First, choose the daytime high temperature period medication In the high temperature season, the effect is generally better after 4 pm, when the leaves of the crops absorb the most pesticides. In winter, it is different. It is advisable to apply herbicides at high temperatures during sunny days. Weeds absorb high speeds, have a large number, and have difficulty in metabolic decomposition, so it is easy to achieve the purpose of weeding.
Second, it is not constant to increase the amount of pesticides used to increase the amount of pesticides. The higher the temperature at normal temperature, the lower the lethal dose of pests. Therefore, it is necessary to increase the dosage in winter to prevent pests and diseases. Can not be killed after. The increase in the amount of drug should be determined according to the temperature of the temperature, but generally should not exceed 50% of the regular dose.
Third, it is necessary to rationally select pesticides suitable for winter application. In general, stomach poisons and contact agents are less affected by temperature, and systemic and fumigants are more affected by temperature, such as trichlorfon, dichlorvos, dimethoate, methylamine. Phosphorus, etc., low temperature will obviously affect its insecticidal effect; and pesticides such as pyrethroid, deltamethrin, phoxim, stone sulfur mixture can still exert better insecticidal effect at lower temperature. . Therefore, when using in winter, it is best to choose several types of pesticides after application. The use of herbicides in the low temperature season in winter shows that the effect is much longer than when applied at high temperatures. Therefore, be patient after the medication, as long as the liquid is sprayed into place, generally do not need to re-medicate.
4. To extend the safe interval of crops, pesticides will be applied in winter, and the degradation rate of pesticides will be slower. Therefore, the residues in crops will be relatively prolonged. Especially in the prevention and control of vegetable pests and diseases in winter, special attention should be paid to prolonging the safety interval of pesticides. To ensure human health and prevent poisoning accidents.
Zhejaing Sealand Technology Co., Ltd. is a trustworthy manufacturer of Mass Flow Meter, Mass Flowmeter, Mass Meter, Flow Meter, Flowmeter, ATEX, IECEx & CE approved. The product range covers different size from DN03 to DN150, and bigger sizes are being developed.
Sealand mass flow meter is designed and produced according to world`s latest Coriolis technology with exelent appearance, stability and accuracy to measure mass flow rate of a fluid traveling through a tube, widely applied to alternative energy, oil & gas, chemical, food & beverage, industrial energy, marine, power, pulp & paper, water & wastewater industries, etc.
Mass flow meter measures the mass based on Coriolis effort. The operating principle involves inducing a vibration of the tube through which the fluid passes. The vibration, though not completely circular, provides the rotating reference frame that gives rise to the Coriolis effect. While specific methods vary according to the design of the flow meter, sensors monitor and analyze changes in frequency, phase shift & amplitude of the vibrating flow tubes. The changes observed represent the mass flow rate and density of the fluid.
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Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeter.com