Does soil pH have an effect on plant color?

Effect of soil pH on the cultivation of foliage plants: Soil pH is closely related to soil physical and chemical properties, microbial activities and decomposition and utilization of mineral elements, which directly affects the physiological activities of plant roots and the absorption of mineral nutrients. The availability of the nutrient phosphorus is highest in soil at pH.

In the soil with a pH value greater than or less than the combination of calcium, iron, aluminum, its activity will be greatly reduced. According to the pH value of soil acid-base reaction, the soil is divided into three basic types: acidic soil (pH value less than 6 5) and neutral soil (alkaline soil (pH value greater than 3). The types of soil acid-alkali reactions are different in all regions of the country, and it is necessary to select the type of soil acid-alkali reaction suitable for the growth of flowers according to local conditions, or carry out soil improvement according to the growth requirements of leafy plants.

Detection of the pH of the upper soil: take a small amount of soil to be tested, add distilled water, just soak the soil, stir slightly, after clarification, take the pH test paper and dip it in the soil solution, and then compare it with the standard chromatography on the colorimetric plate to find out the value of the color palette near the color, that is, the pH value of the measured soil.

Different species of flowers have different requirements for the pH of the soil in which they grow. Most open-field foliage plants require a pH level close to neutral (pH of about 7), while greenhouse foliage plants prefer slightly acidic soils. There are also a few foliage plants that can grow in both alkaline and acidic soils.

Flowers and plants fix the soil with an unsuitable pH level, which will lead to poor growth and even death.

Lose. For soils whose pH does not meet the requirements, an appropriate amount of acid-base substances can be added for neutralization and adjustment. In case of soil with strong alkalinity, apply ferrous sulfate, aluminum sulfate, sulfur and acid fertilizer to neutralize the alkalinity of the soil.

When encountering excessively acidic soil, dolomite, calcium carbonate, limestone and alkaline fertilizers can be used for neutralization and adjustment.

Is it difficult to raise flowers with soil? Preparing different soils according to different flowers can be more targeted.

The color of the vacuole cell fluid in the petals can be used as an indicator to reflect the pH of the soil.

Some have implications.

For example, saffron is orange in dilute acid, pink in alcohol, and green in dilute alkali.

Marigolds, on the other hand, do not change color.

Introduction Hydrangea, also known as hydrangea and hydrangeas, is a shrub plant of the genus Hydrangea in the family Hydrangea. The hydrangea sedan chair has a very eye-catching feature, that is, it can change with the pH of the soil, and the color can be different. When the pH of the soil is acidic, the flowers produced by hydrangeas are blue, and when the pH of the soil is alkaline, the flowers that bloom are red.

Of course, within the tolerance range, the more acidic the soil, the more dark blue it is, and the more alkaline the bridge sail cover, the redder it is. If you want the hydrangea to bloom blue, you can apply aluminum sulfate, and if you want to be red, you can apply lime in the soil. Because of the unique personality of hydrangeas and the lovely clusters of flowers, hydrangeas have become a common garden flower in Europe.

Planting method Hydrangea is a short-day plant that likes warmth, and the growth temperature is most suitable at about 23 degrees, and it cannot be exposed to strong direct sunlight, which will cause the leaves to shrink rapidly. Although hydrangeas like moisture, they are afraid of waterlogging, which can cause both leaves and roots to rot.

The reason why soil is acidic and alkaline is because of the presence of a small amount of hydrogen ions and hydroxide ions in the soil. When the concentration of hydrogen ions is greater than the concentration of hydroxide ions, the soil is acidic, and vice versa, it is alkaline, and when the two are equal, it is neutral.

In the normal range, the reason why plants are sensitive to soil acidity and alkalinity is that the soil pH value affects the concentration of various ions in the soil solution, and affects the effectiveness of various elements to plants.

