How do you judge whether phosphate fertilizer is good or bad? Here are a few practical identification methods
Topdressing with foliar fertilizer is one of the most commonly used, economical and fast-acting fertilization methods in vegetable cultivation. It involves mixing fertilizer into an aqueous solution of a certain concentration and spraying it directly onto crop leaves to make up for the insufficient nutrient supply caused by the weak nutrient uptake capacity of the roots. Extensive application has shown that topdressing with foliar fertilizer can improve vegetable yield and quality,...
Observe the color and form. Phosphate fertilizer should be grayish white and in powder form. If the color is white or yellow, it may be because the acid treatment was incomplete and its phosphorus content is low. Smell the odor. Phosphate fertilizer should have a slight sour smell. If it has no such smell, it means that the amount of sulfuric acid used in the production process was insufficient, the reaction was incomplete, and its active ingredient content is low; if the sour smell is too strong, it means the free acid content is too high, its fertilizer efficiency is low, and after application it will inhibit the activity of microorganisms in the soil, burn the seedling roots of crops, and cause consequences such as seeds failing to germinate.The moisture content of phosphate fertilizer is generally 8%-14%. After touching it with your hand, it feels cool, but there is no trace of water. If water comes out after squeezing it with your hand, it indicates that the moisture content is too high, and the quality of this kind of phosphate fertilizer is poor. If it feels like dry soil when touched by hand, it indicates that the acid treatment was not thorough and its active ingredient content is low. Sampling and laboratory testing: have the relevant departments conduct sampling and laboratory testing to determine whether the phosphate fertilizer is good or bad.