Which fertilizers are acidic and what are the acidic fertilizers?

Acid fertilizers are divided into two types: chemical acid fertilizers and physiological acid fertilizers, acid fertilizers are superphosphate, heavy superphosphate, potassium chloride, ammonium chloride, potassium dihydrogen phosphate, ferrous sulfate, ammonium chloride, potassium sulfate, ammonium sulfate, ammonium sulfate, ammonium sulfate, monoammonium phosphate, ammonium nitrate, etc.

1. Variety classification.

What are the acidic fertilizers.

Acid fertilizers are mainly divided into two categories, one of which is dissolved in clear water to make the solution acidic, called chemical acid fertilizer, and the other is applied to the soil, which will be absorbed by crops before it will be acidic, called physiological acid fertilizer.

2. Superphosphate.

Superphosphate is a common chemical acid fertilizer, its main components are calcium dihydrogen phosphate, phosphoric acid and anhydrous calcium sulfate, the color is gray or gray-white, it can be directly used as phosphate fertilizer, or use superphosphate and other fertilizers to make compound fertilizer.

3. Ammonium sulfate.

Ammonium sulfate is a common physiological acid fertilizer, which can be used in agriculture, textiles, leather, medicine and other fields, and the ammonium sulfate used as fertilizer is also called nitrogen fertilizer, which is rich in nitrogen, which can improve the growth rate of crops, and improve the quality of fruits, so that crops can yield abundantly.

4. Potassium chloride.

Physiological acidic fertilizers also include potassium chloride. Potassium chloride is an inorganic compound that appears as white granules that resemble edible salt particles in appearance. Potassium chloride is rich in potassium, which can increase the fruit yield of crops by acting on crops.

In alkaline soils, acidic fertilizers can be used appropriately to improve the acidity and alkalinity of the soil.

Note that acidic fertilizer and alkaline fertilizer cannot be mixed, and if they are mixed, the fertilizer efficiency will be greatly reduced.

Acid fertilizers are commonly found in ammonium sulfate, ammonium nitrate, potassium dihydrogen phosphate, ammonium carbonate, etc. Acid fertilizer can be divided into two types: chemical acid fertilizer and physiological acid fertilizer, which generally show an acidic reaction after dissolving in water, which is called chemical acid fertilizer; When it is applied to the soil and absorbed by the crop, it shows an acidic reaction, which is called physiological acid fertilizer.

1. Which fertilizers are acidic

Acid fertilizer refers to the fertilizer that exhibits an acidic reaction, which is divided into two types: chemical acid fertilizer and physiological acid fertilizer.

1. Chemical acidic fertilizers: all fertilizers that are dissolved in water and show acidic reactions, such as: superphosphate, heavy superphosphate, etc.

2. Physiological acid fertilizer: some chemical fertilizers are dissociated into cations and anions after being applied to the soil, because the crops absorb more cations than anions, so that there are more acid ions remaining in the soil, so that the acidity of the soil (or soil solution) is increased, and the soil acidity is increased by the fertilizer that absorbs nutrients by crops, such as: ammonium chloride, potassium sulfate, potassium chloride, ammonium chloride, ammonium sulfate, ammonium sulfate, ammonium sulfate, etc.

2. How to choose and apply fertilizers according to crops

1. Fertilizer should be selected according to the pH of the soil and the sensitivity of crops to pH, and the principle of applying acidic fertilizer in alkaline soil and alkaline fertilizer in acidic soil can generally be followed. For example, alfalfa, sunflower, sugar beet, etc. are more alkali-tolerant, so alkaline fertilizers can be applied; Oats, buckwheat, potatoes, sweet potatoes, etc., are more acid-tolerant and can be applied with acidic fertilizers.

2. Physiological alkaline fertilizers, such as sodium nitrate, potassium nitrate, and nitro compound fertilizers, should be used in acidic soils, and organic fertilizers and lime should be used to reduce the impact of soil acidification.

3. Physiological acidic fertilizers should be used for alkaline soils, such as ammonium sulfate, ammonium chloride, etc., but ammonium chloride and sodium nitrate should not be applied to saline-alkali land to avoid the harm caused by excessive sodium ions and chloride ions.

4. Acidic fertilizer and alkaline fertilizer cannot be mixed, once mixed, it will greatly reduce the fertilizer efficiency. For example, urea cannot be mixed with alkaline fertilizers such as lime, plant ash, calcium, magnesium and phosphorus fertilizers; Potassium dihydrogen superphosphate cannot be mixed with plant ash, magnesium and phosphorus fertilizer and ash potassium fertilizer; Ammonium sulfate cannot be mixed with ammonium carbonate, ammonia, plant ash and ash potassium fertilizer, etc.

Fertilizers with a pH value lower than 7 are acidic or weakly acidic, such as Henan's garlic residue organic fertilizer, and there is no problem with sterilization.

Acid fertilizers are: superphosphate,Ammonium sulfate, monoammonium phosphate, ammonium nitrate, calcium nitrate, ammonium sulfate,Potassium chloride, potassium sulfate,Ammonium chloride, ammonia sulfate. Ferrous sulfate, copper sulfate solution, superphosphate, chicken manure, sheep manure and eggs in farm fertilizer are all good acid fertilizers.

There are two types: chemical acid fertilizer and physiological acid fertilizer. Any dissolved in water that presents an acidic reaction is called a chemical acidic fertilizer. Any application to the soil after being absorbed by crops, showing an acidic reaction, is called physiological acid fertilizer.

