How to prevent greenhouse weak tomato disease

Too low light tolerance of tomato, referred to as low light disease, is a kind of physiological disease caused by insufficient light, which mainly occurs in the winter and spring seasons. Hazardous characteristics The tomato is sensitive to the light reaction. When the light is insufficient, the growth and development are slow, and the falling flower increases. If the temperature is low under low light conditions, the amount of pollen is reduced, the starch grains are also small, the pollen germination rate is reduced, the style of the pistil is not well developed, and the ability to fertilize is reduced, and the unfertilized flower will fall off. Under low light conditions, the development of the fruit is inhibited, the weight of the single fruit is reduced, and the empty fruit and fruit rot are increased. Prevention measures are mainly to improve lighting conditions in the shed as much as possible. When planting, increase the row spacing and reduce shading between the plants; keep the shed membrane clean and prevent the membrane surface from adhering to water droplets and dust; when the external temperature reaches 15°C before and after the tomato growth and noon, properly expose some of the shed membranes. The sun shines directly into the shed. According to another test, the use of polyester aluminized film spliced ​​into 2 meters wide, 3 meters long reflective screen, hanging in the plastic greenhouse (or greenhouse) after the upper end of the column, hanging down to the ground, the ground can add 40% to 43%, The greenhouse temperature increased by 3°C～4°C, the ground temperature increased by 1.8°C～2.9°C, the yield of tomato was 41.8%～58.1%, and the quality of the fruit was improved; the laying of silver gray film or aluminum foil on the ground could also increase the light intensity among the plants and make the tomato It is well colored and prevents premature aging of the lower leaves.

Roundness Tester

A roundness tester is a measuring tool that uses the rotation axis method to measure the roundness error of a workpiece. The roundness tester is divided into sensor rotary and workbench rotary. During measurement, the measured part is installed concentric with the precision shaft system, and the precision shaft is equipped with an inductive length sensor or workbench for precise circular motion. The roundness meter consists of an instrument's sensor, amplifier, filter, and output device. If the instrument is equipped with a computer, the computer is also included in this system.

A roundness tester is a precision instrument used to measure the out-of-roundness of a rotating surface (shaft, hole, or spherical surface) of a component. There are usually two types: small desktop, where the workpiece is mounted on a rotating workbench and the measuring head is mounted on a fixed column; and Large floor mounted, with the workpiece installed on a fixed workbench and the measuring head installed on the rotating spindle. During measurement, the measuring head contacts the workpiece's surface, and the instrument's rotating part (workbench or spindle) rotates for one cycle. Due to the extremely high accuracy of the supporting bearings in the rotating part, the measuring head will generate a high-precision circular trajectory on the measured surface during rotation. The out-of-roundness of the measured surface causes the measuring head to shift and transform into an electrical (or pneumatic) signal. After amplification, it can be automatically recorded on a circular recording paper, and the out-of-roundness of each part can be directly read out for accuracy evaluation and process analysis and widely used in precision bearings, machine tools, and instrument manufacturing industries.

The Roundness Testeradopts a radius measurement method and operates in a rotating manner. The rotation axis system of the roundness meter adopts a high-precision air floating spindle as the measurement reference; The electrical part of the roundness tester is composed of advanced computers, precision circular grating sensors, and precision inductance displacement sensors. The circular grating sensors and precision inductance displacement sensors measure angle and radial displacement, ensuring the accuracy of measuring the angular displacement and radial value of the workpiece; The roundness meter measurement software adopts a roundness measurement software based on the Chinese version of WinXP operating system platform, completing data collection, processing, and measurement data management.

China Roundness Measuring Instrument,Roundness Tester Machine,Mitutoyo Roundness Tester Manufacturer

Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com