JP2008280220A - Granular nitrogen fertilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slow acting granular nitrogen fertilizer which is inexpensive, and can be easily manufactured. <P>SOLUTION: The granular nitrogen fertilizer containing nitrolime and urea is prepared by mixing nitrolime and urea by a ratio of a nitrogen amount of nitrolime to that of urea of 1:1-3 and granulating while spraying water. The granular nitrogen fertilizer having a homogeneous constituent and an average particle size of 2-6 mm prepared by granulating using a powdery nitrolime and a powdery urea, the granular nitrogen fertilizer composed of urea covered with nitrolime by granulating using the powdery nitrolime and the granular urea, and the granular nitrogen fertilizer composed of nitrolime covered with urea by granulating using the powdery urea and the granular nitrolime are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a slow-acting granular nitrogen fertilizer.

  The slow-pouring nitrogen fertilizer was developed to compensate for the shortcomings of the fast-acting fertilizer. To date, the slow-acting fertilizer is a urea-acetaldehyde condensate that is a fertilizer with a chemical form that is difficult to decompose in soil. (CDU), urea-isobutyraldehyde condensate (IB) has been used.

  In recent years, urea coated with urea has been developed as a membrane, and the elution time can be controlled relatively closely, and even if given in large amounts, it does not cause damage due to high-concentration fertilizer components. Use is spreading.

  On the other hand, lime nitrogen is a fertilizer developed at the beginning of the 20th century, but because it has the effect of suppressing nitrification, the nitrogen produced by the decomposition of lime nitrogen remains ammonia, and it is difficult to run away and denitrify. Used for plants over a period of time.

  However, since the above-mentioned coated urea and lime nitrogen are several times more expensive than urea and ammonium sulfate, it was a great economic burden for farmers.

Patent Document 1 discloses a method of granulating lime nitrogen or the like using urea.
JP-A-7-157385

  However, this method granulates urea after being combined with lime nitrogen or the like in a molten state, and a molding machine capable of simultaneously performing pressurization and molding in order to utilize the frictional heat of the raw material mixture. It was necessary to use it, and temperature control of the molding machine was required to make urea into a molten state, which was not efficient at all.

  Accordingly, an object of the present invention is to provide a slow-acting granular nitrogen fertilizer that is inexpensive and can be easily manufactured.

  As a result of intensive studies to solve the above problems, it was found that a granular nitrogen fertilizer can be easily obtained by spraying water on a mixture of lime nitrogen and urea, and the present invention has been conceived.

  That is, the granular nitrogen fertilizer of the present invention is a granular nitrogen fertilizer containing lime nitrogen and urea, and lime nitrogen and urea so that the ratio of the nitrogen amount of lime nitrogen and the nitrogen amount of urea is 1: 1-3. And granulated while spraying water.

  According to the present invention, it is possible to provide a slow-acting granular nitrogen fertilizer that is inexpensive and can be easily manufactured.

  The granular nitrogen fertilizer of the present invention is a granular nitrogen fertilizer containing lime nitrogen and urea, and lime nitrogen and urea are mixed so that the ratio of the nitrogen amount of lime nitrogen and the nitrogen amount of urea is 1: 1 to 3 And granulated while spraying water.

  The granular nitrogen fertilizer of the present invention contains lime nitrogen and urea, and nitrification of ammonia produced by decomposition of urea and urea is suppressed by the nitrification inhibiting action of lime nitrogen. Therefore, runoff and denitrification hardly occur, and it is used for plants for a long time. In addition, the component which the granular nitrogen fertilizer of this invention contains is not limited to lime nitrogen and urea, For example, you may contain ammonium sulfate etc.

  Moreover, the granular nitrogen fertilizer of the present invention is formed by mixing lime nitrogen and urea so that the ratio of the nitrogen amount of lime nitrogen and the nitrogen amount of urea is 1: 1 to 3, and is an expensive lime nitrogen. Since the amount used is reduced, the raw material price is low.

  In addition, when the nitrogen ratio of urea exceeds 3 times the nitrogen amount of lime nitrogen, the nitrification inhibiting action of lime nitrogen is reduced. In addition, when the mixing ratio is such that the nitrogen amount of urea is less than 1 times the nitrogen amount of lime nitrogen, there is almost no difference in the nitrification inhibitory effect from the case of mixing at 1: 1. Therefore, it is preferable to mix lime nitrogen and urea so that the ratio of the nitrogen amount of lime nitrogen and the nitrogen amount of urea is 1: 1 to 3.

  Further, the granular nitrogen fertilizer of the present invention is granulated while spraying water, and it is not necessary to use a special binder, and can be easily granulated using an existing bread type granulator. , Manufacturing costs can be reduced.

