KR100386854B1 - Ameliorating method of soils with excessive salts or inorganic nitrogen by applying easily decomposable carbohydrates having high C/N ratio as a carbon source of soil microorganisms - Google Patents

Abstract

The present invention relates to a method for rapidly reducing the electrical conductivity and inorganic nitrogen content of soil in which salts are accumulated to improve the excess accumulation of nitrogen and salt accumulation soil. By supplying C / N-degradable carbohydrates to the carbon source of soil microorganisms, the large amount of inorganic nitrogen needed for the rapid growth of microorganisms is desorbed from the soil, resulting in a rapid increase in the soil's electrical conductivity and inorganic nitrogen content. Will be lowered. In the embodiment, when the degradable carbohydrates (glucose, sucrose, and starch) were treated in the salt-condensed soil, the electrical conductivity of the soil was changed from 5dS / m to 1.5dS / m in 60 hours, and the nitrate nitrogen content was 348 mg. It was sharply lowered from / kg to 15mg / kg. In addition, sucrose treatment lowered the soil ammonia nitrogen content of 250 mg / kg to 14 mg / kg in 3 days and restored the ammonia toxicity damage of plants. On the other hand, sucrose treatment allowed plant growth regulation. This method can quickly reduce the salt accumulation of the soil and create a healthy soil environment, and by controlling the soil mineral nitrogen content, it can reduce the ammonia toxicity damage of plants, control the growth of plants, prevent the accumulation of nitrates of plants, It may have an effect on increasing sugar content.

Description

Ameliorating method of soils with excessive salts or inorganic nitrogen by applying easily decomposable carbohydrates having high C / N ratio as a carbon source of soil microorganisms}

The present invention relates to a method of improving the soil in which nitrogen is excessively accumulated and salts are accumulated by reducing the inorganic nitrogen content of the soil and rapidly lowering the electrical conductivity, and more specifically, the decomposition of carbohydrates into the soil. In the process of rapid growth of microorganisms by supplying carbon source of microorganisms, inorganic nutrients in the soil, such as inorganic nitrogen, are rapidly absorbed and assimilated into organic matter in microbial cells, resulting in a drastic reduction in soil nutrients. The present invention relates to a method for improving salt accumulation soil by rapidly lowering the electrical conductivity of soil.

Soil contains many soluble inorganic salts, and plants live their lives by absorbing some of these inorganic salts as essential elements. Since the requirements for plant essential elements are different, the type and amount of each soluble inorganic salt is of course important, but soil science treats the total amount of soluble inorganic salts as a very important factor with regard to plant growth. Electrical conductivity is used as a relative indicator of the total amount of inorganic salts, and soil studies classify soils with more than 4 ds / m as saline soil and define them as unsuitable for crop growth.

In general, an excessively high amount of soluble inorganic salts in the soil is referred to as "salt accumulation", and when salt accumulation occurs in the soil, the osmotic pressure of the soil solution is increased, making it difficult to absorb water from plants even with sufficient water. The concentration difference between the salts is so great that when plants absorb some of the salts as essential nutrients, they cause antagonism and synergism absorption, resulting in imbalance of nutrients in the plant, It causes the growth of the plant will be disturbed.

Salt accumulation in soil occurs through several pathways, which can occur spontaneously such as sea salt concentrations, such as seashore soils, or concentration of salts in soils, as water evaporates continuously, such as in dry land. have. On the other hand, artificially occurs when the fertilizer material is excessively input into the soil, or when domestic sewage, livestock wastewater, factory wastewater and mine wastewater are accidentally introduced or irrigated.

In general, the cause of salt accumulation in farmland is due to excessive application of chemical fertilizers and organic fertilizers. Chemical fertilizers appear as a result of directly adding salts because their chemical composition is mostly inorganic salts, and organic fertilizers are applied to soil microorganisms. In the process of decomposition (inorganization) by generating a large amount of salt, in particular, the most commercialized domestic manure fermentation compost in Korea has a large amount of nutrients in the mineralization process to supply a very large amount of salt to the soil.

