In agricultural production, the lack of trace elements in crops is a common problem. Recognizing the symptoms of the deficiency of crops is of great significance for improving crop yields in low-yielding fields. Dr. Zhang Shuqing of the Soil and Fertilizer Institute of the Chinese Academy of Agricultural Sciences emphasized that in the morphological diagnosis of farmers, soil conditions, crop varieties, crop age, and climate, fertilization, and irrigation should be linked in order to make better use of these symptoms. Instruct fertilization.
When observing the symptoms of crop nutrient deficiency, you should first pay attention to where the symptoms appear. If the symptoms first appear on the old leaves, it means that the missing elements can be moved in the crop and can be reused; if the symptoms first appear in the new tissue, it means that the lack of elements is more difficult to move in the crop body, and also Hard to reuse.
Manganese deficient: The crop lacks manganese firstly manifests as leaf chlorosis, and the midrib is still green. The grass crops are parallel veins, and the missing green strips are long strips. The dicotyledonous plants are reticular veins, and the missing piece of green is round. Leaf blade protrusions between veins cause wrinkling of leaf edges. In severe cases, chlorotic patches expand and connect, brown spots appear on the leaves, and even burning phenomena appear, and the growth stops.
Zinc deficiency: Zinc deficiency in maize is the most sensitive. The prominent feature is that the plants are short and the internodes are shortened. The base of the young leaves of the seedlings becomes thin, white, and brittle. It is translucent and then spreads to the leaf margins. It is easy to tear when it is blown by the wind. The color is white and green, so it is also called "white flower seedling." In severe cases, the tip of the leaf turns red, and the entire leaf is dry and dead. When apples, oranges, pears, peaches and other fruit trees are deficient in zinc, leaf veins at the base of the leaves are chlorogenic, with short sections, small leaves, and clumps of clusters, commonly known as "lobular disease."
Boron deficiency: When crops suffer from boron deficiency, different crops have different symptoms. In the case of severe boron deficiency, some common symptoms occur in some sensitive areas. The plant lacks boron, the growth point is blocked, the internodes become shorter, the plants dwarf, the top withers, and there are a large number of axillary buds. The leaves are not even, they are thick and brittle, the curls shrink, and the petioles are short and even cracked. Boron deficiency results in crops that are small and small, with low seed setting rates or fruit set rates, and high empty shell ratios. Rapeseed “flowers are not realâ€, wheat “flowers are infertile†and cotton “flowers are absentâ€. Boron deficiency prone to acacia rickets, beetroot heart disease, radish brown rot, sweet potato brown spot, celery bentes disease, linen blight and so on.
Iron deficiency: The symptoms of iron deficiency in crops are the chlorotic chlorosis between stem and leaf veins (iron is immobile in the crop). In severe cases, the entire new leaf turns yellow, the veins gradually turn yellow, and eventually it turns almost white. The old leaves also showed signs of yellowing of the veins, and the leaf margins or tips of the leaves appeared scorch and necrosis. The continued development led to leaf shedding and plant growth stagnated and died.
Copper deficiency: The crop lacks copper and the leaves are easy to lack of green. Starting from the tip of the leaf, the tip of the leaf is chlorogenic, dry and curled. The symptoms are similar to that of the herbaceous plant. The tip of the leaf is gray-yellow, and then it turns white. There are many tillers but no heading or Spikes are scarce, the ears are empty and white, the plants are short and dry, and the internodes are shortened like a clump of grass. When the trees are short of copper, they will die.
Deficiency of molybdenum: molybdenum deficiency in crops is most sensitive to legumes, and the general symptoms are firstly expressed on the old leaves, chlorosis between leaves and veins, yellow-green or orange-red spotted leaves, severe stalks are weak, tip is gray, leaf margins are curled , Withering and even necrosis, and then to the new leaf development, and sometimes the growth point of death. The legumes of the leguminous crops are small and pale, with poor growth and delayed flowering.
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