Dew is an important meteorological parameter in the paddy ecosystem and its ecological effects are many. On the one hand, adequate dew can maintain the moisture of rice leaf surface, improve the anti-transpiration ability of rice, promote the further dissolution of foliar fertilizer or pesticides, and facilitate the absorption and utilization of leaf tissue; on the other hand, dew provides the germination of certain pathogenic spores. The source of water, acid dew has a strong corrosive effect on rice leaves, dew thick, long duration will be unfavorable to rice pollen transmission, such as encounter a longer duration of advection cooling and cold weather, dew due to evaporation of heat during the day extended The duration of near-surface low temperatures increases the chilling severity of some rice crops. Dew is an important part of the water cycle of paddy fields. Dew in paddy fields in the Northeast can account for 6% to 9% of the total rainfall in the rice growing season. Due to the fact that dew is more difficult to collect, there are fewer studies on dew water quality analysis worldwide. Currently, dew-water quality analysis mostly focuses on urban ecosystems and desert ecosystems, and focuses on dew soluble ions (K+, Ca2+, NH4+, Comparison of Mg2+, Na+, Cl, NO3, HCO3, etc. and Rainwater Chemical Components. Foliar moisture sensors can be used to determine the effect of dew on rice leaf. Scan the QR code below to watch the Top WeChat official WeChat (also WeChat search: top instrument), agricultural equipment information in real time view: Hot Rolled Bar Steel,Hot Rolled Steel Bar,Sliver Steel Round Bar Henan Houming Industry Co., Ltd. , https://www.houmingsteel.com
Analysis of samples of dew from Amman in Jordan, dunes in northern India, and Croatian ports revealed that the concentration of major soluble ions in dew was higher than in rainwater. Dew, as an important water and nutrient input item in the farmland system, has rarely been reported on the soluble nutrients (such as nitrogen and phosphorus) that can be easily absorbed by crops. After fertilization in paddy fields, some nutrients (such as nitrogen) diffuse back into the atmosphere in gaseous form, and some of the substances will condense on rice leaves with water vapor at night. Studies have shown that the average loss rates of nitrogen and phosphorus applied in paddy fields in the black soil region of northern northeastern China were approximately 43% and 10%, respectively, and nitrogen and phosphorus accounted for 22.2% to 46.1% of rice for nitrogen absorption and utilization. The rest of the nitrogen passed. Volatile (about 8.8% ~ 17.2%), runoff and drainage (about 15.3%) losses in the form of; phosphate fertilizer is mainly lost through runoff and drainage. However, in the gaseous form (NH3 or N2O), the nitrogen volatilized is not completely lost, and the process of condensation during the night will cause part of the nitrogen to settle on the leaves and be used again by rice. In addition, dew can dissolve some of the dry deposition material on the leaves. It is speculated that the nitrogen absorbed by plants from dry and wet deposition may account for 10% to 30% of the total nitrogen absorbed by plants. The plant mainly absorbs inorganic nitrogen, rice mainly absorbs ammonium nitrogen, and the night vapor condensation process helps to increase the utilization of nutrient absorption by plants. Therefore, nitrogen, phosphorus and other substances contained in dew are very likely to be one of the potential ways for rice to absorb nutrients.
The annual input of effective nitrogen and phosphorus in paddy field dew is much higher than that of foliar fertilizer. It can be seen that the nighttime vapor condensation process does indeed enhance the utilization of nutrient uptake by rice. Nitrogen, phosphorus, and other substances contained in dew are directly absorbed by paddy leaves. One of the important ways of nutrients, dew is the input component of water and nutrients in the paddy ecosystem. It is worth noting that both dew and foliar fertilizers adhere to rice leaves in the form of liquid droplets, but both dew and foliar fertilizers tend to evaporate (evaporate). Therefore, the input flux of dew and foliar nutrient obtained in this paper is not final. The portion absorbed by rice.
The leaf surface humidity sensor measured the rice leaf surface and found that the nutrient elements in the dew water were absorbed by the crop. Further studies are needed. Other macro elements and trace elements (Zn, K, Mg, Ca, Mn, Cu, Cr) are needed. Conduct monitoring and analysis to more fully explain the ecological effects of rice dew. 
August 30, 2024