Find the method of alkalinizing the soil. What is the method of increasing the alkalinity of soil?

1. Agricultural measures.

The main agricultural technical measures include rational farming, the combination of use and reform, micro-area soil modification, large hole land preparation, and increased application of organic fertilizer.

Deep tillage is conducive to loosening the surface layer, breaking the bottom layer of the plough, improving soil permeability, changing the distribution of salt in the soil profile, and at the same time cutting off the capillary, reducing water evaporation, and inhibiting salt return.

The application of organic fertilizer can promote the formation of aggregate structure, increase soil organic matter, improve the physical properties of soil, and also improve the water storage and water retention capacity of soil and its temperature status, thereby improving the ability of soil to store and regulate nutrients. In addition, the organic acids produced in the process of organic matter decomposition can not only neutralize alkalinity, but also activate calcium in the soil, which can play a role in reducing or eliminating alkali damage.

The main sources of organic fertilizer are: green manure (which can be obtained through a large number of planting, varieties such as field cyanine, grass and trees, etc.); excrement such as manure, urine and other excretions from people, livestock and poultry; as well as domestic garbage, crop straw crushing and returning to the field.

2. Improvement measures for water conservancy projects.

The main purpose of hydraulic engineering improvement is to reduce the groundwater level, and the method is to drain the water mainly through open channels, or to use the method commonly known as "salt washing" to flush the saline-alkali soil with water. This method has been proven to reduce the soil salt content from one time to two uses.

However, water resources in alkalized areas are often scarce, and in view of the increasing scarcity of freshwater resources, this approach is likely to result in waste and outweigh the benefits. Some scholars have proposed the use of inferior water resources (brackish water, brackish water, mineralized alkaline water, etc.) for irrigation, which can improve saline-alkali soil and alleviate the shortage of water resources.

3. Chemical method improvement measures.

The application of chemicals to the alkalized soil can change the composition of colloidal adsorption ions in the soil, thereby improving the physical properties of the soil, increasing the soil structure and permeability. This not only facilitates soil desalination and inhibits salt reflux, but also promotes plant growth.

Commonly used chemical modifiers include superphosphate, gypsum, ferrous sulfate, etc. While chemical modification has these advantages, it also increases the soluble sodium ions in the soil solution. If it is not combined with biological and hydraulic improvement measures, it is difficult to achieve the desired effect.

4. Biological method improvement measures.

Biological measures are generally considered to be the most effective avenues for improvement.

Plants can be used to drain salt. For example, the willow has a strong tolerance for chloride and other salts. The structure of the salt glands and pores of the plant itself can take away a large amount of coarse salt from the soil, increase the coverage rate of plants, reduce ground evaporation, and reduce the accumulation of salt.

The application of organic matter to saline soils is also a typical method of biological improvement. By cultivating the soil, applying organic fertilizer, and cultivating the fertile layer of desalination fertilizer, the physical and chemical properties of the soil can be improved, and the soil desalination can be accelerated, so as to achieve sustainable development.

The application of microbial agents is also one of the biological methods for saline-alkali soil improvement. The application of microorganisms in improving saline-alkali soil is mainly about the research on microorganisms promoting alkali and salt tolerance in plants. Improving the rhizosphere environment of plants through the action of alkali and salt-tolerant microorganisms can reduce the inhibition of salt on plant growth, thereby improving saline-alkali soil.

It should be salted. Sulfuric acid is completely unacceptable and will directly harm the dish. You can apply farm fertilizer, chicken, duck, cow and sheep fertilizer, which is healthy and cheap.

Dilute sulfuric acid is a strong acid, and if you are not careful, the soil will become acidic. It is recommended to use:

Ferrous sulfate in chemical fertilizers, copper sulfate solution, superphosphate. Chicken manure, sheep manure and eggs are good acid fertilizers in farm manure. Ammonium sulfate, potassium chloride, potassium sulfate, ammonium chloride, ammonia sulfate.

These are acidic fertilizers.

Whitening of the soil surface does not necessarily mean soil alkalinization, but may also be salinization.

If it is really alkalized, it is more difficult to control than salinization.

The following chemical improvements are usually used: Substances such as gypsum, phosphogypsum and calcium chloride are applied. The function is to exchange the calcium ions in the alkaline soil colloid, so that it can be discharged from the soil with rain and irrigation water.

Application of sulfur, waste acid, ferrous sulfate and other acidic substances. The function is to neutralize soil acidity, activate calcium in the soil, reduce the concentration of sodium carbonate salts that are more toxic in soil solutions, and improve the effectiveness of certain mineral nutrients to plants. However, various chemical improvement methods must be combined with hydraulic measures (irrigation, drainage) and agricultural measures (deep tillage, soil preservation, application of organic fertilizers, etc.) to be effective.

1. Use lime to neutralize acidity, apply 20 25 kg of lime per mu each time, until it is transformed into neutral or slightly acidic soil.