The farmland salt accumulation problem is more serious in the soil in the facility house than in the general farmland, because the plant cultivation of plants is intensively grown all year round, so the amount of chemical fertilizer and organic fertilizer is high, and the soil in the facility is plastic film This is because, unlike ordinary agricultural land, accumulated salts have little chance of being washed out of the facility or deep underground by rain or rain because it is blocked from rainfall by rain or glass.

Therefore, salt concentration is a very serious problem in intensive agricultural lands, which remains a challenge.

In order to reduce the salt accumulated in the soil, methods known to date include: ① irrigation of a large amount of water, ② a method of absorbing and removing soil nutrients by planting corn or rye, ③ soil with low salt concentration. ④ There is a method of applying organic materials with high C / N ratio (carbon-nitrogen ratio) like rice straw (Reference: Hwang Sun-woong, Kim Yu-seop, Yeon Byung-ryul, Lee Yong-jae, Park Young-dae. 1993. Desalination Effect of Soil in Plastic Houses by Agricultural Method 35 (1): 276-280.

However, the method of washing with a large amount of water in ① is required to remove a large amount of water, although soil salts are rapidly removed, and groundwater is likely to be contaminated by salts that are separated from the topsoil and moved underground. Moreover, when the soil on the surface is dried, the salt rises again with the water rising from the basement, and the surface soil returns to the original salt concentration. The method of removing salts by planting plants that absorb nutrients such as corn or barley of ② depends on the growth rate of these plants, which takes a long time, and has to bear the economic losses incurred by growing less economical crops. There are disadvantages. The method of landing of ③ aims at the dilution effect by mixing the soil with the small amount of salt from the soil with the accumulated salt, but it has the disadvantage that it takes much effort and expense to carry the huge amount of soil. In the case of the method of reducing salts by applying organic material with high carbon mass, the method of reducing salt accumulation of soil indirectly through the power of soil microorganisms by supplying organic material with high C / N ratio to the soil as carbon source. to be. However, rice straw, which is currently commonly used for this purpose, does not show a great effect because the decomposition rate is too slow.

Carbon is used as a microorganism's body and energy source, and is the most important element to distinguish microorganisms according to the type of carbon source. When organic materials with high C / N ratio are supplied to the carbon source, the nitrogen produced during the decomposition of organic substances is significantly less than about 10, which is the C / N ratio required for the body composition of soil microorganisms. By absorbing nitrogen nitrate and ammonia nitrogen in the soil, inorganic nitrogen dissolved in the soil solution is absorbed and assimilated into the body components of microorganisms, resulting in a decrease in salt accumulation in the soil. At this time, the soil microorganism is not only nitrogen but also other elements required for life support is absorbed from the soil solution, although less than nitrogen when the amount produced in the process of decomposition of the supplied organic material is insufficient in the body composition of the microorganism. For example, the soil microbial C / P ratio (carbon-to-phosphorus ratio) is known to be about 100, so it must absorb that amount of phosphoric acid.

Nitrogen, above all other nutrients, is the most important and necessary for all living things. The main forms of nitrogen absorption of soil microorganisms are two inorganic forms: nitrogen nitrate (NO ₃ ^-- N) and ammonia nitrogen (NH ₄ ⁺ -N). Nitrogen. Among these, nitrogen nitrate is reported to have the highest linear correlation with the electrical conductivity of soil, which is a relative indicator of soil salt accumulation, compared to other salts. (Reference: Jung-Bok Jung, In-Soo Yoo, Bok-Young Kim. 1994. Saturn, Salt Concentration, and Chemical Composition of Soil Horticulture in Central and Northern Areas. Therefore, when soil microorganisms absorb a large amount of nitrogen nitrate in soil with the supply of organic materials having a high C / N ratio, this results in a decrease in salt accumulation of the soil.

