The right amount of dew has an important effect on the maintenance of rice leaf wetness, and it can improve the anti-transpiration ability of rice, which is conducive to the absorption and utilization of leaf tissue; however, dew provides a water source for the germination of certain pathogenic spores. The leaves have a strong corrosive effect. Heavy dew and long duration will adversely affect the pollen propagation of rice. For instance, if there is a long period of advection, cooling, and cold damage, the dew will prolong the duration of near-surface low temperatures due to evaporation during the day. Increase the degree of chilling in some rice crops. For the analysis of the leaf surface humidity, the application of the leaf surface humidity sensor is indispensable. Add WeChat, you want to have: New Energy Vehicle,Efficient Charge Cable Assembly Line,Automatic Charge Gun Assembly Line,Ev Charge Cable Assembling Wujiang Jinlan Machinery Manufacture Co.,Ltd , https://www.jinlan-technology.com
Experiments using poplar rods as collectors can simulate the condensation of water vapor on rice more realistically. In 2013 rice growing season (mid-June to mid-October), observation frames were set up at the site of moderate plant density in paddy fields. Each observation frame was provided with observation arms with two heights (bottom (about 5cm above the water surface) and rice canopy). Adjust height as rice grows. In the paddy field, the evaporative water vapour in the accumulated water mainly condenses on the bottom collector. The water vapor generated by the transpiration of the crop and the water vapor in the atmosphere mainly condense on the collector of the crop canopy. During the growing season of rice, the dew of the paddy field was observed every day. 1.5 h after the sunset, the accurately weighed collectors were placed on the observation arm at different heights, with 3 repetitions of each height; and collected at 30 min before dawn on the morning of the following day. Remove the device and carefully put it into a cleanable plastic box that can be sealed and quickly return it to the Sanjiang Station Laboratory (to the nearest 0.001g). If the collector has gained weight, dew condensation occurs at night, and the increased weight is the amount of dew condensation on the surface of the collector. If there is no weight gain, no dew condensation occurs at night, which means that there is no dew condensation.
The measurement and analysis of the leaf surface humidity sensor found that direct absorption of nutrients by the leaves of rice is an important nutrient input method. Foliar and dew are both the same sources of nutrients attached to the leaf surface of rice, to further explain the fact that dew provides nutrients for rice fields. Flux, quantitative calculation of dew and foliar fertilizer effective nitrogen and phosphorus input. When calculating the dew input flux, a weighted average of the available nitrogen and phosphorus concentrations should be used. However, since it is not possible to ensure that dew samples can be collected for each dew condensation event, this study uses arithmetic averages to calculate the available nitrogen. Phosphorus input flux. 