Seedlings of rapeseed red and yellow
Rapeseed seedlings often appear two kinds of abnormal red or yellow leaves, red and yellow seedlings need to see the concept of "disease", symptomatic treatment, in order to transform in time.
Dry red leaves: Rape seedlings, if the long-term drought does not rain, or lack of soil moisture, rape due to lack of water to grow slowly, the plants dwarf, pale red leaves. In this regard, it is necessary to conduct furrow irrigation and drought relief in time, and combine topdressing with fertilizers before winter to promote the conversion of rapeseed to normal growth.
Stained red leaves: too much rain before the winter, poor drainage caused by soil waterlogging, poor absorption and the formation of fresh seedlings, dark red leaves. For the waterlogged red leaf, a high standard should be used to open a good three ditch, and clear the ditch in time to eliminate waterlogging, lower the groundwater level, and eliminate waterlogging. At the same time, it is necessary to cultivate cultivating soil in a timely manner, increase the temperature, and promote the growth of roots.
Infestation of red leaves: When the larvae of the seedling stage are seriously damaged, they cause redness of the rape leaves and atrophy. For the redness of leaves caused by aphid damage, promptly use large agents, flutters, and other net agents to kill and promote the recovery of rape.
Frost damage red leaves: In case of abrupt changes in the weather at the seedling stage, the temperature drops sharply and the leaves become red due to freezing. This should be combined with cultivator roots, 50 to 75 kilograms per mu of grass ash, or spraying 0.3% of potassium dihydrogen phosphate solution, can reduce the freezing damage.
Fat red leaves: rape lack of fat, will show different symptoms of red leaves. If the phosphorus deficiency is purple, the potassium deficiency is brownish red, the boron deficiency is purple, and the leaf margin is rewinded. For red leaf seedlings caused by phosphorus deficiency or potassium deficiency, appropriate phosphorus and potassium fertilizers may be topdressed, or 0.2% to 0.3% of potassium dihydrogen phosphate solution may be sprayed on the leaves. For boron seedlings caused by boron deficiency, spray 0.2% borax solution twice, or use 500 to 750 grams of borax per acre in combination with replenishing water.
Yellow leaf lack of fertilizer: nitrogen deficiency in seedling stage, plant dwarf, leaf color faded green yellow, old leaves yellowish red. Seedlings are deficient in zinc and their plants are dwarf. The new leaves are yellowish-white in color. The rapeseed lacks sulfur at the seedling stage, the plants are pale green, the leaves chlorosis yellow, and the leaves are small and small. For nitrogen-deficient yellow seedlings, suitable amount of available nitrogen fertilizer can be traced. For yellow leaf seedlings caused by zinc deficiency, spray 0.1% to 0.2% zinc sulfate solution twice. Yellow leaf seedlings caused by sulfur deficiency can be combined with 10 kg of gypsum powder per acre.
Yellow leaf disease: Rapeseed infected with virus disease, leaf curling, shrinking, uneven green and yellow. Cabbage-type rape formed yellow and green stripes after the onset. After the onset of Brassica napus L., yellow-brown spots appeared on the leaves. If yellow leaves occur due to a viral disease, the central disease strain must be removed in time to reduce the source of the disease. At the same time the use of drugs to eliminate fleas, control of disease, can be used virus A, a net (or big hero, four seasons red, etc.) plus 500 times the vinegar mixed solution spray.
Sour yellow leaves: Planting rapeseed in a more acidic soil can cause acid damage and yellow leaves. This yellow leaf is generally not dead, but it is easy to fall off. In this regard, 100 kg of plant ash or 50 kg of lime can be topped off per acre to reduce the acidity and alkalinity of the soil and eliminate acid hazards.
Dry red leaves: Rape seedlings, if the long-term drought does not rain, or lack of soil moisture, rape due to lack of water to grow slowly, the plants dwarf, pale red leaves. In this regard, it is necessary to conduct furrow irrigation and drought relief in time, and combine topdressing with fertilizers before winter to promote the conversion of rapeseed to normal growth.
Stained red leaves: too much rain before the winter, poor drainage caused by soil waterlogging, poor absorption and the formation of fresh seedlings, dark red leaves. For the waterlogged red leaf, a high standard should be used to open a good three ditch, and clear the ditch in time to eliminate waterlogging, lower the groundwater level, and eliminate waterlogging. At the same time, it is necessary to cultivate cultivating soil in a timely manner, increase the temperature, and promote the growth of roots.
Infestation of red leaves: When the larvae of the seedling stage are seriously damaged, they cause redness of the rape leaves and atrophy. For the redness of leaves caused by aphid damage, promptly use large agents, flutters, and other net agents to kill and promote the recovery of rape.
Frost damage red leaves: In case of abrupt changes in the weather at the seedling stage, the temperature drops sharply and the leaves become red due to freezing. This should be combined with cultivator roots, 50 to 75 kilograms per mu of grass ash, or spraying 0.3% of potassium dihydrogen phosphate solution, can reduce the freezing damage.
Fat red leaves: rape lack of fat, will show different symptoms of red leaves. If the phosphorus deficiency is purple, the potassium deficiency is brownish red, the boron deficiency is purple, and the leaf margin is rewinded. For red leaf seedlings caused by phosphorus deficiency or potassium deficiency, appropriate phosphorus and potassium fertilizers may be topdressed, or 0.2% to 0.3% of potassium dihydrogen phosphate solution may be sprayed on the leaves. For boron seedlings caused by boron deficiency, spray 0.2% borax solution twice, or use 500 to 750 grams of borax per acre in combination with replenishing water.
Yellow leaf lack of fertilizer: nitrogen deficiency in seedling stage, plant dwarf, leaf color faded green yellow, old leaves yellowish red. Seedlings are deficient in zinc and their plants are dwarf. The new leaves are yellowish-white in color. The rapeseed lacks sulfur at the seedling stage, the plants are pale green, the leaves chlorosis yellow, and the leaves are small and small. For nitrogen-deficient yellow seedlings, suitable amount of available nitrogen fertilizer can be traced. For yellow leaf seedlings caused by zinc deficiency, spray 0.1% to 0.2% zinc sulfate solution twice. Yellow leaf seedlings caused by sulfur deficiency can be combined with 10 kg of gypsum powder per acre.
Yellow leaf disease: Rapeseed infected with virus disease, leaf curling, shrinking, uneven green and yellow. Cabbage-type rape formed yellow and green stripes after the onset. After the onset of Brassica napus L., yellow-brown spots appeared on the leaves. If yellow leaves occur due to a viral disease, the central disease strain must be removed in time to reduce the source of the disease. At the same time the use of drugs to eliminate fleas, control of disease, can be used virus A, a net (or big hero, four seasons red, etc.) plus 500 times the vinegar mixed solution spray.
Sour yellow leaves: Planting rapeseed in a more acidic soil can cause acid damage and yellow leaves. This yellow leaf is generally not dead, but it is easy to fall off. In this regard, 100 kg of plant ash or 50 kg of lime can be topped off per acre to reduce the acidity and alkalinity of the soil and eliminate acid hazards.
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