JPH06293583A - Silica fertilizer for mechanical spraying - Google Patents

Abstract

PURPOSE:To provide a silica fertilizer which shows the same fertilizing effect as that of a conventional technique and is hardly scattered at the time of mechanical spraying. CONSTITUTION:Granules of porous calcium silicate hydride is used as the silica fertilizer for mechanical spraying. This fertilizer has 50-90% porosity and >=70% of granules have 0.85-8.0mm grain size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to siliceous fertilizers, and more particularly to granular fertilizers comprising porous calcium silicate hydrate granules obtained by a specific method.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a siliceous fertilizer, a siliceous fertilizer made of porous calcium silicate hydrate is known. For this siliceous fertilizer,
Emphasizing the fertilizing effect, a relatively small particle size was used which passed through a 2.00 mm mesh sieve and passed through a 600-micron mesh sieve by 60% or more. However, when this fertilizer was sprayed by a sprayer, there was a problem that the fertilizer was easily scattered because it had a small particle size and a low bulk specific gravity, and was difficult to spray to a predetermined place.

Therefore, as a result of diligent research by the present inventors to find out a siliceous fertilizer that does not easily scatter even when sprayed, it is surprising that the siliceous fertilizer has a larger particle size than the known siliceous fertilizer. However, the present invention has been completed by finding the fact that if it has a specific porosity, the fertilizing effect is exerted similarly to the conventional siliceous fertilizer, and further, it is difficult to be scattered during spraying. Therefore, an object of the present invention is to provide a siliceous fertilizer which exhibits fertilizing effect equivalent to that of the conventional technique and is less likely to be scattered during spraying.

[0004]

In order to solve the above problems, the present invention comprises porous calcium silicate hydrate granules having a porosity of 50 to 90%, 70% or more of which is 0.85 to 0.85.
The siliceous fertilizer has a particle size in the range of 8.0 mm.

[0005]

Since the siliceous fertilizer according to the present invention has a large porosity of 50 to 90%, it has a large contact area with the external environment. Therefore, even if the particle size is increased, it is not inferior to conventional siliceous fertilizers. Exert its effect. Since it has a specific particle size, it hardly scatters during spraying.

[0006]

EXAMPLES Examples of the present invention will now be described in detail. [Manufacturing Method] 7 parts by weight of water was mixed with 5 parts by weight of silica stone, 2 parts by weight of calcareous powder, and 3 parts by weight of ordinary Portland cement, and 0.008 parts by weight of metallic aluminum powder. The water slurry thus obtained was poured into a mold and allowed to stand for 4 hours, and then the foamed cured product obtained by demolding was subjected to hydrothermal synthesis treatment at 180 ° C. for 10 hours at 10 atm in an autoclave. .

The obtained product contained many fine pores, and its porosity was 88% as measured. The porosity was measured by measuring the specific gravity (ρ1) of a molded product (which does not contain pores) obtained by the same method as above in the absence of aluminum metal and the specific gravity (ρ) of the product containing the pores.
2) was measured and the ratio (ρ2 / ρ1) was calculated.

Next, the product obtained in this example was roughly crushed with a crusher, and the crushed product was sieved to obtain granular fertilizers (trade name Ininica) having various particle sizes. Then, 200 g of a test soil (mineral acid yellow soil / Toyohashi City) and 200 g of quartz sand were packed in a Neubauer pot (made of plastic) together with an amount of these granular fertilizers as soluble silicic acid corresponding to 200 mg.

Further, monoammonium phosphate, ammonium sulfate and potassium chloride fertilizers were selected as common fertilizers so as to contain 30 mg of nitrogen, phosphoric acid and potassium, and their aqueous solutions were added to the pot. Neubauer pots filled with fertilizer and soil prepared in this way (test zone 0
~ 7), 100 seeds of rice of the variety "Nihonbare" soaked in water all day and night were sown, and the rice was grown for 22 days. After that, the rice planted above the ground was cut, and the weight of the rice plant before and after drying and the content rate of the silicic acid absorbed in the rice plant were quantified, and the silicic acid absorption amount and utilization rate were calculated. As a result, the particle size and the weight of the siliceous fertilizer according to the present invention,
The relationship between the content rate, absorption amount and utilization rate is as shown in the table. Separately from the experiment of the test section, when the application of the siliceous fertilizer of the present invention was tried on a paddy field in a windless state with a broadcaster spreader, the fertilizers of the test sections 1 to 6 almost rose around the spreader. It never happened.

