What are the symptoms of rapeseed deficiency? Brassica napus belongs to the cruciferous cabbage variety, which can be planted all year round. Because it is rich in various nutrients, especially calcium, it is especially suitable for the elderly who are deficient in calcium. Therefore, Xiaobian will take you to understand some rape shortages. Symptoms of the symptoms and remedies after deficiency.
ã€K-deficiency syndrome】
First, the symptoms of potassium deficiency
If there is a lack of potassium in rapeseed planting, it will seriously affect the growth and development, reduce the yield and quality of rapeseed, and the plants lacking potassium will gradually become wilted. Some veins of the seedlings will be convex upwards, the leaves will bend in a bow shape, and the leaves of rapeseed will appear dark blue green and the edges of the leaves. At the place or the veins are chlorotic, the spots on the leaves are gradually enlarged by the size of the sesame, and the plaque is necrotic. The serious leaves will not fall off but die. Compared with the normal potassium supply, the potassium-deficient rapeseed seedlings are released to ten. The leaf period will be delayed by one week, while the bud period will be postponed for twenty days. Plants with severe potassium deficiency will begin to die after flowering.
Second, potassium deficiency remedies
If there is a lack of potassium in the early stage, 7 to 10 kg of potassium chloride or 75 to 100 kg of grass ash per acre is used for trenching, and in the later stage, it can be sprayed with 0.1% to 0.2% potassium dihydrogen phosphate solution.
[nitrogen deficiency]
First, the symptoms of nitrogen deficiency
When the rapeseed plants are deficient in nitrogen, the plants are not only weak, but the leaves are few and small, the color gradually changes from yellow-green to yellow, and there will be redness at the edge of the lower leaves of the stems, and will expand to the veins, and the yield of rapeseed will also decrease. .
Second, the nitrite deficiency measures
In the early stage of nitrogen deficiency, 15 to 25 kg of ammonium bicarbonate per acre is used for trenching. It can also be applied with 750-1000 kg of human excrement and water; in the later stage, it is sprayed with 1% to 2% urea solution.
ã€Phosphorus deficiency】
First, the symptoms of deficiency of phosphorus
When rapeseed is deficient in phosphorus, the plant not only grows slowly but also is short, the leafing time is delayed, the leaf surface volume is dark green and dull, purple-red spots or plaques appear at the edges, and the petioles and leaf veins on the back of the leaves will It turns purple-red; the roots grow weakly and the emergence rate decreases.
Second, remedy for deficiency of phosphorus
In the early stage, phosphorus deficiency is used. 25 to 30 kg of superphosphate is used for trenching or water application per acre. The earlier the effect is better, the later use of 1% superphosphate leaching solution.
ã€Magnesium deficiency】
First, the symptoms of magnesium deficiency symptoms
When the rapeseed plants are deficient in magnesium, there will be yellow-purple and green-purple spots on the leaves.
Second, magnesium deficiency remedies
Once the rapeseed plants are found to be deficient in magnesium, they should be sprayed with l% to 2% magnesium sulfate solution in time.
[Sulphur deficiency]
First, the symptoms of sulphur deficiency
The rapeseed plants are short, the color is pale green, and there are large nicks on the edge of the leaves, showing a cupped shape, and the leaves, veins and stems become purple.
Second, sulfur deficiency remedies
By applying cultivating 1-2kg of sulfur powder per mu of land, 50kg of gypsum powder can also be used, and an appropriate amount of sulfur-containing fertilizer such as ammonium sulfate can be added, which can have a very obvious remedial effect.
ã€Manganese deficiency】
First, the symptoms of manganese deficiency
The rapeseed plants are short and have chlorosis, yellow and white leaves, green veins and weak stem growth.
Second, remedy for manganese deficiency
Once the occurrence of manganese deficiency in rapeseed plants is found, it should be sprayed with 0.1% to 0.2% manganese sulfate solution in time.
ã€Zinc deficiency syndrome】
First, the symptoms of zinc deficiency symptoms
The color of the edge of the leaves fades to grayish white, and then gradually develops toward the middle of the leaves. The leaves appear yellow patches, and the whitened heavier leaves in the lower part of the diseased leaves turn outwards, and the tip of the leaves drapes.
Second, zinc deficiency remedies
In the initial stage, 0.5 to 0.75 kg of zinc sulphate was used for trenching per acre, and the 0.2% zinc sulphate solution was sprayed at the later stage.
ã€Molybdenum deficiency】
First, the symptoms of molybdenum deficiency
The leaves of rapeseed are withered or scorched, and the leaves are spirally twisted. After the old leaves are changed, the plants around the rapeseed are clustered.
Second, remedy for molybdenum deficiency
Timely spray with 0.01% to 0.1% ammonium molybdate solution.
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