Single fertilizer can not be mixed and applied
Some large planters in the Northeast have liked to apply their own mixed fertilizers in recent years, but they often encounter various unpredictable problems during the mixing process . In order to help farmers overcome the technical obstacles related to the mixed application of fertilizers, the principles of common mixed fertilizers are briefly described below.
The most important problem encountered with mixed fertilizers in mixed application is the defects from their physical properties, resulting in inconveniences in storage, transportation and field application . For example, agglomeration, dust, secondary separation of particles and water absorption are too large. Therefore, growers need to understand the physical properties of common nitrogen, phosphorus and potassium fertilizers, especially hygroscopicity, agglomeration and particle size, and pressure resistance .
The smaller the hygroscopicity and agglomeration of the fertilizer, the better. Hygroscopicity refers to the ability of the fertilizer to absorb moisture in the air. Caking absorbent particle surface about a single fertilizers, fertilizers large hygroscopicity caking easy. These two properties are very unfavorable for the storage, transportation and application of fertilizers. The principle of fertilizer application requires that the hygroscopicity and agglomeration of the mixture be as small as possible.
However, most water-soluble fertilizers absorb the moisture of the air more or less, but the differences between different varieties are very large. It is indicated by the moisture absorption point at normal temperature that a low moisture absorption point indicates that the hygroscopicity is large and the fertilizer is easily deliquescent. Among the common chemical fertilizers, calcium nitrate and ammonium nitrate are the lowest ( 42.7% , 66.5 % , respectively ); ammonium chloride, urea, potassium chloride are medium ( 79% , 82% , 84% ); ammonium sulfate, superphosphate Calcium and potassium sulfate are higher ( 86% , 91% , 95% ). The above data is the hygroscopic point of the simple fertilizer. When the fertilizer is mixed, the hygroscopicity is more obvious than that of the simple substance , and it is easier to absorb water and deliquesce.
Chemically compatible should be selected elemental fertilizer mixed fertilizer mixture of two or more elemental process tends to produce some chemical reactions, and some of these reactions are benign, it can lead to some increase in hygroscopicity caking or cause nutrients to be effective Fixed to reduce fertilizer efficiency. Therefore, it is necessary to select a chemically compatible elemental fertilizer for mixed application.
If two chemical fertilizers that are not chemically miscible are blended together, heat, humidity, gas evolution or agglomeration will occur. For example, general, and calcium carbonate can lead to loss of ammonia mixed; urea nitrate is completely incompatible with two single fertilizers, if they were mixed stack, which is greatly enhanced after mixing hygroscopicity, even melt phenomenon Unable to apply. Urea and superphosphate fertilizers are two limited mixing, the mix can now active, can not be stored. Especially in the summer high temperature and high humidity season, the soil can not be waited overnight after being mixed into the soil. If both coexist overnight, mixed materials will slowly become mushy deliquescence. In the compound fertilizer processing plant, the free acid in the superphosphate is neutralized with ammonium to form ammoniated superphosphate, which can be mixed with urea.
The mix of common elemental fertilizers can be found in the table below, and relevant information can be found on the table. In the common elemental nitrogen fertilizer and phosphate fertilizer, the material of the superphosphate mixed with ammonium sulfate is good and can be directly used as seed fertilizer or base fertilizer; while the superphosphate and ammonium bicarbonate are limited, the two must be mixed in a certain proportion. And use it as a base fertilizer, do not store. The optimum ratio of the two is that the superphosphate:ammonium hydrogencarbonate is approximately equal to 7 : 3 ; if the ammonium carbamate is too much, the proportion of water-soluble phosphorus in the superphosphate is easily lowered. More phosphate fertilizer can be applied to the soil as a base fertilizer at one time, while less ammonium carbonate can be reserved for later fertilizer application.
Mixing fertilizers should be matched with several granular fertilizers. During storage, transportation and application, delamination may occur, resulting in uneven fertilization and poor fertilizer efficiency. The delamination problem is related to the uneven size of different fertilizer particles. Therefore, the particle size of the fertilizer to be mixed should be controlled, and only the mixed fertilizer with the same particle size can achieve uniform fertilization, and the fertilizer efficiency can be guaranteed.
Manganese Sulphate,Manganese Monosulphate,Sulfuric Acid Manganese Salt
Sodium Tripolyphosphate,Sodium Hexameta Phosphat Co., Ltd. , http://www.chphosphate.com