Notes on Acid Fertilizers:

1. Acidic fertilizers should not be mixed with alkaline fertilizers, ammonium carbonate.

Ammonium sulfate, ammonium nitrate, ammonium phosphate cannot be mixed with plant ash.

Mixed application of alkaline fertilizers such as lime and kiln ash potassium fertilizer will cause a neutralization reaction, resulting in nitrogen loss and reduced fertilizer efficiency.

2. Chlorine-containing fertilizers should not be used in saline-alkali land.

In terms of chlorine-resistant crops, some crops are more sensitive to chlorine, which will inhibit growth when exceeding a certain amount, while some crops are less sensitive to chlorine and need to adversely affect growth at higher levels. Even chlorine-sensitive crops need to absorb chlorine, albeit in relatively small amounts.

3. Nitrogen fertilizer should not be applied shallowly or before watering, and nitrogen fertilizer should generally be converted into ammonium nitrogen after being applied to the soil, which is easy to volatilize with water loss or light and heat, and lose fertilizer effect.

4. Ammonium carbonate and urea.

It cannot be mixed, and the amide nitrogen in urea cannot be absorbed by crops, and can only be used by crops after being converted into ammonium nitrogen under the action of adenoenzymes in the soil; After iron carbon is applied to the soil, the soil solution will react acidically in a short period of time, which will accelerate the volatilization loss of nitrogen in urea, so it cannot be mixed application.

5. Nitrogen fertilizer should not be applied to leguminous crops, leguminous crops have nitrogen-fixing rhizobia in their roots, and excessive application of nitrogen fertilizer will not only cause waste, but also make crops greedy for green and late maturity, affecting yield.

The first point, and a common method of improvement, is the proper application of lime.

On acidic soils, lime is applied annually at 10 to 40 kg per mu until the soil becomes slightly acidic or neutral.

The second point is to plant acid-tolerant crops.

Growers can improve crop varieties, such as planting acid-tolerant crops such as mung bean, rapeseed, buckwheat and rice. Soil acidity is regulated through land preparation management and soil activation.

The third point is to increase the application of farm fertilizer and cultivate soil fertility.

Before crop planting, agricultural fertilizers are mainly applied to soil organic matter to improve soil permeability, improve rhizosphere microbial activity, and convert insoluble mineral elements in the soil into soluble nutrients, so as to achieve the purpose of fertilizing soil fertility.

Fourth, apply an acidic soil amendment.

This agent has a long period of effect, but it is effective to use. Soil structure improvement is to promote the formation of soil aggregates, improve soil structure, improve fertility, fix topsoil, protect soil tillage layer, and prevent soil erosion by applying natural soil amendments (such as humic acid, cellulose, biogas residue, etc.) and artificial soil amendments (such as polyvinyl alcohol, etc.).

Fifth, the implementation of water-drought rotation to improve physical and chemical properties.

Drought and flood rotation in acidic soil (2 years and 3 years) can improve soil tillage and physical and chemical properties, mulching after sowing, adjusting rice-rice, rape-rice and other planting methods, selecting alkali fertilizers (such as ammonium carbonate, ammonia) to achieve the purpose of improvement, and improving cultivation technology to prevent soil erosion.

Alkaline substances should be used to neutralize acidic soils.

There are three substances commonly used to neutralize soil acidity in life:

Hydrated lime, hydrated lime is a kind of alkali, which can neutralize acidic soil, has no harm to plants, is economical and easy to obtain, and has an ideal effect.

Grass ash, aqueous solution alkaline, can be said to be the lowest cost, very practical fertilization, with ammonium bicarbonate, aqueous solution into slightly alkaline, is a very good chemical fertilizer, plants are easy to absorb.

Answer: Acidic soils are suitable for growing peanuts, potatoes, turnips, sweet potatoes, watermelons, berry plants (such as strawberries, etc.), hemp, rhododendrons, lilies, heather, marigolds, honeysuckle, cedars, oaks, etc.

Ask what saline soil is suitable for planting.

How to improve saline-alkali soil.

Answer: Salix is one of the fast-growing tree species in sandy and alkaline land. It is resistant to water and moisture, suitable for propagation by cuttings, and suitable for growing on mildly sulfate soil. It can be planted on both sides of the river channel and saline-alkali depression in the waterlogged and alkaline area, and should be used as a pioneer tree species, a sand dune front retaining forest belt and a charcoal forest, and it is also a good tree species for farmland shelterbelts.

Weeping willow, also known as water willow, likes wetlands and watersides, is moderately tolerant to salinity, and can be used as an important shelterbelt tree species in saline-alkali land. Propagation by cuttings or burying dry.

Akuna Tsubaki grows quickly and reproduces easily. It should be selected as a pioneer tree species for afforestation in the early stage of saline-alkali land, and can be revetted and windproofed, and can be planted on both sides of the channel and on both sides of the road on higher ground.

Neem Neem is second only to Robinia pseudoacacia in salt tolerance, and can grow on dry and thin saline-alkali land, with few insect pests, fast growth and strong germination.

The first is to change the soil, and it is recommended to use sand mixing to change soil, and add 300 400 cubic meters per mu of land.

The second is to apply farmhouse fertilizer, more than 2,000 kilograms per mu, and apply it year after year to improve the soil and fertilize the soil. Try not to use chemical fertilizers, when it is necessary to use chemical fertilizers, acidic fertilizers, such as ammonium sulfate, potassium sulfate, superphosphate, etc. to neutralize alkalinity, and potassium chloride should not be applied, because it will aggravate alkalinity.

The third is to plant alkali-tolerant crops, such as hemp, sunflower, sorghum, pasture, etc.