What kinds of chemical fertilizer can be mixed with plant ash? In order to save cost and effectively improve the mountain soil, I plan to mix plant and wood ash (turf mud) with chemical fertilizers, but experienced fruit growers say that the plant ash cannot be mixed with ammonium bicarbonate, because monobasic acid will neutralize the reaction; Because calcium contains free acids and cannot be mixed with them, I would like to consult experts. Is this really the case? If so, which type of fertilizer should I mix with?
Ash fertilizer can be divided into straw ash, wood ash and vegetation ash fertilizer. The nutrient elements containing phosphorus pentoxide, potassium oxide and the like are as follows: straw ash, 2.11% to 2.36%, 8.09% to 10.2%; wood ash: 3.1% to 3.41%, 5.92% to 12.4%; plant ash: 3.5%, 7.5% . In addition, plant ash also contains more than 0.9% calcium oxide. As the potassium contained in the plant ash is mainly potassium carbonate, which is an alkaline fertilizer, potassium carbonate and ammonium nitrate react with the volatile ammonia and produce a loss of nitrogen. Therefore, plant ash should not be mixed with farmyard fertilizer and ammonium nitrogen fertilizer. If not with ammonium ammonium chloride, ammonium sulfate, ammonia and other mixed use. In addition, although urea acid basic is a neutral organic nitrogen fertilizer, urea is hydrolyzed into ammonium carbonate or ammonium bicarbonate after it is applied to the soil. Therefore, plant ash is still not suitable for use with urea.
As for the mixed use of plant ash and superphosphate. The main reaction product of potassium superphosphate (Ca(H2PO4)3H2O) and potassium carbonate (K2CO3) in plant ash is potassium dihydrogen phosphate (KH2PO4). Part of potassium sulfate superseded in superphosphate reacts with potassium carbonate in plant ash. Potassium sulfate (K2SO4) is formed. Both potassium dihydrogen phosphate and potassium sulfate are soluble in water and are easily absorbed by plants. However, during the chemical reaction of superphosphate and potassium carbonate in plant ash, its carbonate and calcium ions will synthesize calcium carbonate. Calcium carbonate is an insoluble compound.
Therefore, the mixed use of plant ash and superphosphate should be followed with mixing, otherwise, it is easy to produce agglomeration and reduce the fertilizer efficiency. Although, plant ash should not be mixed with livestock manure, human waste, ammonium nitrogen fertilizer. However, in the case of the cultivation of fruit trees grown in mountainous areas, organic fertilizers and ash can be applied in layers. In this way, even if the two fertilizers come in contact with the ammonia gas generated after the exposure, as long as the soil is applied after the timely application, the loss of nitrogen caused by running or volatilization of the nitrogen will be greatly reduced.
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