For rapeseed deficiency, it is necessary to take precautions. Once symptoms appear, it is necessary to take remedial measures immediately.
1. Nitrogen deficiency When rapeseed is deficient in nitrogen, the leaves are yellow, the growth is weak, and the plants are short. Generally, nitrogen deficiency and red leaves are likely to occur during drought and de-fertilization. Remedy: Apply 7.5 kg of urea or 15 to 20 kg of ammonium bicarbonate per 667 square meters (1 mu) to 500-750 kg of water.
2. Phosphorus-deficient rapeseed plants are slow and short in growth, the leaves become smaller, the leaf flesh becomes thicker, the leaves are dark green or grayish green, and lack luster. Petiole purple, purple veins or plaques on the edge of veins. The number of leaves is 2 to 3 less than that of normal plants, and the twitching is slow, and the tinge is red. Remedy: Apply 25-30 kg of superphosphate per 667 square meters or spray the potassium dihydrogen phosphate 2~3 times continuously.
3. Potassium deficiency The potassium deficiency of rapeseed begins with the old leaves and develops toward the heart leaf. It initially shows yellow spots, and the "focal edge" and pale brown spots appear gradually at the tip and leaf edge. The leaves become thicker, harder and more brittle, and the mesophyll tissue is obviously "scalded, followed by wilting. These tissues remain brown after death. Remedial measures: 7.5 to 10 kg of potassium chloride per 500 667 square meters to water 500 ~ 750 kg of pouring, or mixed with 100 ~ 150 kg of grass ash.
4. Boron deficiency Brassica oil has a large demand for boron fertilizer, but the soil contains less boron, so rapeseed is most likely to be deficient in boron. The roots of the boron-deficient plants stopped growing, no root hairs and lateral roots, and some had small tumor-like protrusions at the root end, and the root bark became brown. Purple plaques or blue-violet plaques appear in the leaves, the leaf margins are rewinded, and the rhizome is enlarged. Boron deficiency in the flowering period will appear "flowers and not real", that is, the phenomenon of no pods after flowering. Remedy: 150 to 200 kilograms of water per 150 square meters of borax per 100 to 200 kilograms, or 50 to 100 grams of borax to 50 kilograms of water for sunny afternoon foliage.
1. Nitrogen deficiency When rapeseed is deficient in nitrogen, the leaves are yellow, the growth is weak, and the plants are short. Generally, nitrogen deficiency and red leaves are likely to occur during drought and de-fertilization. Remedy: Apply 7.5 kg of urea or 15 to 20 kg of ammonium bicarbonate per 667 square meters (1 mu) to 500-750 kg of water.
2. Phosphorus-deficient rapeseed plants are slow and short in growth, the leaves become smaller, the leaf flesh becomes thicker, the leaves are dark green or grayish green, and lack luster. Petiole purple, purple veins or plaques on the edge of veins. The number of leaves is 2 to 3 less than that of normal plants, and the twitching is slow, and the tinge is red. Remedy: Apply 25-30 kg of superphosphate per 667 square meters or spray the potassium dihydrogen phosphate 2~3 times continuously.
3. Potassium deficiency The potassium deficiency of rapeseed begins with the old leaves and develops toward the heart leaf. It initially shows yellow spots, and the "focal edge" and pale brown spots appear gradually at the tip and leaf edge. The leaves become thicker, harder and more brittle, and the mesophyll tissue is obviously "scalded, followed by wilting. These tissues remain brown after death. Remedial measures: 7.5 to 10 kg of potassium chloride per 500 667 square meters to water 500 ~ 750 kg of pouring, or mixed with 100 ~ 150 kg of grass ash.
4. Boron deficiency Brassica oil has a large demand for boron fertilizer, but the soil contains less boron, so rapeseed is most likely to be deficient in boron. The roots of the boron-deficient plants stopped growing, no root hairs and lateral roots, and some had small tumor-like protrusions at the root end, and the root bark became brown. Purple plaques or blue-violet plaques appear in the leaves, the leaf margins are rewinded, and the rhizome is enlarged. Boron deficiency in the flowering period will appear "flowers and not real", that is, the phenomenon of no pods after flowering. Remedy: 150 to 200 kilograms of water per 150 square meters of borax per 100 to 200 kilograms, or 50 to 100 grams of borax to 50 kilograms of water for sunny afternoon foliage.
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