The concentration of chlorophyll in the water body reflects the content of phytoplankton. Monitoring the content of chlorophyll in water can determine the degree of eutrophication of the water body, and provide early warning of water pollution, algae blooms, and red tides. The chlorophyll sensor adopts the measurement principle of fluorescence method: the substance to be measured is irradiated with excitation light of a certain wavelength to excite it to a high-energy state, and when it returns to the ground state from the high-energy state, it will emit fluorescence greater than the excitation wavelength. The excited fluorescence intensity is the same as that of the substance to be measured Concentration dependent. Digital chlorophyll sensor is an online electrode with RS485 communication interface and standard Modbus communication protocol. Based on fluorescence optical method technology, the chlorophyll sensor has strong anti-interference, high sensitivity, no need for pretreatment, fast measurement, and can measure chlorophyll a of water quality. The chlorophyll sensor is used for plants, algae growth, water eutrophication; early warning of algae outbreaks; the best choice for studying water ecosystems.
chlorophyll sensor, chlorophyll probe, chlorophyll sensor water Suzhou Delfino Environmental Technology Co., Ltd. , https://www.daruifuno.com
First, the concentration should be accurate. The concentration of different fertilizers is different. According to the comparison of spray fertilizer concentration, the optimum concentration of urea is 0.2%-0.3%, borax is 0.3%-0.5%, ammonium molybdate is 0.2%-0.3%, and potassium dihydrogen phosphate is 0.4%. The spray concentration of other fertilizers should be prepared in strict accordance with the instructions or under the guidance of the technician.
Second, the fertilizer should be mixed well. Some trace element fertilizers such as ammonium molybdate are not easily soluble in water. When preparing, dissolve with a small amount of alcohol and then add water to the desired concentration to make the fertilizer liquid uniform. In addition, adding a small amount of soapy water or washing powder to the fertilizer solution to mix well can greatly improve the adhesion of the fertilizer solution on the leaves, which is beneficial to the absorption of fertilizer. After the fertilizer solution is prepared, it should be sprayed in time to prevent precipitation for a long time.
Third, the spray fertilizer should be in place. Many farmers only spray the fertilizer on the front of the blade and ignore the back. The results are often not ideal. Because the foliar fertilizer is mainly absorbed by the leaves through the pore diffusion, the distribution of the pores on the leaves is more than the front side. Therefore, foliar spray fertilizer should pay attention to the front and back spray, especially the back of the blade.
Fourth, the time for spraying fertilizer should be appropriate. The effect of foliar spray is affected by factors such as temperature, light intensity and rain. Spraying should be carried out in the morning and evening, especially in the evening, because the light is not too strong, the temperature is low, and the leaf surface is wet for a long time after spraying, which is beneficial to the absorption of fertilizer by the leaves and the improvement of fertilizer efficiency. Avoid the noon at noon, especially the hot days, avoid the evaporation loss of fertilizer, and do not spray before the rain to prevent the fertilizer from being leached by the rain.
Huaxian Agricultural Technology Promotion Center Sun Caixia 
Crop leaf spray fertilizer four attention
Foliar spray fertilizer is an important measure for crops to carry out topdressing. Especially the application of trace element fertilizers and the application of topdressing crops into maturity are of great significance. The roots of the crops that have entered the mature stage are aging, the absorption capacity is weakened, and the root topdressing effect is not good. For foliar application, the dosage is small, the effect is quick, and the utilization rate is high. However, the following points should be noted in the specific operation ratio.
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