Crop nutrient characteristics
Nitrogen deficiency: Plant growth was inhibited and the above ground was significantly more affected than in the ground. Symptoms usually start from the old leaves and gradually expand to the upper leaves, the lower leaves are evenly chlorotic, yellowish and fall off early in severe cases; the roots are whiter and longer than the normal, but the roots are small; the number of flowers and fruits is small and prone to premature aging, The seeds are mature in advance and the seeds are small but not full, which significantly affects the yield and quality of the crops.
Phosphorus deficient: Plants grow slowly, dwarf, thin, erect, with less branches, delay mature, seeds are not full or the fruit is small. The leaves of the plants are small, the leaves are dark green, dull or purple, and the leaves are dead and fall off when the phosphorus is severely deficient. The appearance of symptoms generally starts from the old leaves of the base of the stem and gradually develops upward. In mildly deficient conditions, the symptoms are not obvious. They only affect the yield and quality of the crops. In moderate to severe shortages, there are obvious symptoms. Cereal crops lack phosphorus, showing dark green leaves and stems. Plants have little or no tillering. Plants don't spread apart. Their length is similar to "one column of incense." Delayed heading, flowering and maturation, less grains and less plump roots, and roots Aging is rusty, less white roots.
Potassium Deficiency: The main feature of potassium deficiency is usually the yellowing of the old leaves and leaf margins, which then turn brown. The coke is burning and brown spots or patches appear on the leaves, but remain green in the middle and near the leaf veins. The degree of potassium deficiency is aggravated, and the entire leaf becomes reddish-brown or dry, with necrotic shedding. The root system is short and small, prone to premature aging, and when it is severe, it rots, causing the crop to produce roots lodging. When the cereal crops lack potassium, brown spots appear in the lower leaves. In severe cases, the same symptoms occur in the upper new leaves. The leaves were covered with softness, the stems were thin, the internodes were short, and the length of the leaves did not change significantly. The spike rate was low, heading was irregular, the seed setting rate was poor, the spike shape was small, and the grain was not full.
Sulfur deficiency: The symptoms of sulfur deficiency are similar to the symptoms of nitrogen deficiency. The chlorosis and yellowing are obvious. However, this kind of chlorosis is different from nitrogen deficiency. In particular, the sulfur deficiency of dicotyledonous plants, the chlorosis and yellowing of the leaves at the top of the plants were more pronounced than the old leaves, and purple-red patches sometimes appeared. In extreme shortage, brown spots also appear. The general symptoms are short plants, small leaves, upward curled leaves, hardened, brittle, and early shedding. Stem growth was retarded, stiffened, and flowering was late with less fruiting and scarring.
Magnesium deficiency: The magnesium deficiency of crops shows obvious features on the leaves, first appearing in the middle and lower leaves, and then gradually develop upwards. Since magnesium is a component of chlorophyll, in the absence of magnesium, the leaves are usually chlorotic, beginning with the fading of the veins between the tips of the leaves and the leaf margins, turning from pale green to yellow, and then expanding toward the base and center of the leaf. However, the veins remain green and form a clear vein pattern on the leaves. In severe cases, the leaves wither and fall off. When the citrus is deficient in magnesium, the symptoms of the diseased leaves appear as rib-like yellow areas on both sides of the midrib, and the tip and base of the leaves maintain a long inverted triangle-shaped green area. These symptoms often occur on the old leaves of the mother tree.
Calcium Deficiency: The main feature of crop deficiencies is the emergence of symptoms at the young leaves, stems, and root growth points, with mild wilting, and heavy growth necrosis. Deformation of the young leaves, the leaves often appear hook-shaped, leaves shrink, the edge of the downward or forward curl, difficult to extract new leaves, the tips of the leaves stick to each other, sometimes the leaves are irregularly jagged, the tip and the edge of the hair Yellow or burnt and dead. Plants are dwarf or clustered, prematurely decayed, lodging, not robust or less robust.
Boron deficiency: Boron deficiency in crops is mainly affected by growth points, such as the growth of root tips and stems. In severe cases, the growth point atrophied and died, and a large number of lateral buds occurred, causing the plant to grow abnormally. After the death of the root tip, the lateral roots are long and the lateral roots die again, causing the root system to form a short stubble root. In the absence of boron, reproductive organs are most affected, flowering and fruiting are not normal, pollen malformation, buds, flowers and ovary are easy to fall off, and fruit seeds are not full. In severe cases, Lei did not see flowers, or see flowers do not see fruit, that is, there are more fruits and more pods, flowering time. Leaves are hypertrophic, rough, wrinkled, curled, withdrawing like dehydration, and chlorotic plaques that appear chlorotic, petiole and stem thicker, thicker or dehiscent, branches distorted, stem base swollen and swollen. When citrus boron is deficient in boron, it appears as water-stained yellow spots on new shoots, thicker veins, yellowing, bursting of leaves, malformation of leaves, stiffening of fruits, blackening of young fruit, rough and thick pericarp, and flesh dried, pale and tasteless.
Copper deficiency: Copper deficiency grows thin, and the new leaves lose green and yellow, withering and wilting. The tip of the leaf is white and curly. The leaf margin is yellow-gray, with necrotic spots on the leaves. There are many tillers or lateral buds. Organ development is blocked. Gramineous crops are generally sensitive to copper. In the absence of copper, the new leaves are grayish green, curled and yellow, and the old leaves are bent or broken at the ligule. The tips of the leaves are withered, grayish white spots appear on the lower part of the leaf sheaths, and sometimes they expand into gray stripes, and finally dry up and die. There are many tillers, which are clustered. Most of the tillers cannot draw stems into the panicles, or the panicles are distorted. They are not strong or have only a few pods. Copper deficiency in fruit trees, such as citrus, peach and other leaf chlorotic malformations, branches bent, long nodules or plaques. Even the top dead, and gradually developed downward, lateral buds increased, cracks in the bark, and secrete a jelly. The fruit is small and the fruit hardens.
Molybdenum deficiency: The symptoms of molybdenum deficiency in plants are of two types. One is that the color of the veins becomes pale and yellow, similar to the symptoms of nitrogen deficiency and sulfur deficiency. However, in the absence of molybdenum, the leaves are prone to spots, the edges are scorched and curled inwards, and are wilted due to tissue loss. Symptoms usually appear in the old leaves, and the new leaves are still normal for a long time. Shaped leaves have tips with gray, brown or necrotic spots and dry petiole and veins. The other type is the common symptoms of cruciferous plants, that is, the appearance of leaf elongated deformity, spiral distortion, old leaves thickening, scorch.
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