JP2006342028A - Fertilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cyanamide-containing fertilizer improved in the fertilizer effect of nitrogen. <P>SOLUTION: The fertilizer comprises cyanamide and humic acid and or a material containing the humic acid. It is preferable that the content of the cyanamide is 2-15 mass% and the content of the humic acid or the material containing the same is 98-85 mass%. It is preferable that the fertilizer is granulated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fertilizer.

Conventionally, a liquid fertilizer composed of a cyanamide-containing solution has been proposed (Patent Document 1), but nitrogen fertilizer was not sufficient. Humic acid, on the other hand, is a naturally-occurring macromolecular organic substance useful for plant growth, and is known to have actions such as preventing fixation of phosphoric acid to the soil, improving root vitality, and improving soil fertilizer. However, it is not certified as a fertilizer component by the Fertilizer Control Law. However, a humic acid bitter fertilizer in which humic acid and a bituminous component are mixed using such advantages of humic acid is commercially available. Humic acid bitter fertilizer is produced by, for example, reacting young charcoal such as lignite and grass charcoal with nitric acid to artificially produce humic acid and neutralizing it with a basic magnesium-containing substance (patent document) 2).
JP 9-328383 A Japanese Patent Publication No. 40-14122

  An object of the present invention is to provide a cyanamide-containing fertilizer having an improved nitrogen fertilization effect.

  The present invention is a fertilizer comprising cyanamide and humic acid or a content thereof. It is preferable that the content of cyanamide is 2 to 15% by mass and the content of humic acid or its content is 98 to 85% by mass. These fertilizers are preferably granulated.

  According to the present invention, a cyanamide-containing fertilizer having improved nitrogen fertilization effect is provided. In addition, by granulating, a cyanamide-containing fertilizer with improved nitrogen fertilization effect that is easy for fertilization work with less dusting is provided.

  Humic acid (also referred to as “humic acid”) or its contents include, in addition to naturally occurring natural humic acid, oxides of young charcoal such as lignite and grass charcoal, or young charcoal and nitric acid and / or Alternatively, humic acid-containing materials such as a reaction product with sulfuric acid can be exemplified, and at least one selected from these can be used. Moreover, as cyanamide, what was extracted from lime nitrogen etc. is used, for example. In order to mix cyanamide and humic acid or a content thereof, it is desirable to use cyanamide as an aqueous cyanamide solution, and its concentration is preferably 5 to 50% by mass, particularly 20 to 40% by mass.

  As for the content ratio of cyanamide and humic acid or its content, cyanamide is preferably 2 to 15% by mass, particularly 4 to 8% by mass, and humic acid or its content is preferably 98 to 85% by mass, particularly 96 to 92%. It is preferable that it is mass%. When a cyanamide aqueous solution is used as the cyanamide, the fertilizer contains moisture, but there is no problem if the moisture content is up to 25% by mass. When granulating fertilizer, moisture functions as a binder, so a moisture content of 10-20% by weight is rather preferable. If water content is a problem in terms of storage stability, etc., it is dried and removed. The fertilizer of the present invention may contain fertilizer components such as phosphoric acid and potassium.

  The fertilizer of the present invention is preferably granulated. This provides a cyanamide-containing fertilizer with further improved nitrogen fertilization. The granulation can be performed by, for example, a rolling granulation method, an extrusion granulation method, or the like. The average particle size of the fertilizer is preferably 2 to 4 mm.

Example 1
70 parts by mass of a humic acid-containing product composed of a reaction product of lignite and nitric acid and 30 parts by mass of a cyanamide-containing solution (cyanamide component concentration: 15% by mass) are mixed, and the content of the humic acid-containing product is 70% by mass, cyanamide A fertilizer having a content of 4.5% by mass and a water content of 25.5% by mass was produced. The cyanamide-containing solution used was prepared by adjusting the pH to 5 by mixing the filtrate with acetic acid and blowing carbon dioxide while stirring lime nitrogen and water.

Example 2
The fertilizer manufactured in Example 1 was granulated with an inclined dish granulator, the average particle size was 3.0 mm, the content of humic acid-containing material was 75 mass%, the cyanamide content was 5 mass%, and the moisture content 20% by mass of granulated fertilizer was produced.

Example 3
Instead of humic acid-containing material, Chinese natural humic acid is used, the average particle size is 3.0mm, the content of humic acid-containing material is 74% by mass, cyanamide content is 7% by mass, moisture content is 19% by mass A fertilizer was produced in the same manner as in Example 2 except that the granulated fertilizer was used.

Example 4
Instead of humic acid-containing material, grass charcoal air oxide is used, the average particle size is 3.0 mm, the content of humic acid-containing material is 78% by mass, the cyanamide content is 4% by mass, and the water content is 18% by mass. A fertilizer was produced in the same manner as in Example 2 except that it was a granulated fertilizer.

Comparative Example 1
A cyanamide aqueous solution having a cyanamide concentration of 15% by mass was used as a fertilizer.

  450 g of light-colored black soil, equivalent to 100 mg of the above fertilizer as a nitrogen component, cultivated soil consisting of 0.5 g of superphosphate and 0.2 g of potassium chloride is put in a pot and immediately seeded with 20 komatsuna. Cultivation was carried out for 28 days, and the germination rate (rate of germination among the sown seeds), the weight of the above-ground part (the weight of the leaf stem of the above-ground part), and the presence or absence of chemical damage (determined by the appearance of the leaves) were measured. The results are shown in Table 1. In addition, the presence or absence of phytotoxicity was evaluated by four-stage evaluation by visual observation: 0: no spots / dead at all, 1: spotted / bleeded, 2: leaf edge withered, 3: dead, The average score was evaluated.

  From the comparison between Examples and Comparative Examples, according to the fertilizer of the present invention, even when sowing and planting immediately after fertilization, the germination rate does not deteriorate, and further, no phytotoxicity such as spots or withering occurs during the cultivation period. Komatsuna was cultivated. Moreover, from comparison of Example 1 and Example 2, by granulating the fertilizer, the weight of the above-ground part became heavier and it became a fertilizer with still greater fertilizer effect.

Claims (3)

A fertilizer comprising cyanamide and humic acid or its inclusions. A fertilizer comprising 2 to 15% by mass of cyanamide and 98 to 85% by mass of humic acid or a content thereof. The fertilizer according to claim 1 or 2, wherein the fertilizer is granulated.