, and the leaves shrink and become stiff. Countermeasures: Use 50% anti-inferiority WP 15g or 2.5% emulsion liquid to kill 30ml per 667m2, spray 50kg of water.
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