(1) The young leaves of the zinc-deficient seedlings were light yellow and even white seedlings, the central leaves had obvious green stripes, and the old leaves were gray-brown. At this time, 1.5 kg of zinc sulphate may be applied or sprayed with 0.2%-0.3% zinc sulphate solution, and sprayed continuously for 3 times, each interval of 5-6 days.
(2) The leaves of the old molybdenum-deficient leaves are chlorotic and yellow, and the leaves are curled inward and curled, and the kernels shrink. At this time, foliar spray can be performed with a 0.15%-0.2% molybdic acid solution.
(3) The leaves of the new iron deficiency were chlorotic and yellow, and the veins remained green and showed a stripe shape. The stems and sheaths were purple-red. At this time, the surface was sprayed with 0.2-0.3% ferrous sulfate solution, and sprayed three times.
(4) Young leaves lacking boron can not be opened and whitish, gradually withering and dying, white streaks between the old leaves and veins, and the plants are short and thin. At this time, 85 g of borax or 60-60 g of boric acid can be sprayed with 60 kg of water for foliar spraying, and sprayed 3 times.
(5) The symptoms of Mn deficiency often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white. At this time, 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.
(6) The copper-deficient plants grow slowly and are short, and the tops form a cluster after they die. The leaves are grayish yellow or red and yellow with white spots, and the ear development is poor. It can be applied to 1 kg of copper sulfate or foliar spray with 0.2% copper sulfate solution.
The commonly used Pipette kits are mainly composed of a pipette and a pipette tip. The pipette tip is a single empty
Cavity reservoir; the pipette uses the principle of air displacement and controls the maximum displacement of the piston by rotating a screw with an ultra-fine thread
displacement, and then control the amount of liquid suction. There are the following problems when using the above kit for suction: 1. The suction volume is controlled by the pipette
After the pipette is sterilized or used for a period of time, it is easy to cause "hidden" failures, which cause the operator to be difficult to detect.
The actual suction volume is inaccurate, and it needs to be adjusted frequently, and the operation is cumbersome and time-consuming; 2. To improve the pipetting accuracy, the operator's
The operation requirements are high, and it is easily affected by factors such as the suction speed, the depth of the tip below the liquid level, and the inclination angle of the pipette.
The actual suction volume will be heard; 3. The actual suction volume will be affected because the suction head cover is not tight and leaking, and it will not be easily detected; 4.
When performing experiments that require high accuracy, such as analysis, in the operation of equal volume aspiration of liquids with different densities, the actual
The actual suction volume will be affected by the density itself; 5. In order to improve the accuracy, this type of pipette needs to carry out high
Cost-optimized design results in extremely high pipette costs.
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