Rapeseed is a crop that requires a large amount of fertilizer, often due to inadequate fertilization or improper fertilization, resulting in plant growth retardation, resulting in serious reduction in production. Therefore, we should pay attention to observing the color change of rape leaf in peacetime, grasping the causes, timely remedy, and recover the loss.
The main symptoms of nitrogen deficiency in nitrogen-deficient rapeseeds were: reddish leaves, chlorophyll disappeared, and the new chlorophyll could not be formed, showing a reddish purple color; the leaves of rapeseed rape were pale yellow; the leaves of mustard rape were purple. Remedy: Within 1 to 3 days after the occurrence of the above symptoms, increase ammonium bicarbonate by 7.5 to 12.5 kg or 2.5 to 5 kg of urea per acre.
The main symptoms of phosphorus deficiency in phosphorus-deficient rapeseeds are poor root development, smaller leaves, thicker leaves, darker green leaves, and lack of luster. Remedy: After the above symptoms of rape, apply 4 to 5 kg of calcium phosphate per acre in time.
The main symptoms of potassium deficiency in rapeseed rape are as follows: The potassium deficiency in rape usually occurs in the middle and late stages, and the leaves and petioles are purple, and the leaf margins can be seen as charred and brown spots. In severe cases, the development stage can be delayed and the yield can be reduced by 30% to 50%. Remedy: After the occurrence of the above symptoms, apply 5 to 7.5 kg of potassium chloride per acre, about 200 kg of vegetation ash, or spray 40 kg of potassium chloride solution at a concentration of 0.1% to 0.15% per acre.
Lack of boron in boron-deficient rapeseed can cause "flower failure", resulting in severe reductions in production and quality. The main symptoms of boron deficiency: the leaves are purple or blue-purple, and the leaves are thickened; the buds turn green and turn yellow and shrink and fall off. Remedy: After symptoms appear, spray 100-300 g of borax and 20-25 kg of water per acre.
The main symptoms of nitrogen deficiency in nitrogen-deficient rapeseeds were: reddish leaves, chlorophyll disappeared, and the new chlorophyll could not be formed, showing a reddish purple color; the leaves of rapeseed rape were pale yellow; the leaves of mustard rape were purple. Remedy: Within 1 to 3 days after the occurrence of the above symptoms, increase ammonium bicarbonate by 7.5 to 12.5 kg or 2.5 to 5 kg of urea per acre.
The main symptoms of phosphorus deficiency in phosphorus-deficient rapeseeds are poor root development, smaller leaves, thicker leaves, darker green leaves, and lack of luster. Remedy: After the above symptoms of rape, apply 4 to 5 kg of calcium phosphate per acre in time.
The main symptoms of potassium deficiency in rapeseed rape are as follows: The potassium deficiency in rape usually occurs in the middle and late stages, and the leaves and petioles are purple, and the leaf margins can be seen as charred and brown spots. In severe cases, the development stage can be delayed and the yield can be reduced by 30% to 50%. Remedy: After the occurrence of the above symptoms, apply 5 to 7.5 kg of potassium chloride per acre, about 200 kg of vegetation ash, or spray 40 kg of potassium chloride solution at a concentration of 0.1% to 0.15% per acre.
Lack of boron in boron-deficient rapeseed can cause "flower failure", resulting in severe reductions in production and quality. The main symptoms of boron deficiency: the leaves are purple or blue-purple, and the leaves are thickened; the buds turn green and turn yellow and shrink and fall off. Remedy: After symptoms appear, spray 100-300 g of borax and 20-25 kg of water per acre.
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