JP2006193368A - Nitrogenous fertilizer composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nitrogenous fertilizer which has an extended period of ammonia nitrogen in soil. <P>SOLUTION: The nitrogenous fertilizer composition comprises calcium aluminate. The nitrogenous fertilizer composition comprises 3-30 mass% of calcium aluminate containing 40-65 mass% of Al<SB>2</SB>O<SB>3</SB>and 35-60 mass% of CaO. The nitrogenous fertilizer composition preferably comprises nitrolime fertilizer as the nitrogenous fertilizer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nitrogen fertilizer composition.

  Nitrogen, which is one of the three elements of fertilizer, is absorbed from the roots in the form of ammonia nitrogen or nitrate nitrogen that is nitrated by microorganisms in the soil, but ammonia nitrogen has a greater fertilization effect. Ammonia nitrogen becomes a cation in the soil and adsorbs to negatively charged soil colloids, so it rarely flows away in groundwater or the like, but eventually changes to nitrate nitrogen which is an anion. Here, examples of ammonia nitrogen include ammonia, ammonium salt, urea nitrogen, organic nitrogen, ammonia nitrogen derived from cyanamide nitrogen, and the like.

In order to reduce such runaway, various proposals have been made to make the nitrogen fertilizer slow-acting. For example, it is coated with a synthetic resin, paraffins, oils and fats, sulfur or the like (Patent Document 1), or a nitrification inhibitor that suppresses the action of microorganisms is added (Non-Patent Document 1). However, today's demand is much higher, and the emergence of nitrogen fertilizer with further enhanced slow-release is awaited.
Japanese Patent Publication No.54-3104 Masanori Sanzen Research on nitrification inhibitors (I), Agricultural Technology Research Institute Report B No. 23 pp 79-146 (1972)

  The objective of this invention is providing the nitrogen fertilizer which extended the presence period of ammonia nitrogen in soil.

  The present invention is a nitrogen fertilizer composition containing calcium aluminate. Moreover, this invention is a nitrogen fertilizer composition formed by containing 3-30 mass% of calcium aluminates containing 40-65 mass% Al2O3 and 35-60 mass% CaO. In any nitrogen fertilizer composition, the nitrogen fertilizer is preferably lime nitrogen fertilizer.

  The nitrogen fertilizer composition of the present invention extends the existence period of ammonia nitrogen in the soil. As a result, the opportunity to absorb the ammonia nitrogen in the plant body is increased, so that better plant growth can be expected.

The calcium aluminate as used in the present invention means a compound containing calcium and alumina as basic components, and there are no restrictions on the amorphous, crystalline, or solid crystalline form. For example, C represents CaO, A represents Al2O3, calcium aluminate such as C3A, CA, C12A7 and CA2, amorphous calcium aluminate having these compositions, and further fluorine, chlorine, etc. A solid solution of calcium aluminate in which an alkali metal element such as a halogen element or sodium is dissolved, and one or more of these are used. The chemical composition is preferably a calcium aluminate containing 40 to 65 mass% Al2O3 and 35 to 60 mass% CaO, particularly preferably 45 to 65 mass% Al2O3 and 35 to 55 mass% CaO. The brane fineness is preferably 2000 to 5000 cm ² / g.

  Calcium aluminate can be produced by a conventional method. For example, a mixed raw material of calcareous materials such as limestone and carbide lime and alumina materials such as bauxite, high alumina, and purified alumina can be manufactured by heat treatment such as baking or melting. A typical commercial product of calcium aluminate is alumina cement, which is one of the preferred examples in the present invention.

  The content of calcium aluminate is preferably 3 to 30% by mass, and particularly preferably 5 to 20% by mass, in the nitrogen fertilizer composition of the present invention. This further increases the effect of extending the duration of the presence of ammonia nitrogen in the soil.

  The nitrogen fertilizer containing calcium aluminate is not particularly limited. For example, a conventional nitrogen fertilizer containing 3% by mass or more of nitrogen is used. Illustrative examples include nitrogenous fertilizers, organic fertilizers, and complex fertilizers. Specific examples include lime nitrogen, urea, ammonium sulfate, ammonium sulfate, ammonium nitrate, lime nitrate, phosphorus ammonium, sodium nitrate, nitrate bitter soil. Fertilizer, ammonium humate fertilizer, urea form, condensate of urea and isobutyraldehyde, condensate of urea and acetaldehyde, sulfate of dicyandiamide hydrolyzate, phosphate of dicyandiamide hydrolyzate, condensate of oxalic acid and ammonia. These nitrogen fertilizers are used singly or in combination of two or more. Among them, lime nitrogen is preferred because it tends to increase the effect of extending the duration of ammonia nitrogen in the soil.

