It is generally believed that good varieties should have the following characteristics: 1 High yield per unit area; 2 High oil content of sunflower seeds. 3 strong resistance; 4 wide adaptability. However, the following points should also be noted when selecting and using hybrids. (1) Purity of hybrid seed. The higher the purity, the higher the yield and vice versa. Therefore, when selecting seeds, be sure to ask for purity and prevent adulteration. The purity of the variety can be known from the investigation of the growth stage of the oil sunflower. The high-purity varieties have uniform and uniform plants, neat flowering stages and no sterile plants. (2) Regional differences. Some people think that as long as the introduction of a well-known fine breed can achieve high yields in the area of ​​introduction, this view is sometimes correct, and sometimes it is not working. When introducing, consideration should be given to the similarity of the local climatic conditions with the introduction places, especially accumulated temperature, frost-free period, rainfall, etc., because the local frost-free period is short (for example, 100 days), and the introduced varieties have too long growth period, and the new varieties cannot be normal locally. Mature, resulting in reduced production. In addition, if you refer to neighboring villages and neighboring counties (flags) to introduce new varieties of experience, they can often succeed. Roundness Measuring Instruments
Roundness meter is a length measuring tool for measuring roundness using the rotary axis method. The roundness meter is a measuring tool for measuring the roundness error of the workpiece using the rotary axis method. Roundness tester is divided into two types: sensor rotary type and workbench rotary type. During measurement, the measured part is installed concentrically with the precision shaft system, and the precision shaft is attached with an inductive length sensor or a workbench for precise circular motion. It is composed of sensor, amplifier, filter and output device of the instrument. If the instrument is equipped with a computer, the computer is also included in the system.Roundness Tester
The principle of the roundness meter is the same as that of the coordinate measuring machine. In fact, its working principle is very simple. The coordinate measuring machine is a point acquisition tool. Its principle is to collect points first, and then form a line from points, and then form a three-dimensional model from lines. CMM is a kind of measuring equipment that has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (not necessarily large or huge). The measuring head can be moved to the measured point easily by manual or motorized means, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously, this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measured volume can be displayed through the reading device and digital display device.
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