On the other hand, the soil C / N ratio of the organic matter that can exhibit the above effects is based on the range of 20-30 in soil science. When the C / N ratio of the organic material supplied is within this range, soil microorganisms in the organic material decomposition process Since the amount of inorganic nitrogen required and the amount of inorganic nitrogen released from organic substances are similar, they have no effect. In addition, supplying organic materials with a C / N ratio lower than 20 releases inorganic nitrogen from organic materials more than the amount required by soil microorganisms, thereby promoting salt accumulation. Therefore, it is possible to reduce salt accumulation by absorbing and supplementing inorganic nitrogen already existing in soil only when supplying organic material with C / N ratio greater than 30. . In this case, the higher the C / N ratio, the greater the inorganic nitrogen requirement of the microorganism, and the greater the salt accumulation reduction effect on the unit dose of the organic substance. On the other hand, how much the carbon component has a chemical composition that can be easily decomposed to microorganisms as much as the C / N ratio of the organic material is a very important factor that determines the speed of the salt reduction effect. In the case of rice straw used in the method of ④, the C / N ratio is about 70, which is considered to be sufficient to reduce the salt accumulation of the soil. However, even though rice straw has a high C / N ratio, salts of soil are the main components of carbon source because of the slow decomposition rate by soil microorganisms such as cellulose, hemicellulose and lignin. There is a drawback that the reduction effect is very slow.

The criteria for determining whether a soil microorganism is an easily degradable (degradable) organic material or an easily degradable (hardly degradable) organic material depends on the number and the number and the number of microorganisms that decompose or use a specific organic substance. . Organic substances such as glucose, sugar, or starch are degradable organic substances that many soil microorganisms use within a few days, whereas cellulose, hemicellulose, and lignin mentioned above are the types of microorganisms that decompose. It can be considered as a hardly degradable organic material with a slow decomposition rate.

In conclusion, the above methods ① to ④, which are known as techniques for reducing the electrical conductivity of the soil, that is, reducing salt concentration, can be considered to be undesirable from an economic and technical point of view.

On the other hand, as with soil microorganisms, one of the most important elements for plants is nitrogen, and like soil microorganisms, absorption forms two inorganic forms, ammonia nitrogen (NH ₄ ⁺ -N) and nitrate nitrogen (NO ₃ ^-- N). In nitrogen form. The amount of inorganic nitrogen that plants absorb from the roots is known to account for 80% of the total amount of nutrients absorbed, which means that the effects of plant growth are enormous (Marschner, H, 1995. Mineral nutrition of higher) plants (2nd ed.). Academic Press Inc.). In the past, the nitrogen deficiency of the plant has been a problem because the nitrogen fertilizer was not supplied smoothly, but the nitrogen nutrient excess of the plant is a problem due to the excessive supply of chemical fertilizer and organic fertilizer with high nitrogen content. When the plant's nitrogen absorption increases, the ground part grows weak and easily susceptible to fall and wind, and thus becomes weak to pests. In addition, the nutrient growth is vigorous and the reproductive growth is low, so the yield of the parts necessary for humans such as grain and fruit is reduced. In addition, the high absorption of nitrogen can reduce the sugar content of fruits and fruits, as the plant's photosynthesis increases the amount of amino acids and proteins that are converted to carbohydrates such as sugar and starch.

Among the inorganic nitrogen, nitrate nitrogen has a great effect on human health and the environment. Nitrate nitrate is absorbed by plants and can store more than necessary in cell vacuoles. Since some of the nitrogen nitrate is an anion and cannot be adsorbed to the soil colloid particles of the same anion, it is easily transported with the subsoil to contaminate the groundwater. Ingestion of large amounts of vegetables or groundwater with high concentrations of nitrate nitrogen produces nitrosoamine, a carcinogen in the body, and is prone to cancer, and it is reported to cause a fatal disease called methemoglobinemia in newborns. In order to reduce the concentration of nitrate nitrogen in harvested plants, it is known to use an appropriate amount of fertilizer and to control the nitrogen supply under strong light conditions (Marschner, H, 1995. Mineral nutrition of higher plants (2nd ed.). Press Inc.) On the other hand, no special alternatives have been reported to reduce the nitrogenous nitrate concentrations in groundwater except for the proper control of nitrogen fertilizers. Therefore, the above methods are passive methods for preventing problems before they occur and have a disadvantage in that active countermeasures cannot be prescribed after problems occur.

