Rape leaf color diagnosis and remedial measures
First, the red leaves
(1) Drought of red-leafed rapeseed is slow at the seedling stage, and the plants are dwarfed, and the leaf color becomes light red. Red-leaf rape caused by drought should be watered and drought-resistant in time. Watering to ditch irrigation, can not be flooded, so as not to cause rot dead seedlings.
(2) Waterlogging of red-leaf rapeseed during the seedling stage will cause excessive waterlogging, which will result in waterlogging. In management, deep trenches should be opened to lower the groundwater level and eliminate waterlogging.
(3) Infestation When the aphid of rape seedlings is severe during the seedling stage, the leaves shrink and become stiff and red. In this regard, can use 50% anti-inferiority WP 10-20g, spray 20-30kg of water.
(d) Frozen leaves damaged by red leaf rape in the winter when the temperature suddenly dropped below 0 °C, the leaves will be frozen red. In this regard, it is possible to combine cultivators with about 100 kg of plant ash per acre in order to reduce the risk of freezing.
Second, yellow leaves
(1) In the absence of nitrogen fertilizer at the seedling stage of nitrogen-deficient yellow rapeseed, the plants are dwarf, the leaves are small, new leaves are born slowly, and the leaves gradually become yellow-green or yellow, and sometimes the leaves on the lower part of the leaves turn yellow and gradually expand to the veins. In this regard, the application of ammonium bicarbonate 15-20 kg per acre for remediation, can also use 1% -2% of urea liquid for foliar spray.
(2) Sulfur-deficient yellow leaves The sulfur-deficient yellow leaves are different from the nitrogen-deficient yellow leaves. The lack of sulfur starts from the young leaves and begins to yellow, while the deficiency of nitrogen is from the old leaves to the new leaves. The two cannot be confused. The sulfur-deficient rapeseed can be combined with 10 kg of gypsum powder per acre for intertillage to promote leaf color transformation.
(3) Yellow leaf disease caused by acid damage yellow leaf often shows that the new leaves are yellow, and then fall off. Remedy can be applied per acre lime 50kg, ash 50kg, and soil acidity, eliminating acid damage.
Third, brown leaves
The appearance of brown rape leaves is the performance of potassium deficiency, starting from the old leaves, and then to the heart of the leaf development, initially yellow and white spots, cobs and brown spots appear at the tips of leaves and leaves. The leaves become thick, hard and brittle, and the leaves die. Remedial measures can be taken at the seedling stage potassium deficiency per gram of potassium chloride 7-10kg or 100kg per mu, and 100kg in the flood season, potassium can be sprayed with 0.1%-0.2% potassium dihydrogen phosphate solution 50-80kg, and even spray 2— 3 times.
Fourth, dark purple leaves
The dark purple leaves of rape are caused by phosphorus deficiency. They are characterized by slow growth, small and small leaves, lack of luster, purple petiole, purple-red spots on the edges, and dark purple when severe, and gradually wither. Remedial measures in the seedling stage combined with cultivating 25-30kg of calcium phosphate per acre, late phosphorus deficiency with 1% of the superphosphate soaking liquid spray, 50-80kg per acre, and even spray 2-3 times.
Five, purple blue leaves
The blue-purple leaves of rape are a symbol of boron deficiency. It is characterized by the initial dark green leaves, leaves become smaller, leaf thickening, become brittle, leaf rewinding, shrinking and uneven. The edges of the middle and lower leaves begin to turn purple and gradually develop towards the interior. The veins and nearby tissues turn yellow to form blue-purple spots. Remedy can be used in rape seedlings, convulsing period or early flowering period of 50-100g borax, 50kg water spraying, continuous spray 2-3 times.
Six, gray white leaves
Rape appears gray leaves, is a symbol of zinc deficiency. Its characteristic is that it starts from the leaf margin first, and the leaf color fades to grey and white, and then develops to the middle. The yellow and white irregular lesions appear on the leaf. The veins on both sides of the leaf vein remain green. The leaves with heavier bleaching in the middle and lower part turn over and the tip is overhanged. . To remedy the seedling period, 1.5kg of zinc sulfate and 30 to 40kg of dry fine soil can be used for mu. The adult stage can be sprayed with 0.3%-0.4% zinc sulfate solution 2-3 times, 50-80kg per mu.
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