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你用的农药是否失效可以这么鉴别

2019-07-23 点击:972 钢材新闻

Commonly used authentication methods are:

01 Intuitive Method

For powder pesticides, look at the appearance first. If it has been obviously agglomerated by moisture, the taste of the medicine is not strong or abnormal, and it can be smashed into a group by hand to explain the basic failure. For the emulsion pesticide, the medicine bottle is first set to stand, if the liquid is turbid. Clear or stratified (ie, oil-water separation), precipitate formation or floc suspension, indicating that the agent may have failed.

02 heating method

Suitable for pharmaceutical pesticides. Take 5-10 grams of pesticides and heat them on a piece of metal. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, it means that it has failed.

03 floating method

Suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the surface of the water and carefully observe it. It is a pesticide that is wet and can sink in water within 1 minute, otherwise it is a pesticide.

04 suspension method

Suitable for wettable powder pesticides. Take 30--50 grams of pesticide, put it in a glass container, first add a small amount of water to make a paste, then add 150-200 grams, stir well with water, let stand for 10 minutes to observe, and the pesticide that has not failed is well soluble. The separation of the suspension in the chemical solution is small, the sedimentation rate is small, and the amount of precipitation is small, and the pesticide is reversed.

05 oscillation method

Suitable for emulsion pesticides. For pesticides with oily water layer, first shake the agent vigorously and let it stand for 1 hour. If stratification still occurs, it indicates that the agent has deteriorated.

06 hot melt method

Suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C ~ 60 ° C) after 1 hour, if the sediment dissolves, you can continue to use; if the sediment is difficult to dissolve or If it does not dissolve, it will be invalid.

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