In addition, ammonia nitrogen (NH ₄ ⁺ -N) of inorganic nitrogen is absorbed by plants faster than nitrate nitrogen, but when it is above a certain concentration, it causes fatal ammonia toxicity to plant growth, which is less rotten organic matter. Care should be exercised to avoid overdose of these substances, as they are commonly observed in large quantities of urea or urea fertilizers. On the other hand, there is no known method for rapidly recovering plants affected by ammonia toxicity, and only the excess ammonia nitrogen is nitrified by nitrifier and changed into nitrogen nitrate. The ammonia nitrogen concentration in the (near the roots) is waiting to be gradually reduced. As a result, as in the case of nitrogen nitrate, an effective treatment method after the occurrence of a problem is not known yet, except for a passive method of preventing an excessive accumulation of ammonia nitrogen in an appropriate amount of fertilizer.

Eventually, the circulation of materials is constantly occurring in natural ecosystems, and when certain substances enter more than necessary through artificial paths in certain parts of the cycle, the circulation of materials is not smooth, causing environmental pollution and destroying ecosystems. . From this point of view, the excessive accumulation of inorganic nitrogen and salt accumulation in the soil is a kind of soil environmental pollution phenomenon caused by disturbances in the material cycle by artificially adding excessive fertilizer materials due to human desire to increase plant production. It is a well-known fact that changes in the world are a threat to the survival of humanity and are generally easy to cause environmental pollution, but it is economically and technically difficult to restore the polluted environment.

The present invention has been made to solve the above-mentioned problems, an object of the present invention is to supply a decomposable carbohydrate having a high carbon (C / N ratio) as a carbon source of the soil microorganisms and inorganic matter accumulated in the soil A method for improving soils by reducing the conductivity of nitrogen and salt concentration, which is an indicator of overcondensation and salt accumulation. To provide.

In order to achieve the above object, the present invention provides various nutrients required for the growth of microorganisms in addition to carbon by supplying carbohydrates having a high carbonaceous rate (C / N ratio) and disintegrating carbohydrates as carbon sources of soil microorganisms. In other words, in the process of absorbing large amounts of soil salts and rapidly assimilation with organic substances in microbial cells, the amount of soil nutrients, especially inorganic nitrogen (NH ₄ ⁺ -N and NO ₃ ^-- N), can be drastically reduced. Achievable by quickly lowering the electrical conductivity, particularly water-soluble carbohydrates can be used by dissolving in water because they are often used in water.

If the above-mentioned "degradable carbohydrate with high C / N rate" is defined, "high C / N rate" means that the C / N rate of the carbohydrate is effective only at 30 or more, and at higher C / N rate, The higher the C / N ratio, the greater the treatment effect per unit weight of carbohydrates, so the higher the C / N ratio, the better the material. On the other hand, "degradable" means a carbon source of soil microorganisms, and has a chemical composition that can be used quickly within a few days, so that it can meet the rapidity of effect expression, which is the object of the present invention. Therefore, "degradable carbohydrate with high C / N ratio" means that the material should satisfy both the high carbon yield and this degradability at the same time.

Hereinafter, with reference to specific embodiments of the present invention will be described in detail.

A) Soil Electrical Conductivity and Rapid Nitrogen Nitrate Reduction Effect by Degradable Carbohydrate Treatment

In the laboratory experiments, we investigated the effect of rapid decrease of soil electrical conductivity and nitrogen nitrate content after feeding degradable carbohydrate with very high C / N ratio to the soil.

Example 1

In this experiment, soils with salt concentrations with electrical conductivity of 5dS / m and NO ₃ ^-- N content of 348mg / kg were collected from farmhouse pavement. After drying the soil, sift 2 mm sieves and add 3 to 10.8 g of carbon dioxide per 1 kg of soil (glucose, sucrose and starch). Assuming that 1.25g / cm3 is equivalent to the soil weight of 125,000kg, it is treated within the range of 0 ~ 1,350kg) and then adjusted to 90% of the amount of water for packaging. The soil was collected over time while incubated at 25 ° C. in an incubator, and the electrical conductivity was analyzed by an electric conductivity meter (EC meter). Moisture content was measured at weekly intervals to replenish the water consumed by evaporation with distilled water.

