JPS627786A - Soil amending agent - Google Patents

Abstract

PURPOSE:An inexpensive soil amending agent, containing coal ash, slag and zeolite at a specific ratio, effective for not only acid soil but also alkali soil, having improved inhibitory effect particularly on nematodes and lasting effect. CONSTITUTION:A soil amending agent containing (A) 4-4.75pts.wt. coal ash, (B) 4-4.75pts.wt. slag, preferably water granulated blast furnace slag having about 0.2-2mm grain diameter and (C) 0.5-2pts.wt. preferably powdery zeolite. Preferably, the compounding ratio of the components (A) to (B) is equal weight.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an inorganic soil conditioner.

[Prior art] Soil improvement involves chemical improvement, mainly pH and inorganic nutrient balance, physical improvement, mainly water permeability, air permeability, and water retention, and biological improvement, mainly related to the activities of beneficial soil microorganisms. Improvements can be mentioned.

Although various soil conditioners have been known in the past, they all improve one or two of the above characteristics, and no one that comprehensively improves the above characteristics is known yet.

For example, methods of improving soil using slag and coal ash are known, but slag and coal ash are strongly alkaline.
Although it is useful for improving acidic soil, excessive doses often cause alkaline damage, and if the amount of slag or coal ash added is reduced in an attempt to avoid this, the soil returns to acidic soil in a short period of time, and the effect is lost. The drawback is that it does not last.

Another disadvantage of slag is that it hardens the soil due to hydraulic reactions.

Rarani slag and coal ash have a weak ability to capture fertilizers, and they also have the disadvantage that fertilizers are easily washed away by rainwater.

A known method of improving physical properties is to disperse and mix styrofoam particles into soil, but this simply creates voids in the soil, and in the event of heavy rain, etc., the voids enhance the drainage effect. The foam particles float out of the soil and flow onto the soil surface.

The soil improvement effect was lost, and the fertilizer was often washed away as well.

Therefore, it has been desired to develop a comprehensive soil improvement agent that is inexpensive, easy to use, and has excellent long-lasting effects.

[Problems to be solved by the invention] The present invention does not have the above-mentioned drawbacks of conventional soil conditioners,
The object of the present invention is to provide a soil conditioner that can improve all of the chemical, physical, and biological properties of soil.

[Means for Solving the Problems] That is, 1. The gist of the present invention is that 4 to 4.75 parts by weight of coal ash, 4 to 4.75 parts by weight of slag, and 0.5 to 2 parts by weight of zeolite.
A soil conditioner consisting of parts by weight.

The coal ash used in the present invention is rich in boron and potassium, and the slag is rich in calcium and magnesium but low in boron and potassium, so when they are combined, the fertilizer components are well balanced. However, this alone does not solve the disadvantages of easy alkali damage, hardening of soil due to hydraulic reaction, and weak fertilizer trapping ability. However, 5 to 20% of zeolite, which is said to be ineffective for soil improvement depending on the conditions, such as in the case of poor acidic soil, is added to this.
Even if the soil conditioner is added in sufficient quantity, it will not cause alkaline damage, and the alkalinity can be maintained for a long period of time.The ratio of coal ash to slag is 1:0,
It is preferable that the ratio is 5 to 2, more preferably 1:1.0 Coal ash can be used in the form of ordinary fine powder. Slag includes blast furnace slag, converter slag,
Although any electric furnace slag can be used, blast furnace slag is preferable because of its composition.The slag is preferably in the form of fine particles, and granulated slag with a grain size of about 0.2 to 2 mm is preferably used.

Zeolite in powder form is preferably used.

If the amount of zeolite added is less than 0.5%, the effect of the above-mentioned addition of zeolite will not be sufficiently exhibited, and if it is added in excess of 20%, there will be no further effect, and this will only lead to an increase in cost.

The soil conditioner of the present invention can be easily obtained by simply uniformly mixing the above-mentioned coal ash, slag, and zeolite in the above-mentioned ratio.

[Effects of the invention] The soil conditioner of the present invention has a good balance of inorganic fertilizer components because coal ash and slag are present in a suitable ratio, and since zeolite coexists, it has no alkalinity even though there is a strong alkali. It has the advantage that it does not cause any damage and the alkaline effect lasts for a long time, and it also suppresses the hydraulic reaction of the slag. Furthermore, since both coal ash and slag are exposed to high temperatures, they are usually free of harmful bacteria, and the slag after the zeolite and alkali are removed is a porous material with ion-exchange ability, so it is not harmful to the soil. When mixed, useful microorganisms can easily reproduce stably, and it is also effective in reducing problems caused by continuous cropping by preventing the generation of hydrocarbons and hydrogen sulfide that promote the growth of harmful anaerobic bacteria. Therefore, the air permeability and water permeability are moderately improved, and the ability to capture fertilizers is also high.

Since the soil conditioner of the present invention is in the form of a hygroscopic powder or sand, it can be easily administered to the soil without being excessively dispersed by wind. Therefore, it enables comprehensive soil improvement that has never been possible before.

[Example] The present invention will be explained in more detail below using examples.

Example 1 Granulated blast furnace slag (particle size 0.1 to 2 mm) 45 kg, coal ash 45 kg, zeolite (particle size 0.1 mm or less) 1
A soil conditioner was obtained by uniformly mixing 0 kg with a mixer.

This was applied to the strongly acidic heavy clay red clay of Onna Village in the northern part of the main island of Okinawa at 30kg per are, and after one year it reached 1101C.
A year later, they sowed 5 kg of the land and cultivated sugarcane and spinach. The results are shown in Table 1.

Table 1 Sugarcane Year pH Sugar content (z) Yield (kg) 1 5.8
18.5 980 Treatment area 2 6.0 19.0 13503
5.9 18.0 1240 1 4.5 17.4 670 Untreated area 2 4,3 18.0 7303
4.1 17.1 610 Spinach 1 6.1 180 Treatment area 2 6.3 21036.1
215 1 5.4 130 Untreated area 2 5.3 1103 5
．． 6 94 Example 2 Tomatoes were cultivated using 30 kg of the improver obtained in the same manner as in Example 1 per are in a 5-year-old continuous cultivation greenhouse with alkaline soil in Nishihara-cho, central Okinawa Prefecture. The results are shown in Table 2 in comparison with those without treatment.

Table 2 PHEC yield (kg) Nematode damage (rate) treatment area 8,
1 0.13 1120 Minor (5%) untreated area 8,
2 0.41 450 Severe (65%) These results demonstrate that this improver is effective not only in acidic soils but also in alkaline soils, and is particularly effective in suppressing nematodes.

Claims (1)

[Claims] 1. 4 to 4.75 parts by weight of coal ash, 4 to 4.7 parts by weight of slag
A soil conditioner consisting of 5 parts by weight and 0.5 to 2 parts by weight of zeolite. 2. The soil conditioner according to claim 1, wherein the slag is blast furnace slag. 3. The soil conditioner according to claim 1, wherein the coal ash and slag are equal parts by weight.