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The pH of the soil has a significant impact on crops, just give it a try!

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The pH of the soil has a significant impact on crops, just give it a try!

Update Time:2023/7/24
Soil acidity and alkalinity are one of the important factors affecting soil nutrient availability, and the magnitude of soil nutrient availability is closely related to the absorption and utilization rate of fertilizers; Neutral soil has the highest nutrient availability and the highest fertilizer utilization rate. The acidity and alkalinity of soil are commonly represented by pH value, which refers to the degree of acidity and alkalinity of the soil. The soil acidity and alkalinity are divided into 7 levels, and the grading indicators and pH value reflect the intensity as follows: 4.5 is extremely acidic; 4.5-5.5 Strong acidity; 5.5-6.5 Acidity; 6.5-7.5 neutral; 7.5-8.5 Alkalinity; 8.5-9.5 Strong alkalinity; 9.5 Extremely alkaline.

1、 Impact on plants
(1). Most plants find it difficult to grow at pH>9.0 or<2.5. Plants can grow normally over a wide range, but each plant has its own suitable pH.
Acidophilic plants: Cuculus, Vaccinium, Camellia, Chinese fir, pine, Hevea brasiliensis, and Shigella scoparia;
Calcium loving plants: Alfalfa, melilotus, southern India, cypress, linden, elm, etc;
Saline alkali loving plants: Tamarix, Elaeagnus angustifolia, goji berries, etc.

(2). Plant diseases and pests are directly related to soil acidity and alkalinity:
(a) Underground pests often require a certain range of pH environmental conditions, such as bamboo locusts like acid and Scarabaeidae like alkali;
(b) Some diseases only occur within a certain pH range, such as wilt disease, which often occurs on alkaline and neutral soils.

(3). Soil active aluminum:
The exchangeable aluminum adsorbed on soil colloids and aluminum ions in soil solutions are important ecological factors that have a significant impact on the distribution, growth, and succession of natural vegetation;

2、 Identification of soil acidity and alkalinity
(1).Judging acidic and alkaline soils through soil sources
The soil in mountains and forests, as well as the humus soil in gullies, is generally black or brown soil, which is relatively loose, fertile, and has good permeability, making it a very good acidic humus soil. For example, pine needle humus, peat humus, etc.

(2). Judging acidic and alkaline soils through surface plants
When collecting soil samples, one can observe the plants growing on the surface. Generally, the soil where pine trees, fir plants, and azaleas grow is mostly acidic soil; The soil in areas such as millet, sorghum, and halogenated rice is mostly alkaline.

(3). Judging acidic and alkaline soils by soil color
Acidic soil is generally darker in color, mostly black brown, while alkaline soil is mostly light in color such as white and yellow. In some saline alkali areas, there is often a layer of white saline alkali on the soil surface.

(4). Judging acidic and alkaline soils through hand feel
Acidic soil is generally soft when held in the hand, and when released, the soil is easily dispersed and not prone to clumping; Alkaline soil feels quite firm when held in the hand, and it is easy to clump and not scatter when released.

(5). Judging acidic and alkaline soils by their state after watering
After watering in acidic soil, it infiltrates quickly without white bubbles, and the water surface is relatively muddy; After watering alkaline soil, the infiltration is slower, and white bubbles appear on the water surface, sometimes with a layer of white alkaline substance on the surface.

(6). Judging acidic and alkaline soils based on their texture
Acidic soil has a loose texture and strong air and water permeability; Alkaline soil has a hard texture and is easy to harden into blocks, making it easy for the soil to harden.

Put a small amount of the soil sample into distilled water, dissolve it for a while, place the pH test strip in it and let it stand for 2 seconds, then take it out and compare it with the colorimetric card. If pH>7, it is alkaline soil, and if pH<7, it is acidic soil.