How to distinguish between true and false phosphate fertilizer
Phosphate fertilizer is a kind of quick-acting fertilizer. At present, there are many methods to identify the true and false phosphate fertilizer, there are mainly the following four kinds: observe the color and shape of standard phosphate fertilizer is grayish white, the shape is powder. If the color is found to be white or yellow, it may be due to incomplete acid treatment and low phosphorus content. If the phosphate fertilizer is wet and lumped, its quality has also been reduced. Smell standard phosphate fertilizer is slightly sour, if there is no smell, it means that the amount of sulfuric acid used in the production process is insufficient, the reaction is not complete, and the effective ingredient is low. If the sour taste is too strong, it means that the content of free acid is too high, the fertilizer efficiency is low, and after use, it will inhibit the activity of soil microorganisms, burn the roots of seedlings, and even cause seeds not to germinate. Generally speaking, the water content of standard phosphate fertilizer is 8% to 14%. It feels cool after touching with hands, but there are no water marks. If the water comes out after pinching by hand, it shows that the water content is too high and the quality of phosphate fertilizer is poor. If the hand feels like dry soil, it means that the acid treatment is not thorough and the content of available phosphorus is low. Sampling and testing. Through sampling and testing by designated relevant departments, the effective content, water content and free acid content of phosphate fertilizer were determined to identify the authenticity of phosphate fertilizer.
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How to distinguish the good from the bad of phosphate fertilizer
August to October is the suitable sowing time for autumn crops in the south, such as rape, broad beans, green manure, potatoes and a variety of autumn vegetables. Experienced farmers understand that autumn sowing crops emphasize the application of phosphate fertilizer, which is based on the causal relationship among crops, soil and fertilizer.
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Excessive application of phosphate fertilizer does many harm
1. Due to soil application. There is a close relationship between soil conditions and the efficiency of phosphate fertilizer. In the soil with low content of organic matter and available phosphorus, the application of phosphate fertilizer to most crops can increase the yield. Therefore, phosphate fertilizer should be mainly distributed in the soil with low organic matter content and phosphorus deficiency in order to give full play to the fertilizer effect. Such as red soil dry field, yellow mud field,.
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