Cotton is a warm, hi-light crop. Therefore, the cotton field should choose a flat or sunny slope above the soil. Cottonseed should be selected, and the germination rate, hairy seeds and light seeds should be removed, and the germination rate should be no less than 90%. Cotton is good. Not resistant to shading. The annual sunshine hours are required to be more than 2000 hours. The sunshine rate is over 40%. Xinjiang and Gansu are more than 60%, which is more suitable. Generally, the cotton base fertilizer applies 20-23 kg of urea per 667 square meters, 50-55 kilograms of superphosphate, 10-12 kilograms of potassium sulfate in the potassium-deficient plot or high-yield field. From emergence to bud, usually 40-50 days, the first 3mm-sized bud on the cotton plant is called bud, and when the main seed of the cotton seed grows 7-8 leaves (not including 2 cotyledons), it is bud. In the cotton seedling stage, it is best to spray photosynthetic nutrient film fertilizer to enhance photosynthesis capacity nutrients and chlorophyll, and to absorb a large amount of light energy, light, compatible with conventional fertilizers and nutrients to supply plant growth and development to the limit. In the bud stage of cotton, cotton growth is measured by the initial bud period, the bud period, and the daily increment of plant height. It is an important period for determining the number of bells. The period from flowering to boll opening, generally 50-70 days (flower see flower, forty-eight), the cotton growth condition is measured by the initial flowering period, full flowering period, belling period, and belling strength. This stage is the flowering and bolling period of cotton. Most of the flowering and bolling periods occur when the branches are mad and the top of the cotton bolls is prominent. Foliar fertilizer topping agent is melted into mother liquor by adding 1 kg of water per bottle, and then added to 500 kg of water to stir and dissolve. Spray on the top of the cotton before and after sitting in the early flowering stage, spray three times in a row, each interval of 7-10 days. Force the top of the cotton back to the development of the cotton, weakening the top advantage until the top stops growing. Thereby achieving the purpose of topping. It can effectively improve the canopy permeability of the cotton field, prevent premature aging, increase the effective boll weight, increase the yield, and increase the cost.
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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