  The granular nitrogen fertilizer of the present invention is formed by coating urea with lime nitrogen. By covering with lime nitrogen, elution of urea is suppressed, and as a result, the fertilization effect is sustained over a longer period.

  Furthermore, the granular nitrogen fertilizer of the present invention is formed by coating lime nitrogen with urea. Lime nitrogen is toxic, but it is coated with harmless urea to prevent fertilizer workers from coming into contact with lime nitrogen.

  Below, the manufacturing method of the granular nitrogen fertilizer of this invention is demonstrated.

  In one embodiment, powdered lime nitrogen and powdered urea are used. As shown in FIG. 1, powdered lime nitrogen 1 and powdered urea 2 are mixed so that the ratio of nitrogen content of lime nitrogen and nitrogen content of urea is 1: 1 to 3, and a mixture of powdered lime nitrogen and powdered urea. The granulated fertilizer 4 granulated from powdered lime nitrogen and powdered urea is obtained by granulating while spraying water onto this. According to this embodiment, the granular nitrogen fertilizer which has a uniform component with an average particle diameter of 2-6 mm suitable for fertilizing with a machine or human power is obtained.

  In another embodiment, powdered lime nitrogen and granular urea are used. As shown in FIG. 2, granular fertilizer 6 in which granular urea is coated with powdered lime nitrogen is obtained by mixing powdered lime nitrogen 1 and granular urea 5 and granulating the mixture while spraying water. According to this embodiment, a granular nitrogen fertilizer having a uniform particle diameter can be obtained by using granular urea having a uniform particle diameter. Moreover, in this embodiment, if granular lime nitrogen and powdered urea are used instead of powdered lime nitrogen and granular urea, the granular fertilizer which coat | covered granular lime nitrogen with powdered urea will be obtained.

  Hereinafter, the present invention will be described in detail based on specific examples. In addition, this invention is not restrict | limited by a following example.

  Powdered lime nitrogen and powdered urea were mixed in a weight ratio of 46:20 so that the ratio of the amount of nitrogen in lime nitrogen and the amount of nitrogen in urea was 1: 1. Using a pan-type granulator, granulation was performed while spraying water in a rotating container. A granular nitrogen fertilizer having a uniform component with a particle size of about 2 to 6 mm was obtained.

  Powdered lime nitrogen was added to granular urea having a diameter of about 2 mm, and water was sprayed in a rotating container using a pan-type granulator. Urea was covered with lime nitrogen, and a granular nitrogen fertilizer having a uniform particle diameter of about 3 mm in outer diameter was obtained.

  In the paddy field conversion field, the test which fertilizes by changing the mixing ratio of lime nitrogen and urea was conducted.

  "No application section" without fertilization, "urea section" of urea only, 1/4 lime nitrogen as nitrogen, "1/4 lime nitrogen section" mixed with urea 3/4, lime nitrogen 1/2 as nitrogen, A “1/2 lime nitrogen section” mixed with urea 1/2 and a “lime nitrogen section” containing only lime nitrogen were provided, and 100 kg N / ha was applied deeply 20 cm below the surface.

  The seed weight per soybean strain in the non-application area was 31.1 g, the urea area was 35.6 g, whereas the 1/4 lime nitrogen area was 37.8 g, and the 1/2 lime nitrogen area was 37.5 g. there were. Since it was 38.5 g in the lime nitrogen section, a yield increasing effect close to the lime nitrogen section was obtained in the 1/4 lime nitrogen section and the 1/2 lime nitrogen section.

  It was confirmed that when lime nitrogen and urea were mixed so that the ratio between the nitrogen amount of lime nitrogen and the nitrogen amount of urea was 1: 1 to 3, a remarkable effect of increasing the yield was obtained.

It is a schematic diagram which shows the manufacturing method of the granular nitrogen fertilizer of this invention. It is a schematic diagram which shows another manufacturing method same as the above.

Claims (4)

A granular nitrogen fertilizer containing lime nitrogen and urea, mixed with lime nitrogen and urea so that the ratio of the nitrogen amount of lime nitrogen to the nitrogen amount of urea is 1: 1 to 3, and produced while spraying water. Granular nitrogen fertilizer characterized by being granulated. The granular nitrogen fertilizer according to claim 1, wherein urea is coated with lime nitrogen. The granular nitrogen fertilizer according to claim 1, wherein lime nitrogen is coated with urea. The granular nitrogen fertilizer according to any one of claims 1 to 3, wherein an average particle diameter is 2 to 6 mm.

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