1. Nitrogen deficiency: When the nitrogen is insufficient, the growth of the flower is hindered, the growth amount drops greatly, the color becomes shallow at the beginning, then the yellowing falls off, and the signs of necrosis generally do not appear. The symptoms of lack of green always start from the old leaves and grow on the new leaves. When the nitrogen is deficient, the branches are pressed. In the absence of nitrogen, stems and petioles often become purplish red due to the accumulation of sugar in the tissue to promote the synthesis of anthocyanins. NINGBO DURREX PUMPS CO.,LTD , https://www.durrexlobepump.com
2. Phosphorus deficiency: Phosphorus has a strong ability to move in plants and can be rapidly transferred from old leaves to young shoots and meristems. Therefore, the symptoms of phosphorus deficiency first appear on the old leaves. When the flowers are deficient in phosphorus, the leaves are dark green. Due to the accumulation of soluble sugars during the phosphorus deficiency, the anthocyanins are formed, and the stems and stems become purple. In the case of severe phosphorus deficiency, necrotic areas will appear in all parts of the plant. In the absence of phosphorus, it also grows in the growth of alfalfa, but it is not as severe as in the absence of nitrogen. But the growth of the roots is more than the lack of nitrogen.
3. Potassium deficiency: Potassium has a high degree of mobility in plants. When plants are deficient in potassium, they first appear on the old leaves. In the absence of potassium, the leaves appear in the green area of ​​the barge, and then the necrotic area is produced along the leaf edge and the tip of the leaf. The leaves are curled and finally blackened and burnt; the growth of the stem is weakened and the disease resistance is reduced.
4. Calcium deficiency: Because calcium has poor mobility in plants, the symptoms of calcium deficiency in plants first appear on new leaves at this moment. The typical symptoms of calcium deficiency are necrosis of leaf tips and leaf margins of young leaves, followed by buds. Necrosis, the apex also inhibits growth, discoloration and death.
5, lack of magnesium: the typical symptoms are lack of green between the leaves and stems, sometimes appearing red, orange and other bright brilliance, in serious cases of small planes or large necrosis on the surface of the object. Since magnesium is easy to flow in plants, symptoms of magnesium deficiency usually occur on old leaves. Magnesium deficiency is also likely to occur when potassium is used in large quantities.
6. Sulphur deficiency: The symptoms of sulphur deficiency are similar to those of nitrogen deficiency, such as the symmetry of green leaves and yellowing of leaves, the formation and accumulation of anthocyanins, and the growth of sputum. However, sulfur deficiency usually begins with young leaves and is less severe.
7, iron deficiency: the typical symptoms are lack of green. Iron can not move in the body of plants, so the lack of iron first shows the young leaves at this moment. The green deficiency of iron deficiency is characterized by yellowing between the stems and stems, and the stems can still connect with green color. Generally, there is no sign of sputum or necrosis. Plants are often deficient in iron in alkaline soils or white-gray calcareous soils because of the presence of insoluble iron oxide or iron hydroxide in the soil under alkaline conditions. Excessive magnesium in the soil also affects the absorption of iron. Although iron can be absorbed by plants in the state of Fe3+, it is necessary to reduce the psychologically active Fe2+ state in plants. Manganese is an oxidant, and the manganese/iron ratio is unbalanced. The special condition causes iron to exist in the state of Fe3+ and loses its psychological activity.
8. Zinc deficiency: The typical symptom of zinc deficiency is that the growth of internodes is affected by sputum, the leaves are severely deformed, and the top wind is pressed, which is mostly caused by insufficient supply of auxin (IAA), because zinc and zinc are necessary for auxin synthesis. The lack of green leaves is also a common symptom of zinc deficiency. Symptoms of zinc deficiency are more likely to occur on neutral and alkaline soils. Zinc deficiency in many areas of China's soils affects crop yields, and the yield of the plants involved is affected. At the same time, due to the long-term consumption of zinc-deficient foods by local people, it also affects people's health. In the application of zinc fertilizer, the problem of antagonism of zinc and phosphorus is often encountered. Zinc fertilizer is generally used as a better effect on root dressing, which can prevent zinc-phosphorus antagonism.
9. Boron deficiency: The typical symptoms of boron deficiency are thickening of the leaves and darkening of the leaves. The apical meristems of the branches and roots die, and the development of boron deficiency is blocked and the development of the branches is slow. The growth of boron deficiency is slow, the soil The effectiveness of boron in the medium is affected by calcium. The high content of calcium in the soil can reduce the absorption of boron. The reason is that calcium causes the boron to recombine or precipitate in the soil, or reduce the absorption capacity of boron by the root system.
10. Manganese deficiency: The symptoms of manganese deficiency are green leaves, and small necrotic spots are formed on the leaves. Note that it is different from cocci spot disease and brown spot disease. The symptoms of manganese deficiency are on young leaves and old leaves. Can happen. Generally, manganese is not deficient in acidic soil, but in soils with a pH greater than 6.5, manganese deficiency is often caused. In soils with high oxidization and alkaline soils, manganese and iron can be converted into inactive states, causing plants to be deficient in manganese. Plant yields are affected when the manganese content is too high and too low.
11. Copper deficiency: The symptoms of copper deficiency are leaf tip necrosis and leaf wilting and blackening, and the symptoms first appear on young leaves. When the soil is applied more than a limited amount of phosphate fertilizer, copper will become an insoluble precipitate and reduce the effectiveness. The application of copper sulfate to edible plants can increase the yield and improve disease resistance.
12, lack of molybdenum: the initial symptoms of deficiency of molybdenum are the lack of green and necrosis between the old leaves, sometimes spotted necrosis. Molybdenum deficiency can also cause symptoms of nitrogen deficiency. It is easily absorbed by plants in soils with higher pH.
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