During the whole process of growth and development of wheat, it is necessary to observe the wheat leaves diligently and skillfully apply micronutrients to ensure normal wheat growth and development. "Three-color" shrinking wheat leaf during the growing period of zinc deficiency, wheat leaf margin was shrunken or distorted, veins from green to yellow on both sides of the veins, was yellow, white and green three-colored stripes, and the earing of late, small spikes less. For zinc deficiency, spray 0.3 to 0.4% of zinc sulfate solution on the leaf surface for 2 to 3 times. Yellow-white leaves are caused by iron deficiency. The young leaf veins begin to lose green-yellowness, the veins remain green, and afterwards they completely lose their green color. Sometimes the entire leaf is yellow-white at first. For this can be used 0.75% ~ 0.9% of ferrous sulfate solution for spraying 2 ~ 3 times. The edge of the tip of the white tip of the sharp white leaves turned white with yellowish gray edges. This type of leaf is caused by copper deficiency. When it is severe, it cannot head at the heading stage. The prevention and control method is: using 0.03% to 0.04% of copper sulfate solution for spraying 2 to 3 times. When softly hanging leaf leaves wheat lacking manganese, the leaves softly droop and the veins change from green to yellow. This can be immediately sprayed with 0.1% manganese sulfate solution twice. In the absence of molybdenum in yellow-white spotted wheat, the leaf color becomes lighter, small yellow-white spots appear along the veins of the leaves, and gradually become linear or flaky, and finally the leaves are dried up. For the phenomenon caused by this lack of molybdenum, the prevention and control method is as follows: 0.05% to 0.1% ammonium molybdate solution is sprayed on the leaves for 2 to 3 times. The lack of boron in the purple-brown leaf wheat delayed the growth period, and the leaf tip appeared purple-brown. At the same time, its flower is not loose powder, pollen is less or deformed, sometimes no pollen, lateral enlargement of ovary, glume is not closed early, withered later. Can be used boric acid 50 ~ 100 grams of water 50 ~ 60 kilograms of foliar spray, generally in the wheat seedling stage, heading stage of each spray 1 times. China Agricultural Network Editor
Blood Collection Needles
Blood collection needle used for collecting blood samples in the process of medical examination is composed of a needle and a needle rod, the needle is arranged at the head of the needle rod, the needle rod is sliding connected with a sheath, and a reset spring is arranged between the sheath and the needle rod, and the initial position of the sheath is located at the head of the needle and the needle rod. When the operator holds the needle in hand and presses the blood collection needle on the patient's limb, the sheath retracted under the elastic action of the skin to make the needle protrude and Pierce into the skin, resulting in minimally invasive injury. After the blood collection needle is removed, the sheath is reset under the action of the reset spring and the needle head is covered to avoid the contamination of the needle exposed or accidental stabbing of the human body. When the blood collection needle is removed, the cavity between the needle and the skin gradually increases, forming instantaneous negative pressure, which is conducive to the collection of blood samples.
Blood Collection Needles,Multi Needle,18G Open Needle,20G Needle,Blood Taking Collection Needle
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