Spring ploughing and ploughing, fake and inferior agricultural resources are annoying. On the 14th, the reporter visited a well-known agricultural experts and used the simplest method to teach the farmers how to recognize the difference.

seed

Most of the seeds on the market today are coated seeds, and identification is difficult. Farmers can judge the pros and cons from the price. The cost of seed coating is higher and the price is not too cheap. The second is to identify with salt water soak. Grab a small amount of seeds and soak them in salt water for a while. The seeds are not full and float on them. The third is to look at the appearance. Good seeds are generally coated uniformly, with consistent color and uniform particles. The difference is different in color, the grain is uneven, and the coating is thin and thick.

Be sure to choose a variety that is suitable for local cultivation. It is best to buy bulk seeds.

pesticide

The advantages and disadvantages of pesticides, farmers can use the naked eye to know one or two.

Powder, wettable powder: If there is agglomeration or more grainy, it has been deteriorated by moisture.

Emulsifiable oil: It should be a homogeneous liquid, no precipitation or suspended matter. If stratification occurs, it indicates that it has expired.

Suspension emulsion: It should be a flowable suspension, no agglomeration, long-term storage, there may be a small amount of stratification, but it should be restored to its original state after shaking. If the product does not return to its original state after shaking, or there is still agglomeration, the product has quality problems.

Aqueous: It should be a homogeneous liquid, no precipitation or suspended matter.

Granules: The product should be uniform in thickness and should not contain many powders.

fertilizer

Judging from the appearance of the fertilizer, you can start from the following aspects.

Look at the granularity. Nitrogen and potassium fertilizers are mostly crystalline; phosphate fertilizers are mostly amorphous or lumpy. The high-quality compound fertilizer has uniform particle size and specific gravity, smooth surface, and is not easy to absorb moisture and agglomerate. The fake and inferior fertilizer particles are uneven in size, rough, humid, and easy to agglomerate.

Look at the color. In addition to lime nitrogen, nitrogen fertilizer is almost all white; potassium fertilizer is white and red; potassium dihydrogen phosphate is white, and phosphate is mostly dark gray.

Smell the smell. For example, ammonium bicarbonate has a strong ammonia odor; ammonium sulfate is slightly sour; superphosphate has a sour taste. The fake and inferior fertilizers are not obvious.

Reacts with alkaline substances. Ammonium too nitrogen fertilizer is mixed with lime water and ammonia gas overflows.

Burning. The fertilizer sample is heated or burned to further identify the fertilizer from the color of the flame, the melting condition, the smell of the smoke, the residue, and the like. Such as nitrogen fertilizer: ammonium bicarbonate, direct decomposition, a large amount of white smoke, strong ammonia smell, no residue.

Water soluble. All fertilizers soluble in water: ammonium sulfate, ammonium Chloride, ammonium nitrate, urea, potassium nitrate, potassium sulfate, ammonium phosphate, etc., as well as potassium dihydrogen phosphate (ammonium), some trace elements and other simple fertilizers. Borax is only soluble in hot water above 40 °C. Partially soluble in water: superphosphate, heavy superphosphate, calcium ammonium nitrate, etc. Water-insoluble fertilizer: phosphate rock powder.