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The general lack of rapeseed:
In the absence of nitrogen in nitrogen-deficient rapeseed, the leaves are yellowish, weak in growth, and the plants are short. In general, nitrogen deficiency and red leaves are prone to occur when drought and fertilizer are released.
Remedial measures: Apply 7.5 kg urea per acre, or 15-20 kg ammonium bicarbonate to 500-700 kg water.
Phosphorus-deficient rape plant lacks phosphorus, which grows slowly and dwarfs, leaves become smaller, leaves thicken, dark green or gray-green leaves, lack of luster. Petiole purple, purple veins spots or plaques. The leaves had q2-3 pieces less than normal plants, and the bolting was slow and the moss color was red.
Remedy: Apply 25-30 kg superphosphate per acre, or spray potassium dihydrogen phosphate 2-3 times on successive leaves.
The shortage of potassium in rapeseed begins with the old leaves and begins with the development of the heart leaf. It initially appears yellow spots, and the leaf tips and leaf margins gradually appear as "focal edges" and pale brown spots, and the leaves become thicker, harder, and more brittle. The organization was apparently "burned" and wilted. These tissues remain brown after they die.
Remedial measures: Apply 7.5-10 kg potassium chloride to 500-700 kg per acre or 100-150 kg of ash.
Boron-deficient rapeseeds have a large demand for boron fertilizer, but the amount of boron in the soil is less, so rape is most likely to lack boron. The boron-deficient plant roots ceased to grow, with no root hairs and lateral roots, some with small nodules, and the root bark turning brown. Purple patches or blue-purple patches appeared on the leaves, leaf margins were recurved, and rhizomes were enlarged. Boron deficiency during flowering will appear "flower but not real", which means that after flowering, there is no scarring.
Remedial measures: 150-200 grams of borax with 150-200 kilograms of water per acre, or 50-100 grams of borax, 50 kilograms of water per acre for foliar spraying in sunny afternoons.
Rape enters the early spring field tube stage, due to improper fertilization during planting and transplanting or lack of a certain nutrient elements in the soil, causing poor growth of rapeseed, if not promptly taken remedial measures, it will affect the yield.