Effect of soil acidity and alkalinity on plant growth:

1 The growth of each plant has its own suitable soil acidity and alkalinity, most plants are difficult to grow normally under pH conditions, rhododendron, bilberry, camellia, fir, pine and other plants like acidic soil, and tamarix, jujube, wolfberry, etc. like saline-alkali soil, field crops are more suitable for neutral soil.

2. Underground pests often require a certain range of pH environmental conditions, such as bamboo locusts like acid, while scarabs like alkali.

3. Some diseases can only occur within a certain pH range, such as cataplexy is often prone to occur on alkaline and neutral soils.

4. The alternating aluminum adsorbed on the soil colloid and the aluminum ions in the soil solution are an important ecological factor that has a significant impact on the distribution, growth and succession of natural vegetation. In strongly acidic soils, there is a lot of aluminum, and plants living on such soils tend to tolerate aluminium or even like aluminium (such as broom orchid, tea tree, etc.); But for some plants, such as clover and alfalfa, aluminium is toxic and inhibited when the soil is rich in aluminium. Studies have shown that aluminum poisoning is an important cause of the decline of land fertility in plantations.

5. Within the normal range, the reason why plants are sensitive to soil acidity and alkalinity is that the pH value of the soil affects the concentration of various ions in the soil solution, thus affecting the effectiveness of various elements on plants.

6. Effect of soil acidity and alkalinity on the availability of nutrients. The higher effectiveness of nitrogen at pH is due to the decrease in the activity of nitrogen-fixing bacteria when the pH value is less than 8, and the nitrification is inhibited when the pH value is greater than 8. The effectiveness of phosphorus is higher at pH, and when the pH value is less than , iron phosphate and aluminum phosphate are easy to form, so the effectiveness is reduced. At pH values higher than the easy formation of calcium dihydrogen phosphate; Acidic soils have a strong leaching effect, and potassium, calcium, and magnesium are easily lost, resulting in a deficiency of these elements.

When the pH value is higher than , the soil sodium ions increase, and the calcium and magnesium ions are replaced to form carbonate precipitation, so the availability of calcium and magnesium is higher in the pH in acidic soil because it is soluble. Molybdate is insoluble in acid but soluble in alkali, and is easily deficient in acidic soil; Borate is more effective at pH.

Soil texture is very closely related to the growth of plants, and the acidity or alkalinity of the soil is too large, which will affect the root growth of plants to a certain extent, thereby affecting the normal growth and development of plants. Therefore, it is of great significance to study the relationship between soil acidity and alkalinity and plants, to speed up soil improvement, and to cultivate soil fertility.

1. Most plants are difficult to grow in the case of pH > or ". Plants can grow normally in a wide range, but each plant has its own suitable pH.

Acid-loving plants: Rhododendron, Bilberry, Camellia, Fir, Pine, Rubber Tree, Stone Orchid;

Calcium-loving plants: alfalfa, rhinoceros, southern Tianzhu, cypress, linden, elm, etc.;

Likes saline-alkali plants: tamarix, jujube, wolfberry, etc.

2. Plant diseases and pests are directly related to soil acidity and alkalinity

1) Underground pests often require a certain range of pH environmental conditions, such as bamboo locusts like acid and scarab like alkali;

2) Some diseases only occur within a certain pH range, such as mellow, which tends to occur on alkaline and neutral soils.

3. Soil active aluminum: exchangeable aluminum adsorbed on soil colloids and aluminum ions in soil solution, which is an important ecological factor and has a significant impact on the distribution, growth and succession of natural vegetation;

In strongly acidic soils, there is a lot of aluminum, and plants living on such soils tend to tolerate aluminum or even like aluminum (broom orchid, tea tree); But for some plants, such as clover and alfalfa, aluminum is toxic, and growth is inhibited when the soil is rich in aluminum; Studies have shown that aluminum poisoning is an important cause of the decline of land fertility in plantations.