[0010]

【table】

[0011]

Comparative Examples 3 and 4 Instead of the siliceous fertilizer according to the present invention used in the above examples, a blast furnace (water granulated) slag siliceous fertilizer “Keikaru” having a particle size of 2 mm or less was dissolved in the same amount as in the above examples. A comparative experiment was carried out according to the above-described example using silicic acid (Comparative Example 3 / Test Group 8).
An experiment was also conducted in the case where no siliceous fertilizer was used (Comparative Example 4 / Test section 9). The results are shown together in the above table.

As is apparent from the table, when the siliceous fertilizer of the present invention is used, the amount of silicic acid absorbed tends to increase as the particle size becomes finer, but the maximum particle size is 6.7 to 8.0.
Even in mm, it exceeds the absorption amount of the blast furnace slag of Comparative Example 3 fertilized so that the same amount of soluble silicic acid is contained.

The present invention is not limited to the above-described embodiments, but the embodiments can be modified within the scope of the basic technical idea and the effects thereof are not significantly impaired. For example, not only can it be used as a simple fertilizer, but it can also be used as a compound fertilizer. In this case, the blending ratio is 50% by weight or less.

The fertilizer of the present invention is most effective in
Plants that require silicic acid, such as rice, wheat, corn,
Grass and feed crops, especially rice.

Further, the lower limit of the particle size of the siliceous fertilizer according to the present invention is experimentally determined based on the sieve opening specified by JIS, and sieves having various openings are prepared. Since it has not been determined, fertilizers having a particle size slightly smaller than 0.85 mm can be the subject of the present invention when the effects of the present invention are exhibited.

[0016]

As described in detail above, since the present invention has a large porosity in spite of a large particle size, it exhibits a fertilizing effect equivalent to that of a conventionally known siliceous fertilizer and can be applied to paddy fields by a sprayer. It has an excellent effect that it does not easily scatter even when sprayed.

[Procedure amendment]

[Submission date] September 28, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The present invention is not limited to the above-described embodiments, but the embodiments can be modified within the scope of the fundamental technical idea and the effects thereof are not significantly impaired. For example, not only can it be used as a simple fertilizer, but it can also be used as a compound fertilizer.
In this case, the blending ratio is 50% by weight or more . ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

[Title of the Invention] Silica fertilizer for mechanical spraying

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to siliceous fertilizers, and more particularly to a granular fertilizer for mechanical spraying, which comprises porous calcium silicate hydrate granules obtained by a specific method.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a siliceous fertilizer, a siliceous fertilizer made of porous calcium silicate hydrate is known. For this siliceous fertilizer,
Emphasizing the fertilizing effect, a relatively small particle size was used which passed through a 2.00 mm mesh sieve and passed through a 600-micron mesh sieve by 60% or more. However, when this fertilizer was mechanically sprayed, there was a problem that the fertilizer was easily scattered because it had a small particle size and a low bulk specific gravity, and was difficult to be sprayed to a predetermined place.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Therefore, the inventors of the present invention have conducted diligent research to find a siliceous fertilizer that does not easily scatter even when mechanically sprayed .
Surprisingly, even a siliceous fertilizer having a larger particle size than the known siliceous fertilizer having a specific porosity,
Fertilizer efficiency is also exhibited in the same manner as conventional siliceous fertilizers, moreover, machine
The present invention has been completed by discovering the fact that it is difficult to scatter during mechanical spraying . Therefore, an object of the present invention is to provide a siliceous fertilizer that exhibits fertilization effects equivalent to those of the prior art and is less likely to be scattered during mechanical spraying .

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

In order to solve the above problems, the present invention comprises porous calcium silicate hydrate granules having a porosity of 50 to 90%, 70% or more of which is 0.85 to 0.85.
A siliceous fertilizer for mechanical application having a particle size in the range of 8.0 mm.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

Since the siliceous fertilizer according to the present invention has a large porosity of 50 to 90%, it has a large contact area with other fields, so that even if the particle size is increased, it is not inferior to conventional siliceous fertilizers. Exert its effect. Because it has a specific particle size
It is rarely scattered during mechanical spraying .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016]

As described above in detail, since the present invention has a large porosity in spite of a large particle size, it exhibits a fertilizing effect equivalent to that of a conventionally known siliceous fertilizer and mechanically spreads on paddy fields.
It has an excellent effect that it does not easily scatter even if it is clothed .

Claims (2)

[Claims] 1. A porous calcium silicate hydrate granule having a porosity of 50 to 90%, of which 70% or more is 0.85 to 0.85.
A siliceous fertilizer with a particle size in the range of 8.0 mm. 2. A porous calcium silicate hydrate is obtained by hydrothermally reacting a foamed cured product obtained by foaming and curing an aqueous slurry composed of a siliceous raw material and a calcareous raw material in the presence of a foaming agent. The siliceous fertilizer according to claim 1.