As shown in Table 1, the soil electrical conductivity was maintained at a high level of 3.5 to 5.7 ds / m during the untreated treatment period, while in carbohydrate treatment, it was 1.5 to 2.0 ds / m after 60 hours regardless of the carbohydrate type. The temperature was drastically lowered, and the lower value was maintained for 5 weeks. Depending on the carbohydrate throughput, the rate of decrease tended to be slightly lower at 1.8g / kg, which was the lowest amount of carbon used.

Table 1

Rapid Reduction of Soil Electrical Conductivity by Disintegrating Carbohydrate Treatment

process Elapsed time Carbohydrate species Throughput (carbon g / kg) 12 hours 18 hours 24 hours 36 hours 60 hours 72 hours 96 hours 1 week 2 weeks 3 weeks 4 Weeks 5 Weeks No treatment 4.7 3.5 4.0 4.1 4.0 4.1 5.3 5.7 5.5 4.5 5.2 4.7 Sucrose 1.8 4.3 3.6 3.5 3.2 2.9 2.9 3.0 3.3 2.8 2.1 3.2 2.5 3.6 4.3 3.5 3.6 2.3 1.9 1.9 1.8 2.3 2.4 2.1 2.3 2.2 5.4 4.3 3.5 3.7 2.9 1.9 2.0 1.9 2.3 1.6 1.9 2.7 2.8 7.2 4.4 3.8 3.6 2.3 1.9 1.9 1.7 2.2 2.2 2.0 2.1 2.8 10.8 4.5 3.3 3.4 2.3 1.8 2.6 2.8 2.2 2.0 2.2 2.6 2.2 Glucose 3.6 4.4 3.5 3.4 2.2 1.7 1.8 2.2 2.4 2.6 2.4 2.6 2.2 Starch 3.6 4.7 3.5 3.4 2.6 2.0 2.0 2.3 2.2 2.5 2.5 2.6 2.4 7.2 4.8 3.7 3.6 2.6 1.5 1.8 2.5 2.3 3.0 2.2 2.2 2.1

In Table 2, the nitrate nitrogen content of the soil was maintained at a high level of 347 to 449 mg / kg for the untreated treatment, while the carbohydrate treatment rapidly decreased over time to between 15 and 26 mg / kg after 60 hours of treatment. The lowest value was shown. As the amount of carbohydrates increased, the rate of decrease of NO ₃ ^-- N content increased, and starch treatment tended to decrease slightly compared to sugar and glucose treatment.

Taken together, the results of the above examples show that supplying the decomposable carbohydrates to the salt-integrated soil is a very effective way to make healthy soil by rapidly lowering the soil electric conductivity and the nitrogen nitrate content.

TABLE 2

Rapid Reduction Effect of Soil-Nitrate Nitrate by Disintegrating Carbohydrate Treatment

process Elapsed time Carbohydrate species Throughput (carbon g / kg) 12 hours 18 hours 24 hours 36 hours 60 hours 72 hours 96 hours 1 week 2 weeks 3 weeks 4 Weeks 5 Weeks No treatment 385 347 378 372 385 391 440 444 439 449 400 375 Sucrose 1.8 313 281 265 232 203 180 160 147 89 66 73 70 3.6 303 253 205 36 16 21 17 37 40 37 50 53 5.4 281 257 218 30 15 17 19 15 10 17 53 71 7.2 244 238 166 16 16 18 21 17 0 20 43 64 10.8 234 235 180 14 16 20 20 12 13 62 81 102 Glucose 3.6 244 205 183 67 26 27 21 54 52 67 78 98 Starch 3.6 320 273 212 55 21 21 16 19 35 56 74 92 7.2 321 278 228 71 19 23 16 21 2 14 39 56

B) Rapid reduction of ammonia-like nitrogen in soils by treatment with degradable carbohydrates

The effect of rapid reduction of ammonia nitrogen in the soil after feeding this degradable carbohydrate with high C / N ratio to the soil was examined in a laboratory experiment.

