Observe that the powder or wettable powder is obviously damp, and the powder has become a solid block, indicating that it has failed. If the emulsion pesticides appear to be oily, moisture layer or precipitate after standing, it is also a manifestation of failure and deterioration. The liquid pesticides are turbid and unclear after standing, and there are flocculent precipitates, which also indicates that they have failed.
Suspension method to identify wettable powder, 50 grams of pesticide can be poured into the bottle, and then add appropriate amount of water to stir evenly, wait a moment to observe. Deteriorated pesticides have poor suspension and precipitation is much faster.
The heating method puts the liquid or emulsion which has formed a precipitate into a hot water, and after standing for one hour, the precipitate of the non-failed pesticide slowly dissolves, and the precipitate of the failed pesticide does not dissolve. Chen Guishan Wheat reasonable topdressing techniques For wheat fields with normal growth and high fertility levels, joint fertilizer should be applied in conjunction with watering at jointing stage. For medium-fertilized wheat fields, quick-acting fertilizers can be applied in combination with watering in the rising period, and new high-fat membranes can be sprayed to increase the utilization rate of active ingredients of fertilizers. For the three types of wheat seedlings with poor dry growth, topdressing should be carried out twice in the early spring and jointing stages on the basis of early spring slashing, and the spleen sapling should be sprayed to promote the spring stalks, increase the ear formation rate and promote Small flowers develop strong and increase the number of grains per ear.
For late seedlings that have not been applied at the time of sowing or have a small amount of fertilizer, they should be used for topdressing when the soil is just frozen, but it is not suitable to pour back the green water to avoid the decrease of ground temperature and poor soil permeability, which will affect the growth of wheat plants. On the basis of fine slashing, fertilizer and water promotion can be carried out in the early stage of wheat getting up, and it is better to apply about 10 kg of urea per acre. Watering should be carried out when the average temperature is stable at around 5 °C, so as to prevent freezing damage from premature watering. Liu Qing Use of antifreeze for agricultural machinery Before adding antifreeze, remove the scale of the cooling system and drain the residual water to avoid dilution of the antifreeze and reduce the freezing point of the antifreeze. Antifreeze can only be added to 93% to 95% of the cooling system capacity. The antifreeze is hygroscopic and the cooling system should be sealed.
Ethylene glycol and ethanol antifreeze are toxic. Do not touch the skin. Do not use mouth to avoid poisoning. Ethylene glycol is an organic solvent. When filling, do not leak or spill on the body and surface paint to prevent the paint from falling off. When the anti-freeze solution of ethylene glycol or glycerin is reduced due to volatilization, add clean water in case of emergency. Ethanol, glycerol-ethanol antifreeze, the alcohol contained is volatile and burning. Therefore, attention should be paid to fire prevention.
Antifreezes of various types, different types and different freezing points cannot be mixed and mixed. Xu Chengwen
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