The 16 nutrients necessary for plant growth, although the crops require different amounts of them, their physiological functions in the process of crop growth and development are equally important and irreplaceable. When a certain element is too much or lacking, a series of metabolic activities in the crop body will be hindered. When severe, a special morbid state will appear on the appearance. This kind of physiological morbidity caused by malnutrition is called deficiency syndrome. . The diagnosis of morphological diagnosis of deficiencies mainly depends on the appearance of the crops. The deficiency syndrome can be identified from the roots, stems, leaves, flowers, fruits and seeds of crops. Identification is generally divided into three steps. 1, see the symptoms of the site If the symptoms first appear on the old leaves, it shows that the lack of nitrogen, phosphorus, potassium, magnesium (zinc). Because these elements are reusable in crops, when they are scarce, they can be transferred from the lower old leaves to the upper new leaves and reused. The deficiency of the elements is often manifested first in the lower old leaves. If the symptoms first appear in the newborn tissue, it means that calcium, iron, boron, sulfur, etc. are lacking. Because these elements have poor mobility in the crop, they do not have the ability to use it again. Therefore, in the absence of symptoms, the symptoms are most likely to be found in the upper neonatal tissues (eg, Seedlings, young leaves) appear on it. 2, to see if the old leaves have spots, whether the new leaves are dry In the case of symptomatic symptoms in the old leaves, there is no sickness class, which may be phosphorus deficiency or nitrogen deficiency; if there is a lesion, it may be potassium deficiency or zinc deficiency. If the symptoms start from the new leaves, if the terminal buds are easy to die, it may be boron or calcium deficiency; when the buds are not easy to die, they may be iron deficiency, sulfur, manganese, molybdenum, and copper. 3, determine the lack of elements based on specific symptoms (1) Nitrogen deficiency and nitrogen deficiency occur first in the middle and lower old leaves. The content of protein and chlorophyll in the diseased leaves is reduced, and the leaf color is light green and yellow, and the leaves are thin and soft, and the flowers and fruits are few and easy to fall off. Usually sprayed with urea 1~1.5%, (but the biuret content can not exceed 2%) is best after 4 pm, due to less transpiration, leaf surface stomata, rapid absorption, 5 hours to absorb 40 to 50 %, absorb 60 to 70% in 24 hours. (2) Phosphorus-deficient old leaves or functional leaves occur first. The diseased leaves are dark green, and the leaves and stems often accumulate more anthocyanins and become purple. Phosphorus deficiency leads to impeded cell division, delayed seed and fruit maturation, imperfect seeds and poor root growth, and small leaves. Usually 2 to 3% of superphosphate (water is allowed to stand for 24 hours to take a clear solution). (3) Potassium-deficient potassium is highly mobile in plants. Therefore, potassium deficiency first occurs in functional leaves, the boundary between lesions is clear, and rust-colored spots appear on rice; yellow tip of old wheat leaves and edges are yellow coke; cotton or dicotyledonous crops Yellow leaf spots occur in the mesophyll, after which the plaques rise, the leaves thicken, the hair becomes brittle, and the macular brown necrosis occurs. Use 0.2 to 0.3% of potassium dihydrogen phosphate or 1 to 1.5% of potassium sulfate or use 5 to 7% of ash (add water and stir, and let stand for 15 hours to filter and reuse). (4) Sulphur-deficient sulphur is not easy to move in the plant. When young, the young leaves first develop disease. The leaf veins and mesophylls lack green color, and the leaves are light in color and generally do not appear white. Seen from the absence of green veins, it can be distinguished from general chlorosis. (5) The young organs at the top of the calcium deficiency are first attacked, and the bud tips die first. The diseased leaves were pale green, and then the tips of the leaves were hooked downwards and gradually withered. Lateral roots are thick. (6) Lack of greening and yellowing of magnesium leaf mesophyll generally does not have necrotic spots. The difference from nitrogen deficiency is the yellowing of leaf and the veins are still green. (7) Iron deficiency symptoms first appear on the top young leaves. At the beginning of the general period, the young leaves lack green, the veins remain green, and the mesophyll yellows or whites, but there are no brown necrotic spots, and the veins also become green afterwards. Use 0.2 to 1% of ferrous sulfate and ferrous ammonium sulfate. (8) Boron-boron deficiency occurs when the top young tissue first develops. The apical buds stop growing and gradually wither; the leaves are dark green or purple, and the leaf shape is smaller, the leaves are thicker, crumpled, and the plants are dwarfed. The lack of boron in crops such as cotton, rapeseed, and soybeans can occur without flowering and flowering. The lack of boron in wheat also causes “spike and not realismâ€. The dark green ring on the petiole is a unique symptom of cotton deficiency. Use 0.2 to 0.3% borax or boric acid. (9) Manganese-deficient manganese deficiency occurs at the top of young leaves. In broad-leaved dicotyledonous crops such as cotton, the mesophyll lacks green, yellow spots and necrosis occur, but the veins remain green; branching and flowering of rape are inhibited; in monocotyledonous crops such as rice, gray or brown spots first appear on the leaves, and the spots gradually follow Vein veins are linked into strips and called brown stripe verticillium wilt. (10) Copper deficiency and copper deficiency at the top of the young leaves are initially greenish. Gramineous crops turn white in their tips, large and wheat are curved, their edges are grayish yellow, and their heading is difficult. (11) Zinc deficiency deficiencies are mostly stalk dwarfs, with small, clustered leaves and yellow spots on the leaves. Therefore, they are also referred to as lobular disease or variegated leaf disease. Use 0.1 to 0.2% zinc sulfate. (12) The general symptom of molybdenum-deficient molybdenum deficiency is chlorosis of the leaves. The site of chlorosis is located between the veins of the leaves, forming yellow-green or orange-red spots. Use 0.05 to 0.1% ammonium molybdate. Cilastatin Acid,Imipenem Cilastatin,Cilastatin Intermediate,Imipenem Cilastatin Cost Xinxiang Haibin Pharmaceutical Co.,Ltd , https://www.carbapenemspharmacy.com