When nitrogen-deficient rapeseed is deficient in nitrogen, the leaves are yellow, the growth is weak, and the plants are short. Generally, nitrogen-deficient red leaves are prone to occur during drought and de-fertilization.
Remedy: Apply 7.5 kg of urea per acre, or apply 15 to 20 kg of ammonium bicarbonate to 500-700 kg of water.
The phosphorus-deficient rapeseed plants are deficient in phosphorus, the growth is slow and short, the leaves become smaller, the leaf flesh becomes thicker, the leaves are dark green or grayish green, and the luster is lacking. Petiole purple, purple veins or plaques on the edge of veins. The leaves are 2~3 less than the normal plants, the convulsions are slow, and the tinge is red.
Remedy: Apply 25~30 kg of superphosphate per acre, or spray 2 or 3 times of potassium dihydrogen phosphate on continuous leaves.
Potassium deficiency in potassium-deficient rape begins with the old leaves, and then develops toward the heart leaves. It initially appears yellow spots, and the leaves and leaves gradually appear "focal edges" and pale brown spots. The leaves become thicker, harder and brittle. The tissue was markedly "scalded" and then wilted. These tissues still retain brown after they die.
Remedy: Apply 7.5~10kg of potassium chloride per acre to 500~700kg of water, or mix it with 100~150kg of ash.
Boron-poor rape has a large demand for boron fertilizer, but the amount of boron in the soil is less, so rape is most likely to be deficient in boron. The roots of boron-deficient plants stopped growing, without root hairs and lateral roots, and some had small knob-like protrusions at the root end, and the root bark became brown. Purple plaques or blue-purple plaques appear in the leaves, the leaf margins are reversed, and the rhizome is enlarged. Boron deficiency in the flowering period will appear "flowers and not real", that is, no pods after flowering.
Remedy: 150 to 200 grams of borax per acre to 150 to 200 kilograms of water, or 50 to 100 grams of borax to 50 kilograms of water to choose sunny afternoon afternoon foliage.
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