First, the harm symptoms Symptoms of clubroot disease occur in the roots. These "tumors" are spindle-shaped or irregularly shaped, mainly occurring on the main root and less on the lateral roots. At the beginning, the "tumor" surface was smooth and white, after which the color gradually turned brown, and the surface was rough, and cracking occurred for a long time. These cracked "tumors" are easily rotted and smelly by other pathogens. In the early onset, at noon, due to high temperatures, the transpiration of rape increased, and a lot of water was lost. At this time, because the roots were damaged by “tumorsâ€, the ability of the roots to absorb water and fertilizer was already reduced. In addition, the above-ground part of the diseased plant is prone to wilting; when the temperature is low in the morning and early evening, the transpiration of rapeseed is small and the water dispersion is less, so no wilting occurs. As the disease continues to deteriorate, the disease strain will be completely wilted or even die. Second, control methods 1, prevention. The prevention and treatment of the clubroot disease must first start with the cultivation and management, eliminate or reduce the number of bacteria in the rape field from the source, and create an environment conducive to the growth of rape and not conducive to the growth of pathogens. Method: Do not call rape seed from the ward; with other non-cruciferous crops, it is best to rotate with rice, serious disease field for 4-5 years of rotation, can effectively reduce the disease; built rape drainage facilities, narrow ditch畦 清 清 清 清 清 清 清 清 清 清 清 清 清 清 清 清 清 清 清 å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ å¯ä½¿ Fly ash compound fertilizer to improve the soil. Choose no-seed field crops to prevent the spread of germs. After the rape is harvested, the diseased plants should be burned or composted. Note: Compost must be decomposed before it can be used in rape fields. Taking the above measures can reduce many of the onset of the disease, but it does not stop the disease. 2, governance. When there is a small amount of clubroot disease plants in the field, it is necessary to remove the diseased plants in time and sprinkle lime in the diseased areas to disinfect the soil. If the number of diseased plants is large, 50% carbendazim WP may be used to irrigate the roots with 250 ml per plant, or 40% pentachloronitrobenzene powder may be used to irrigate the roots with 400-500 granules per plant. ML can also effectively control the condition.
The image measuring instrument is based on CCD digital image, relying on the powerful software capabilities of computer screen measurement technology and spatial geometry operation. After installing the special control and graphic measurement software, the computer becomes the measurement brain with the soul of the software and is the main body of the whole equipment. It can quickly read the displacement value of the optical ruler, and obtain the desired result instantly through the software module operation based on the spatial geometry; A graph is generated on the screen for the operator to compare the image with the image, so that the possible deviation of the measurement results can be identified intuitively.
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