Precautions for chemical fertilizer preservation in rainy season

2018-10-03 12:02:28
Fertilizer production is carried out continuously throughout the year, and the use of fertilizers is seasonal. Therefore, storage before chemical fertilizer application is an indispensable link. Fertilizers may be stored in the hands of factories, wholesalers or distributors. In agricultural production, the seasons that require fertilization are mostly distributed in spring sowing, summer forced and autumn sowing seasons, which form the peak season of fertilization and off season. The storage of chemical fertilizers is very prone to problems during the hot and rainy seasons, especially the storage of nitrogen fertilizer. In the rainy season, the storage of chemical fertilizers is mainly the problem of moisture absorption and agglomeration of chemical fertilizers. After agglomeration, the commercial properties of the fertilizer deteriorated, making it difficult to achieve mechanical application. Farmers are reluctant to buy, even if the price is reduced, the farmers take it back, increasing the labor of broken and agglomerated, and manpower fertilization is difficult, and uneven application will burn the seedlings.

The precursor to fertilizer agglomeration is to absorb the moisture in the air, which is the hygroscopicity of the fertilizer. It can be said that the hygroscopicity of chemical fertilizers (especially nitrogen fertilizer) is the bane of agglomeration, and the quantitative indicator for measuring the hygroscopicity of nitrogen fertilizer is the critical relative humidity.

The so-called "critical relative humidity of fertilizer" refers to the relative humidity of the atmosphere when the fertilizer is exposed to the air at a certain temperature (30" C). The moisture absorption is proportional to the agglomeration.

The hygroscopicity of chemical nitrogen fertilizer varies from species to species. The hygroscopicity of common nitrogen fertilizer varieties, ie critical relative humidity, is as follows: ammonium nitrate (59.4) < urea (72.5) < ammonium sulfate (79.2). It can be seen that ammonium nitrate is the most hygroscopic in these nitrogen fertilizers, and urea has a strong hygroscopicity.

In addition to the internal factors of fertilizer varieties, the external factors that affect moisture absorption and agglomeration are humidity and temperature. Summer is both hot and rainy, and storage is very difficult.
【Comment】 【Print this article】 【Close this page】 【Large, medium and small】

Old VAT dye VAT dye, insoluble in water, in the alkaline solution by sodium dithionite reduction processing powder (insurance), and make the fiber dyeing dye. Its fast and washing fastness especially, can be used for cotton, linen, viscose, whalen fiber dyeing and printing, etc.

In the molecular structure of VAT dye excluding sulfonic group, carboxylic acid base, such as water soluble groups, insoluble in water, therefore, cannot be directly dyed; The molecular conjugated double bond systems containing at least two carbonyl, interaction with insurance powder in the alkaline solution, carbonyl reduction into hydroxyl, become water soluble compounds ─ ─ the leuco body. Is leuco body has affinity to fiber, fiber after adsorption, oxidized by air or other oxidants, leuco body back for VAT dye fixation on fiber staining. Leuco body staining method shortcoming is dye into the fibers not easily, if the suspension pad dyeing, the reduction of the outstanding dye made from suspension solution, borrow machine rolling pressure make dye fine, evenly distributed on the dyed fabric treated with insurance powder and make dye reduction by fiber adsorption, good is thicker and uniform can be obtained by the oxidation dyeing effect.

Its chromatographic is full, bright color, soaping, tanning fastness are high, but because the price is more expensive, some yellow, orange and other color with photosensitivity brittle damage phenomenon, make its application is limited by certain.

Because Vat Dyes does not dissolve in water, so the side effects of it on the human body easy to control, more safe and convenient for environmental protection, but its cost is generally high.

Vat Dyes

Vat Dyes, Vat Red Dyes, Vat Dyes Manufacturer

Dynasty Chemicals (NingBo) Co., Ltd. , http://www.dychemco.com