JPH0363595B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an inorganic soil conditioner. [Conventional technology] 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. Various soil conditioners have been known for a long time, but
All of these improve one or two of the above characteristics, and nothing that comprehensively improves the above characteristics is known. For example, methods of improving soil using slag and coal ash are known, but slag and coal ash are strongly alkaline and are useful for improving acidic soil, but if administered in excess, they can cause alkaline damage. There are many. Also, if you try to avoid this by reducing the amount of slag or coal ash added, the soil will return to acidic soil in a short period of time.
The disadvantage is that the effect does not last long. Another disadvantage of slag is that it hardens the soil due to hydraulic reactions. Furthermore, slag and coal ash have a weak ability to capture fertilizers, and the 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 foamed particles then floated out of the soil and flowed onto the soil surface, resulting in no soil improvement effect, and the fertilizer was often washed away along with the soil. 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 provides a soil conditioner that does not have the above-mentioned drawbacks of conventional soil conditioners and can improve all of the chemical, physical, and biological properties of soil. The purpose is to [Means for Solving the Problems] That is, 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 parts by weight of zeolite.
It is a soil conditioner consisting of 2 to 2 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, a soil conditioner containing 5 to 20% of zeolite, which is said to be ineffective in improving soil depending on the conditions, such as in the case of poor acidic soil, is not sufficiently added. However, alkalinity can be maintained for a long period of time without causing alkaline damage. The ratio of coal ash to slag is preferably 1:0.5 to 2, more preferably approximately 1:1. Coal ash in the form of ordinary fine powder can be used. Slag includes blast furnace slag, converter slag,
Any electric furnace slag can be used, but
Blast furnace slag is preferred because of its composition. The slag is preferably in the form of fine particles, and granulated slag with a particle 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, because both coal ash and slag are exposed to high temperatures, there are usually no harmful bacteria present, 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, air permeability and water permeability are moderately improved, and the ability to capture fertilizers is also high. or,
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. [Examples] The present invention will be explained in more detail below using Examples. Example 1 A soil conditioner was obtained by uniformly mixing 45 kg of granulated blast furnace slag (particle size: 0.1 to 2 mm), 45 kg of coal ash, and 10 kg of zeolite (particle size: 0.1 mm or less) using a mixer. 30kg of this was sown per area in the strongly acidic heavy clay red soil of Onna Village in northern Okinawa's main island, then 10kg per area one year later, and 5kg after that one year, and cultivated sugarcane and spinach. The results are shown in Table 1.

[Table] 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] From these results, it can be seen that this improver is effective not only in acidic soil but also in alkaline soil, and is particularly effective in suppressing nematodes.

Claims (1)

[Claims] 1. 4 to 4.75 parts by weight of coal ash, 4 to 4.75 parts by weight of slag.
A soil conditioner consisting of 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 improvement agent according to claim 1, wherein the coal ash and slag are equal parts by weight.