2. Effect of soil acidity and alkalinity on nutrient availability.

1. Within the normal range, the reason why plants are sensitive to soil acidity and alkalinity is that the soil pH value affects the concentration of various ions in the soil solution and affects the effectiveness of various elements to plants;

2. Effect of soil acidity and alkalinity on the availability of nutrients:

1) The higher effectiveness of nitrogen at 6 8 is due to the decrease of nitrogen-fixing bacteria activity when it is less than 6, and the nitrification is inhibited when it is greater than 8.

2) The effectiveness of phosphorus is higher when it is smaller, because it is easy to form iron phosphate and aluminum phosphate when it is smaller, and the effectiveness is reduced, and when it is higher than that, it is easy to form calcium dihydrogen phosphate;

Fixation of inorganic phosphorus.

3) The leaching effect of acidic soil is strong, and potassium, calcium, and magnesium are easily lost, resulting in a deficiency of these elements. When the pH is higher, the soil sodium ions increase, and the calcium and magnesium ions are replaced to form carbonate precipitation, so the effectiveness of calcium and magnesium is best at pH 6-8.

4) The five trace elements of iron, manganese, copper, zinc and cobalt are highly effective because they are soluble in acidic soils; Molybdate is insoluble in acid but soluble in alkali, and is easily deficient in acidic soil; Borate is more effective at the time.

3. Improvement of soil acidity and alkalinity.

1. Improvement of soil acidic soil.

Lime is often used. To achieve the purpose of neutralizing active acids, latent acids, and improving soil structure.

Calcium-containing shell ash is used in coastal areas. Purple shale powder, fly ash, plant ash, etc. can also be used.

Lime application rate.

Quicklime requirement (g m2

Cation substitution amount*(1-salt base saturation)*soil weight*28*1 1000

2. Artificial acidification of neutral and calcareous soils.

Flowers in the open field can be made with sulfur powder (50 g m²) or ferrous sulfate (150 g m²) to reduce the pH unit. It can also be watered with alum fertilizer water.

3. Alkaline soil.

Gypsum can also be applied, phosphogypsum, ferrous sulfate, sulfur powder, acid weathered coal.

Soil acidity and alkalinity affect the physical and chemical properties of soil, and also directly affect the growth and development of flowers. Generally, flowers can grow well in neutral, weakly acidic, and weakly alkaline soils. Most flowers grow best in slightly acidic soils.

Because the nutrients required by flowers in this range are most available in the soil, it is conducive to the absorption and utilization of flowers. Soil over-acidity and alkalinity will directly affect the dissolution of mineral elements, so that some nutrients become inabsorbable, so that it is easy to cause nutrient deficiency in some flowers. Different kinds of flowers require different pH levels.

The adaptability of different flower species to soil pH can usually be judged based on the soil conditions of their native environment. The vast majority of ornamental plants prefer acidic to slightly acidic soil conditions, and some flower species prefer neutral to slightly alkaline soil conditions.

The flower species that like acidic soil conditions are: rowan, rhododendron, camellia, camellia, tea plum, red maple, white orchid, smiling, Milan, gardenia, pearl orchid, palm, jasmine, begonia, begonia, goldenrod tea, kumquat, cherry blossom, five-needle pine, podocarpus, bergamot, tortoiseshell, anthurium, bamboo, bamboo, junzi orchid, magnolia, plum blossom, camphor, heather, sandalwood, etc.

There are not many kinds of flowers that like alkaline, and the species of flowers and trees that have a certain resistance to salt and alkali are: tamarix, locust tree, pomegranate, elm leaf plum, oleander, spring, forsythia, woody fragrance, wolfberry, hibiscus, seaside hibiscus, crape myrtle, cloves, pear, acacia, fig, yueji, dragon cypress, juniper, oriental cypress, caryophyllus, torch tree, boxwood, etc.

The pigments contained in the flowers are equivalent to acid-base indicators.

You can experiment with purple litmus solution.

A common method is to measure the pH of plant juices.

If you sincerely want to raise, these are not problems, just check it on the Internet.