Example 2

In this experiment, it was collected by air-dried soil with very low ammonia nitrogen content and passed through 2mm sieve. In order to control the soil ammonia nitrogen content to 250mg / kg, ammonium sulfate per 1kg soil was treated to 1180mg level. In addition, this degradable carbohydrate sucrose was treated with an aqueous solution at various levels within the range of 0 to 8 g in terms of carbon content per kg of soil, and the carbon treatment amount was assumed to be 10 a soil area, 10 cm depth and 1.25 g / cm ³ volume density. Soil weight calculated by the equivalent of 125,000kg, corresponded to 0 ~ 1,000kg. After adding the water corresponding to 90% of the amount of water to the treated soil in the beaker, the soil was collected over time for 4 days at 25 ℃ in a thermostat, and the soil was collected over time to analyze the ammonia nitrogen content by Kjeldahl distillation.

In Table 3, the ammonia nitrogen content of the soil did not show a significant change when the sucrose was not treated, whereas the sucrose treatment decreased significantly as the throughput increased. At 4 g / kg and 8 g / kg levels, the ammonia nitrogen content decreased to a low concentration of 12 mg / kg after 96 hours (4 days) of treatment. On the other hand, the reduction rate of ammonia nitrogen content was gradually decreased until the initial 12 hours, and then rapidly decreased after 18 hours of sucrose treatment, and rapidly decreased to reach equilibrium after 72 hours (3 days) of treatment.

TABLE 3

Effect of Sucrose Treatment on Soil Ammonia Nitrogen over Time

Sucrose throughput (carbon g / kg) Elapsed time after treatment (hours) 2 4 8 12 18 24 36 48 72 96 0 237 268 236 229 217 224 222 227 214 205 0.5 234 248 217 221 191 182 172 179 170 168 1.0 240 234 223 209 175 160 138 136 134 129 1.5 251 275 222 210 180 164 131 116 108 103 4.0 245 249 218 203 167 154 120 97 18 12 8.0 244 248 226 210 173 148 88 76 14 12

Therefore, the above results indicate that nitrogen chemical fertilizers and organically fertilized organic fertilizers are excessively supplied to the soil, so that when the plants growing there are ammonia toxic damage and grow abnormally, they can supply this degradable carbohydrate with high C / N rate. This suggests that plants can be recovered from ammonia toxicity by rapidly reducing ammonia nitrogen in soils.

C) recovery effect of ammonia toxicity damage of plants by treatment of degradable carbohydrate

In the pot experiment, the effect of recovering ammonia toxicity damage of plants when feeding this degradable carbohydrate with a high C / N ratio was examined.

Example 3

In this experiment, nutrient soils with relatively low nutrient content were used. After treatment with nitrogen at 29 kg N / 10a to induce ammonia toxicity damage, 5 levels (0, 58, 115, 173, 288 kg / 10a) were used for the carbon treatment in order to see the effect on the ammonia toxicity of the degradable carbohydrates. ). The experiment was carried out in three repetitions. After filling the dry soil with 1a / 5000 pots necessary for the experiment, the amount corresponding to the above nitrogen level was treated with urea, in which phosphoric acid and kali And boron were given to the RDA standard fertilizer for Chinese cabbage with solubilized fertilizer, ferric chloride and boric acid, respectively. Immediately after fertilizer treatment, cabbage seedlings purchased at the process nursery were settled. After 5 days, the ammonia toxicity of cabbage began to appear. At this time, the carbon source was sucrose, treated with an aqueous solution according to the carbon throughput, and the growth of cabbage was observed. After 27 days, the fresh weight of cabbage was measured. Investigate. The results of the experiment showed that after 5 days of eating, the typical ammonia toxicity of cabbage (with leaves withered and burned, darker and more leaf-colored and spatula with the leaf edge upward) showed sucrose in soil. By feeding to the carbon source of the microorganisms, it was clearly observed that the cabbage recovers from the ammonia poisoning. As a result, as the sucrose supply amount increased, the ammonia poisoning was reduced and the cabbage fresh weight was increased.

Table 4

Effect of Sucrose Treatment to Reduce Ammonia Toxicity of Chinese Cabbage

sucrose supply (carbon kg / 10a) Chinese cabbage weight (g / week) after 27 days 0 0.6 58 2.6 115 4.3 173 8.9 288 8.1

The results of the above experiments show that ammonia in soil in the process of using carbohydrates as a carbon source when soil microorganisms use carbohydrates as carbon sources when sucrose and high-degradable carbohydrates such as sucrose are supplied to soils that have high ammonia nitrogen concentrations and thus cause ammonia toxicity to plants. It can be concluded that by absorbing natural nitrogen, it can rapidly reduce ammonia nitrogen and thereby restore the ammonia toxicity damage of plants.

