![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Rape is a crop with a large amount of fertilizer. As the multiple cropping index increases, it is often caused by poor fertilization or improper fertilization, resulting in slow growth of the plant, resulting in severe yield reduction. If we pay attention to observing the color of rape leaves, and grasping the reasons, we can achieve high yield and stable yield in time. The following are the main symptoms and remedies for rapeseed deficiency:
1. Lack of nitrogen. The main symptoms of nitrogen deficiency: the leaves of Brassica napus turn red, the chlorophyll disappears, the new chlorophyll can not form, showing purple; the cabbage rape is light yellow; the whole leaf of mustard is purple. Remedy: Apply 7.5-12.5 kg of ammonium bicarbonate or 2.5-5 kg ​​of urea per 667 m 2 within 1-3 days after the above symptoms occur. The accumulation of nitrogen in rape plants is greatly affected by fertilization. The accumulation of nitrogen in the rapeseed with a large amount of fertilization will stop absorption prematurely, and will no longer absorb nitrogen during the full bloom period, thus reducing the yield and quality. However, when the amount of fertilization is small, the nitrogen will be absorbed in the pod during the development period. Therefore, it is necessary to apply nitrogen fertilizer.
2. Phosphorus deficiency. The main symptoms of phosphorus deficiency: root dysplasia, small leaves, thick leaves, dark green and dark leaves, lack of luster. Remedy: Rape is sensitive to phosphorus, but has a special phosphorus absorption function. Due to the urgent demand for phosphorus in the early stage of rapeseed (especially in the seedling stage), the effect of phosphorus application in the later stage is not obvious. After the above symptoms are found in the rape field, 4-5 kg ​​of calcium phosphate should be applied every 667 m2 in time.
3. The main symptoms of potassium deficiency and potassium deficiency: Potassium deficiency in rapeseed generally occurs in the middle and late stages. When potassium is deficient, the leaves and petioles are purple, and then “burnt†and light brown spots are visible on the leaf margin. Delayed development in severe cases, reducing yield by 30% -50%. Remedy: After the above symptoms, apply potassium chloride 5-7.5 kg per 667 m2, about 200 kg of plant ash; or spray 40 kg of 0.1%-0.15% potassium chloride solution per 667 m2.
4, the main symptoms of boron deficiency, boron deficiency: leaf color dark green, leaf flesh thickening late, leaves are purple red or blue purple. The flower buds are chlorotic, yellow, atrophic, dry or shed. Remedy: When this symptom is found, use 100-300 g borax plus 20-25 kg of foliar spray per 667 m2.
1. Lack of nitrogen. The main symptoms of nitrogen deficiency: the leaves of Brassica napus turn red, the chlorophyll disappears, the new chlorophyll can not form, showing purple; the cabbage rape is light yellow; the whole leaf of mustard is purple. Remedy: Apply 7.5-12.5 kg of ammonium bicarbonate or 2.5-5 kg ​​of urea per 667 m 2 within 1-3 days after the above symptoms occur. The accumulation of nitrogen in rape plants is greatly affected by fertilization. The accumulation of nitrogen in the rapeseed with a large amount of fertilization will stop absorption prematurely, and will no longer absorb nitrogen during the full bloom period, thus reducing the yield and quality. However, when the amount of fertilization is small, the nitrogen will be absorbed in the pod during the development period. Therefore, it is necessary to apply nitrogen fertilizer.
2. Phosphorus deficiency. The main symptoms of phosphorus deficiency: root dysplasia, small leaves, thick leaves, dark green and dark leaves, lack of luster. Remedy: Rape is sensitive to phosphorus, but has a special phosphorus absorption function. Due to the urgent demand for phosphorus in the early stage of rapeseed (especially in the seedling stage), the effect of phosphorus application in the later stage is not obvious. After the above symptoms are found in the rape field, 4-5 kg ​​of calcium phosphate should be applied every 667 m2 in time.
3. The main symptoms of potassium deficiency and potassium deficiency: Potassium deficiency in rapeseed generally occurs in the middle and late stages. When potassium is deficient, the leaves and petioles are purple, and then “burnt†and light brown spots are visible on the leaf margin. Delayed development in severe cases, reducing yield by 30% -50%. Remedy: After the above symptoms, apply potassium chloride 5-7.5 kg per 667 m2, about 200 kg of plant ash; or spray 40 kg of 0.1%-0.15% potassium chloride solution per 667 m2.
4, the main symptoms of boron deficiency, boron deficiency: leaf color dark green, leaf flesh thickening late, leaves are purple red or blue purple. The flower buds are chlorotic, yellow, atrophic, dry or shed. Remedy: When this symptom is found, use 100-300 g borax plus 20-25 kg of foliar spray per 667 m2.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Fenghua Jade Motor Co., Ltd. , http://www.aerosolmp.com