2. Apply green manure to increase the organic matter in the soil and improve the acidity of the soil.

3. Increase the number of irrigation times to dilute the harm of acidity to crops.

4. Increase the application of alkaline fertilizers, such as ammonium bicarbonate.

Ammonia, lime nitrogen, calcium, magnesium and phosphorus fertilizer, phosphate rock powder, plant ash.

etc., which are good for improving crop yields.

Alkaline soil improvement methods:1. Use acidic fertilizers, such as aluminum sulfate, ferrous sulfate, and sulfur powder.

Ammonium sulfate, ammonium nitrate, superphosphate, potassium dihydrogen phosphate.

Potassium sulfate, etc., directional neutralization of alkaline.

2. Apply more farm fertilizer, improve the soil, cultivate soil fertility, and enhance the affinity of the soil, such as applying well-rotted manure, peat, sawdust, edible fungus soil, etc.

3. Plant plants that are more tolerant to salt and alkali, such as rice; At the same time, reasonable field management is carried out to prevent secondary salinization.

1. Wash salt. Salt washing is to pour water into the saline-alkali land, so that the soil salt is dissolved, and the soluble salt in the topsoil layer is discharged into the deep soil or leached out through infiltration, and the side infiltrates into the drainage ditch to be removed.

2. Level the land. Leveling the land can make the water infiltrate evenly, improve the effect of rainfall salt drenching and irrigation salt washing, and prevent soil patchy salinization. Rake the ground at the right time.

Harrowing can loosen the topsoil, cut off the soil capillary water to transport salt to the surface, and play a role in preventing salt return. Harrowing the land should be timely, shallow spring ploughing, rushing ambush ploughing, early autumn ploughing, ploughing dry but not wet.

3. Increase the application of organic fertilizer and rational application of chemical fertilizer. Potassium sulfate compound fertilizer is a slightly acidic fertilizer, which is suitable for application on saline-alkali land, and has a good effect on improving saline-alkali land.

4. Water conservancy improvement. Establish a sound drainage and irrigation system, separate irrigation and drainage, strengthen water management, strictly control groundwater levels, and continuously leach and remove salt from the soil through irrigation and washing, flood diversion and siltation.

Alkaline land can be alkalized with organic fertilizer.

Commonly used organic fertilizers are rotting human or animal manure. It contains a lot of organic matter, which can promote better growth of the root system and protect seedlings. Organic fertilizer is acidic, and the appropriate amount can reduce alkalinity and reduce the harm of salinity to crops.

When applied, it can be used as base fertilizer, and it can also be used as an appropriate amount of top dressing during the growing season.

There are more alkaline substances in alkaline land, humus in the soil is leached, and the soil structure is destroyed, which will affect the growth of crops, and organic fertilizer can generally be used to remove alkaline substances in the soil; In addition, farmland irrigation, land leveling, deep tillage, etc. can also improve saline-alkali land.

What alkaline land is suitable for planting:

The alkaline soil is suitable for planting figs, wisteria, oleander, pomegranate, pear, jujube, cypress and other plants. Alkaline soil refers to soil with a pH greater than, slightly alkaline pH, and strong alkaline pH. Most plants prefer acidic soils, but these plants are adapted to the soil and can thrive in mildly alkaline soils.

Common Acid Fertilizers:

Acid fertilizers are commonly used ammonium sulfate, ammonium nitrate, potassium dihydrogen phosphate, ammonium bicarbonate, etc. Acid fertilizer can be divided into two types: chemical acid fertilizer and physiological acid fertilizer, which generally undergoes acid reaction after dissolving in water, which is called chemical acid fertilizer; After the soil is applied, the acidic reaction occurs through the absorption of crops, which is called physiological acid fertilizer.

The fastest way to regulate soil alkalinity is to apply more organic fertilizer.

Organic fertilizers play an important role in conditioning the soil. When cultivating fields with alkaline soils, it is appropriate to put more mixtures of well-cooked organic fertilizers and acidic fertilizers (ammonium sulfate, superphosphate, potassium sulfate). Remember:

Do not apply organic fertilizers that are not cooked thoroughly or alkaline (e.g. sheep manure).

First, turn the alkaline ground deep and let it weathered naturally in the natural environment for a period of time before breaking the clods. During the period, it is better to mix ferrous sulfate and sulfur horizontal powder with soil. The reason is that ferrous sulfate is a substance that works quickly but cannot be maintained for a long time when placed in alkaline ground; Sulfur is a slow-conditioning substance.

Hazards of alkaline land

It is the high salt content of the soil and ionic toxicity that make it difficult for plant roots to absorb water and nutrients, causing "physiological drought" and nutrient deficiency. The pH value of the soil in saline-alkali land is generally above the pH value, and even if the soil is rich in nutrients, its absorbability is very low.

The formation of alkaline soils is controlled by a variety of factors, and regional differences are significant. Salinization and alkalinization often occur at the same time. Due to the continuous expansion of human interference, the vegetation on the grassland has also been seriously damaged, and these places are mostly coastal and belong to the wetland category, and the salinity in the seawater will also affect the salinity content of the land, resulting in serious salinization of the land and serious harm.