CS223077B1 - A method of preparing liquid trace fertilizer - Google Patents

Abstract

A method of preparing zinc-containing liquid trace fertilizer by reacting 100 parts by weight of ammonium sulfate and / or ammonium nitrate and / or ammonium chloride with 28.1 to 84.2 parts by weight of Lormaldehyde in an aqueous medium and 12.7 to 117% by weight. , 2 parts by weight of zinc oxide and / or zinc hydroxide and / or zinc carbonate and from the reaction mixture, the zinc-containing liquid trace fertilizer is separated.

Description

223077

BACKGROUND OF THE INVENTION The present invention relates to a process for the preparation of a liquid trace fertilizer comprising a zinc reaction of zinc oxide and / or zinc hydroxide and / or carbonates with formaldehyde and ammonium sulfate and / or ammonium chloride and / or ammonium chloride.

In addition to basic nutrients, nitrogen, phosphorus and potassium, biogenic and trace elements are also indispensable for the harmonious development of plants. Zinc is one of the most important micronutrients involved in the enzymatic processes controlling the metabolic activity in plants and promotes the formation of auxin-growth stimulators.

In addition to these functions, zinc affects oxidative processes, amino acid transformation, sugar consumption, and total nitrogen metabolism.

According to the Janitor, zinc is a component of the enzyme carboanhydrase, which catalyzes the reversible reaction of H2CO3 CO2 + H2O.

Zinc-phosphorus correlation is also known. Zinc promotes phosphorus uptake by plants, this synergism is evident in case of zinc and orthophosphates, respectively. polyphosphonates. Zinc assimilability greatly depends on the soil reaction. In neutral and alkaline soils there is a risk of insoluble azinate phosphates. The application of Zn is therefore usually effective in combination with nitrogen fertilizers having an acidifying effect. The advantage of applied zinc is that the carbon black does not leach out of the system and do not observe signs of toxicity when overdosed.

A characteristic feature of zinc deficiency is chlorosis accompanied by braking, glowing leaves. Zinc deficiency causes a decrease in the formation of triptofane, which may even decompose the growth promoters and reduce the formation of organic acids from carbohydrates by the β-indolylacetic acid intermediate. Zinc-sensitive cultures are mainly maize, fauna, hops, vine, soy, apple, cherry, peach, citrus.

Zinc sulfate, zinc chloride, zinc oxide, and zinc-containing formulations of chelates (using chelating agents EDTA, DTPA, condensed phosphates) are recommended for aligning zinc deficiency disorders, with motility in the pod being substantial. higher than the mobility of zinc ionic compounds.

The recommended dose of zinc that is most commonly applied in the form of spraying is 2.2 to 11.2 kg of Zn per hectare of soil, depending on the soil, plant and application technique.

The ways of producing foliar fertilizers and zinc-containing liquid concentrates

For example, U.S. Pat. No. 4,025,330 (1977), U.S. Pat. 4,219,348 (1980); pat. 1364 464, Eng. pat. 1,094,781.

It has now been found that zinc-containing liquid trace fertilizer can be prepared by the process of the invention.

The invention is based on the fact that 100 parts by weight of ammonium sulphate and / or ammonium nitrate and / or ammonium chloride are not reacted with 28.1 to 84.2% by weight of formaldehyde and 12.7 to 117.2% by weight in aqueous medium. zinc oxide and / or zinc hydroxide and / or zinc carbonate, and from the reaction mixture, a zinc-containing trace fertilizer by sedimentation and / or filtration or centrifugation.

The reaction of the ammonium salt with formaldehyde results in hexamethylenetetramine and releases sulfuric acid, nitric acid or hydrochloric acid, which decomposes the zinc oxide or zinc hydroxide or zinc carbonate. The reaction is weakly exothermic and practically autothermal.

The main advantage of the process according to the invention is that it allows the use of relatively dilute ammonium sulphate solutions, ammonium nitrate or ammonium chloride in a technologically and energy-saving manner, or a mixture thereof for the transfer of insoluble zinc compounds to a water-soluble compound. Another advantage of the present invention is that the fertilizer contains, in addition to the zinc microelement, the macronutrient nitrogen in the form of hexamethylenetetramine, which acts as a slow absorbable nitrogen. The following examples illustrate but do not limit the invention. Example 1

17.26 parts by weight of pure zinc oxide were added to a three-necked flask equipped with a stirrer, a thermometer and a low-temperature condenser, 72 parts by weight of water and 28.0 parts by weight of ammonium sulfate were added. 46 parts by weight of sodium formaldehyde solution (37.8% CH 2 O) and the reaction mixture was allowed to react at 32 ° C for 4 hours. After this time, the solid phase was filtered off. 129.32 parts by weight of the filtrate were obtained, which contained: 6.57% Zn, 9.65% SO42, 5.26% hexamethylenetetramine, respectively. 2.10% nitrogen, d20stc = 1238.6 kgm-3, pH = 5.4. Example 2

The procedure analogous to Example 1 only

Claims (4)

SUBJECT Process for preparing a zinc-containing liquid trace fertilizer, characterized in that 100 parts by weight of ammonium sulfate and / or ammonium nitrate and / or ammonium chloride are reacted in an aqueous medium with 28.1 to 84.2 parts by weight of formaldehyde and 12, 7 to 117.2 parts by weight of zinc oxide and / or zinc hydroxide and / or zinc carbonate and from the reaction mixture the zinc-containing liquid trace fertilizer is separated.