I. Nitrogen deficiency The main symptoms of nitrogen deficiency in rapeseed are reddish leaves of Brassica napus L., chlorophyll disappeared, new chlorophyll could not form, showing reddish purple; leaves of Brassica napus L. were light yellow; whole leaves of Brassica napus were purple.
Remedy: Apply 7.5~12.5 kg of ammonium bicarbonate or 2.5-5 kg ​​of urea per acre within 1 to 3 days after the above symptoms occur.
Second, the lack of phosphorus The main symptoms of phosphorus deficiency in rapeseed are root dysplasia, the leaves become smaller, the leaf flesh becomes thicker, the leaves are dark green and dark, lacking luster.
Remedy: After the above symptoms appear in the rapeseed, apply 4 to 5 kg of calcium phosphate per acre in time.
III. Potassium deficiency The main symptoms of potassium deficiency in rapeseed are generally in the middle and late stages. The leaves and petioles are purple, and burnt and brown spots are visible on the leaf margins. In severe cases, the developmental stage can be postponed and the yield is reduced by 30% to 50%.
Remedial measures: The above symptoms occur 5 to 7.5 kg of potassium chloride per hectare, 200 kg of grass ash; or 40 kg of potassium chloride solution with a concentration of 0.1% to 0.15% per acre.
Fourth, the lack of boron Brassica oil shortage of boron will cause flowers and unreal, resulting in severe production and quality decline. The main symptoms of boron deficiency: the leaves are purplish red or blue-violet, the leaf flesh is thickened; the flower buds are chlorotic and yellow, atrophic and shedding.
Remedy: After the symptoms appear, use 100-300 grams of borax per acre plus 20-25 kg of foliar spray.
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