Ordinary Chinese cabbage is a kind of vegetable species that enjoys cool and cool weather conditions. During its growth, due to the high ambient temperature, it often results in leggy seedlings, high rate of dead seedlings, severe virus disease, bitter taste, and a significant increase in fiber content. The leaves are prone to yellowing, rot, etc., and cabbage cultivation causes no small problems. Therefore, in order to improve the quality of vegetable cultivation, common heat-resistant and high-quality Chinese cabbage varieties are urgently needed in summer cultivation, and conventional cabbage seedlings are researched using artificial climate chambers. Phase heat resistance is the basis for studying the comprehensive performance of plants adapting to high temperature conditions to provide a basis for the selection of new materials for common Chinese cabbage. PET jar preform mould for producing big neck of PET preforms, such as candy bottle, cosmetic bottle, can and so on. With the advanced technology and good imported material support, compared with the tranditional preform mould, our mold cavity broekn rate is much lower. The guarantee is 1 million shots. It suitable for all PET injection machine in market. Pet Preform Mold,Pet Jar Preform Mould,Pet Tube Preform Mold,Pet Preform Injection Mould WENZHOU WINIBER MACHINERY EQUIPMENT CO., LTD. , https://www.winibermachinery.com
The artificial climate box is a kind of equipment that simulates the natural environment. It can create both low-temperature and high-temperature environments. Therefore, using an artificial climate box to study the heat-resistance at the seedling stage of common Chinese cabbage, it is possible to avoid interference from the external environment and create experiments. condition. During the experiment, 10 common Chinese cabbage materials with different degrees of economic traits and different degrees of autumn cultivation were selected, and artificial climate chambers were used for high temperature treatment. The day and night temperatures were set at 32°C/22°C, 35°C/25°C, and 37°C. /27°C, 38/28°C, 39°C/29°C, 40°C/30°C, humidity controlled at 50%, photoperiod 12h/12h (day and night), mild light 12000Lx, investigation of heat damage symptoms and calculation of heat every 24h Damage index.
Using artificial climate chamber high temperature treatment method, the results obtained show that under different high temperature stress, all test materials will have different degrees of thermal damage symptoms, such as leaf rewinding, chlorosis, etc., and with the increase of temperature With the prolonged treatment time, the heat damage symptoms have increased. The heat injury index of the seedlings was treated with 37°C/27°C (day/night) for 4 days in spring and autumn, and the difference in heat tolerance between common Chinese cabbage varieties could be significantly reflected. The use of natural temperature in summer after seedling growth at 37°C/27°C (day/night) does not significantly distinguish the differences in heat resistance between common varieties of Chinese cabbage.