D) Growth control effect of plants by degradable carbohydrate treatment

Dipotable carbohydrates with high carbon yield were examined in the pot test for the effect of plant growth control.

Example 4

In this experiment, the soil was used, and fermented compost was mixed well with soil at 2 to 10a level and placed in 1a / 2000 pot, and cabbage seedlings purchased at the process nursery were formulated. Immediately after the cabbage was planted, three levels of sucrose (0, 37, 74kg / 10a) were dissolved in water, and the experiment was repeated three times. The Chinese cabbage was harvested after 48 days, which was the beginning of the cabbage, and the dryness was added. After 19 days, the soil was collected and the inorganic nitrogen was analyzed by the Kjeldahl distillation method.

In Table 5, as the amount of sucrose increased, the inorganic nitrogen content of the soil decreased compared with the case without sucrose treatment. Accordingly, the fresh weight of Chinese cabbage harvested after 48 days was also decreased with increasing sucrose throughput.

Table 5

Reduction of Soil Mineral Nitrogen Content and Cabbage Growth by Sucrose Treatment

Sucrose Throughput (Carbon kg / 10a) Inorganic nitrogen content (mg / kg) after 19 days Chinese cabbage weight after 48 days (g / week) 0 59 538 37 48 382 74 34 354

In this experiment, by supplying sucrose, which is a high C / N ratio and a degradable carbohydrate, microorganisms showed a lack of nitrogen source in the process of growth, and the insufficient nitrogen was used as inorganic nitrogen produced during the fermentation of pig fermentation compost. In addition, the content of inorganic nitrogen in the soil is lowered, and thus the amount of inorganic nitrogen for the growth of cabbage is reduced and the yield of cabbage is lowered.

Nitrogen is the most important element in the growth of microorganisms and plants, and the two organisms compete with inorganic nitrogen because they form inorganic nitrogen (NH ₄ ⁺ -N and NO ₃ ^-- N) in the same nitrogen absorption form. . Therefore, it is concluded that the growth of plants can be controlled by inducing competition for inorganic nitrogen between two organisms by controlling the supply of high carbon degradable carbohydrates as in this experiment.

Although the present invention has been described in detail by way of examples, the present invention is not limited thereto, and modifications, improvements, and applications thereof may be made without departing from the ordinary knowledge of those skilled in the art.

As described above, the present invention provides an excellent solution to the accumulation of excess inorganic nitrogen and the accumulation of soil salts in the soil which can be regarded as one of the soil environmental pollution.

In other words, by supplying the degradable carbohydrates commonly found in the surroundings to induce the proliferation of countless microorganisms in the soil, indirectly accumulate the inorganic nitrogen of the soil and salt accumulation phenomena in nature and quickly reduce it. It provides a very effective soil remediation method that does not have the advantages of the prior art, that is, there is no secondary pollution, it is economical, labor less, very quick and easy to implement. Done. In addition, the present invention that can control the soil inorganic nitrogen content is due to the enormous effect of the nitrogen component on the organism, will exhibit a variety of effects. That is, recovery from ammonia poisoning damage of plants, control of growth of plants, reduction of nitrate nitrogen accumulation in leafy vegetables, and increase in sugar content of fruits and fruits.

Claims (2)

1 to 1,350 kg of carbon component per 10 a (1000㎥) of soil area is supplied as a carbon source for soil microorganisms by dissolving carbohydrates having a carbon quality (C / N ratio) of 30 or more as a single use of solid or aqueous solution. How to quickly reduce the soil's electrical conductivity and inorganic nitrogen (NH ₄ ⁺ -N and NO ₃ ^-- N) content to improve the accumulation of excess nitrogen and salt accumulation soil [Claim 2] The excess accumulation and salt accumulation of nitrogen according to claim 1, wherein the degradable carbohydrate having a carbon ratio (C / N ratio) of 30 or more is selected from the group consisting of monosaccharides, disaccharides, oligosaccharides, and polysaccharides. How to improve the soil