Effects of Low Temperature and Soil Moisture on Physiological Status of Wheat
Different plant species and different varieties of the same plant have different resistance to low temperature, and many physiological and biochemical changes occur in the plant at an affordable low temperature, and the formation of cold-resistant genes or antifreeze proteins can be adapted to low temperature stress, but with the With the constant decrease of low temperature and the extension of low temperature time, the plants will die. Therefore, the ability of the plants to recover after being exposed to low temperature stress (greening rate) can be directly judged by their ability to resist cold. In addition, the soil moisture content will also have a serious impact on the return rate of plants. Among them, we can use small meteorological stations to determine changes in several of these parameters to study the effect of low temperature and soil moisture on the rate of return to greening in wheat, or Can use a multi-point soil temperature and humidity recorder.
Through experiments, we have found that: After the winter is over the same low temperature, the rate of returning green through the process of slowly increasing temperature is significantly higher than the rate of returning green that suddenly increases to a high temperature. As the temperature decreases, the time of returning to green gradually extends and the rate of returning green decreases. The correlation analysis showed that there was a significant positive correlation between temperature and returning rate, and the correlation coefficient was 0.91. The soil water content was negatively correlated with the returning rate, and the correlation coefficient was -0.18.
Whether or not wheat can safely pass winter depends on the cold resistance of the variety (ie, genotype), but it is also affected by other factors such as the external environment and cultivation measures. For the same wheat variety, cold resistance is related to its sowing date, sowing volume and sowing depth, but also related to light, temperature, soil quality and soil moisture, fertilizer application types and how much. In this study, soil temperature and humidity loggers were used to study the method of controlling soil moisture in pots. It was initially proved that soil moisture exceeding 30% would lead to severe rot of wheat in the turning green period; soil moisture was moderate (about 25%) or low (20%) Left and right) is beneficial to wheat turning green and the roots grow vigorously; but when the soil moisture is low, the growth of wheat seedlings is weaker than when the soil moisture content is moderate; but if the soil moisture content is too low, the wheat seedlings will die. As to the extent to which the soil moisture content is low, it will lead to the failure of wheat to return green. Further research is needed.
UPE plastic,full name UHMWPE (ultra high molecular weight polyethylene) is a kind of thermoplastic engineering plastic with excellent properties of linear structure, with a molecular weight of more than 1.5 million.mainly have ESD UPE SHEET,CONDUCTIVE UPE.
Small density, good wear resistance, self - lubricity, impact resistance, corrosion resistance and so on.
Advantages:
1. Average molecular weight about 5,000,000 to 9,000,000;
2.The best abrasive assistance of all plastics , which 4 times higher than that of nylon 66 or teflon and 6 times higher than that of carbon steel;
3.Extremely high impact stength ,which is twice as high as PC ,5 times as high as ABS,it also retaines high toughness at liquid nitrogen temperature (-196'C);
4.Low friction coefficient ,lubricity is equal to that of Teflon ;
5.The best impact energy absorption value of all plastics ,with very good sound reduction effect ;
6.High chemical stability ,capable of resisting various types of corrosion and organic media within certain temperature and concentration range;
7.Strong adhensive resistance which is only second to Teflon;
8.UHMW-PE Plastic is safe , healthful and non-toxic and be can used in contact with food and drugs ;
9.Low density than any other thermoplastic ;
10.Excellent electrical insulation and static resistance ,good resistance to high energy radiation;
11.Moderate mechanical strength,stiffness and creep-resistant property'
12.Outstanding machining property ,very low water absorption .
Deficiencies:
Compared with other engineering plastics, UHMW-PE Plastic is resistant to heat resistance, stiffness and hardness, but can be improved by means of "filling" and "crosslinking".
From the point ofheat resistance, the melting point of UHMW-PE Plastic is approximately the same (136 ℃) and ordinary polyethylene, but because of its big molecular weight, melt viscosity high, so the processing difficulty is big.
Applications:
Papermaking industry : suction box boards ,scrapper,molding plate ,beating ,gear .
Mining industry : charging barrel ,abrasive and adhensive -resistant back lining for warehouses.
Chemical industry : acid pump ,fliter plate , worm gear ,bearing .
Food industry :packing machinery parts ,bottle guide ,screw .wear plate ,slide away ,stud weld ,roller and other transmission parts.
Tenxile industry : buffer board
Food processing industry : chopping block ,refrigerating plant
Wharf:anti-collision board
Specification: the thickness of UHMW-PE Plastic sheet material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width can exceed 1200mm, and the length is not limited.
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 600mm* 1200mm, and the commonly used specification of 10-180mm is 1200*3080mm. UHMW-PE Plastic can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited.
Color: Black and white, can also be made another color, and the color order is 500KG.
Modified varieties: UHMW-PE Plastic can be added to the Glass Fiber, copper powder, and molybdenum disulfide enhancement plate according to customer's requirements.
Add antistatic agent to the permanent plate, the volume resistance value of 10 to the 6 to 9 power.
Add flame retardant to the flame retardant board from UL 94v-0 to HB combustion grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.
Product certification: most environmental certification reports and safety reports forraw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
Uhmwpe Plastic Rod,Hdpe Plastic Rod,White Pe Plastic Rod,White Hdpe Plastic Rod
Dongguan Noegem Plastic Products Co.,Ltd , https://www.noegempLastic.com