  The nitrogen fertilizer composition of the present invention contains, for example, calcareous substances such as blast furnace slag, steelmaking slag, fly ash and limestone, and trace components necessary for the growth of plants such as manganese, iodine, boron and phosphoric acid. You can also. The form of the nitrogen fertilizer composition of the present invention is preferably 0.5 to 10 mm in granular form, pellet form, or the like from the viewpoint of reducing applied dust generation.

Example 1
Lime nitrogen (trade name “lime nitrogen” manufactured by Denki Kagaku Kogyo Co., Ltd., containing 24% by mass of cyanamide nitrogen) 23.1% by mass, urea 11.5% by mass, calcium carbonate powder 53.9% by mass, soybean Hardened oil 1.5% by mass, commercially available alumina cement (CaO 38.3% by mass, Al2O3 53.2% by mass, the balance being SiO2, TiO2, etc., and brane fineness 3500 cm ² / g) Mass% was mixed and extrusion molding was performed to produce a pellet-shaped nitrogen fertilizer composition (nitrogen content was 10 mass%, average particle diameter was 3 mm, and average length was 5 mm). The ammonia digestion test of the obtained nitrogen fertilizer composition was conducted according to the following. The results are shown in Table 1.

Ammonia nitrification test Under conditions of 25 ° C., 30 g of dry soil made of surface humic black soil and water were added to a 70 ml plastic bottle. The amount of water used was 60% by mass of the maximum water volume of the surface humic black soil. Next, 60 mg of a nitrogen fertilizer composition was buried in the approximate center of the soil with tweezers and covered with aluminum foil. Thereafter, the plastic bottle is placed in a constant temperature bath at 20 ° C., and ammonia in the soil is extracted and filtered with 150 ml of 1N potassium sulfate every time, and 0.2 ml of 10N sodium hydroxide is added dropwise to 20 ml of the filtrate. It was made alkaline, ammonium ions in the filtrate were quantified using an ion electrode, and the amount of nitrogen in the form of ammonia was measured.

Example 2
Except for using calcium aluminate with a calcium fineness of 4100 cm ² / g, CaO 33.5% by mass, Al2O3 49.8% by mass, the balance being SiO2, TiO2, etc. as calcium aluminate In the same manner as in No. 1, a pellet-shaped nitrogen fertilizer composition was produced.

Example 3
Implemented except that 36.2% by weight of molten phosphorus (trade name “Yorin” manufactured by Hinode Chemical Co., Ltd.) and 17.7% by weight of potassium chloride powder were used instead of 53.9% by weight of calcium carbonate powder. In the same manner as in Example 2, a pellet-shaped nitrogen fertilizer composition (10% by mass of nitrogen, 7% by mass of phosphoric acid, 10% by mass of potassium, average particle size of 3 mm, average length of 5 mm) was produced. did.

Example 4
The test was conducted in the same manner as in Example 1 except that medium coarse brown low-lying soil was used as the dry soil.

Comparative Example 1
A pellet-shaped nitrogen fertilizer composition was produced in the same manner as in Example 1 except that quartz sand (brane fineness: 3200 cm ² / g) was used instead of alumina cement.

Comparative Example 2
A pellet-shaped nitrogen fertilizer composition was produced in the same manner as in Example 3 except that quartz sand (brane fineness: 3200 cm ² / g) was used instead of calcium aluminate.

Comparative Example 3
The test was conducted in the same manner as in Example 4 except that quartz sand (brane fineness: 3200 cm ² / g) was used instead of alumina cement.

  The nitrogen fertilizer composition of the present invention can be used as a nitrogen fertilizer.

Claims (3)

  A nitrogen fertilizer composition containing calcium aluminate.   A nitrogen fertilizer composition comprising 3 to 30% by mass of calcium aluminate containing 40 to 65% by mass of Al2O3 and 35 to 60% by mass of CaO.   The nitrogen fertilizer composition according to claim 1 or 2, wherein the nitrogen fertilizer is lime nitrogen fertilizer.