If you want to change the acidity and alkalinity of flower soil, first understand the soil type.

Soil is an important matrix of flowers and one of the environmental factors for flowers to survive. Soil physical properties and soil pH play a certain role in the growth and development of flowers. So, how to change the soil pH?

Classification of soil texture

Soil texture refers to the physical condition of the soil, which reflects the degree of sand and stickiness of the soil. According to the degree of soil sand and stickiness, soil is generally divided into three categories: sand, clay and loam.

1. The gap of sandy soil is large and the soil moisture is low. The performance of ventilation and water permeability is good, but the performance of water and fertilizer conservation is poor.

two。 Clay soil has the advantages of small gap, poor ventilation and drainage, muddy when wet, hardened when dry, and strong ability to retain water and fertilizer.

3. Loam has the advantages of both sand and clay. Good ventilation and permeability, strong ability to retain water and fertilizer, suitable for flower growth.

Because the root system of flowers cultivated in open field can stretch freely, the underground part is required to have sufficient nutrition space, so it is necessary to choose loam cultivation land with deep soil layer, good ventilation and drainage conditions and certain fertility. The site preparation must be carried out before transplanting.

Through soil preparation, combined with the application of organic fertilizer, it can change the physical structure of soil, improve the aeration and permeability of soil, benefit the activity of soil microorganisms, accelerate the decomposition and transformation of organic matter, make the soil loose and facilitate the activity of root system. promote the growth and development of flowers. At the same time, it is necessary to loosen the soil and weed in time after transplanting, on the one hand, eliminate the hardening caused by irrigation and rainfall, make the topsoil loose, on the other hand, remove weeds.

Methods of changing soil pH

(1) add 0.5 kilogram of sulphur powder per cubic centimeter. The effect of sulfur powder is slow, but it lasts a long time. When the usage is small, add 1 tablespoon sulfur to the flowerpot with a diameter of 30 cm.

(2) the neutral soil can be changed into weakly acidic soil by adding 0.5-0.75 kg aluminum sulfate (alum) per cubic meter of cultivated soil. Potted flowers can also be irrigated with 1 ∶ 50 alum solution regularly.

(3) watering flowers with 1 ∶ 200ferrous sulfate (black alum) water, once every 7-10 days, and 15-20 days in winter. Black alum water has a quick effect, and the iron ions contained in it can promote the formation of chlorophyll, which can make the branches and leaves of flowers green after pouring. Families such as raising jasmine, camellia and other acidic flowers and trees can buy some black alum. Add 1g black alum to each pot and water 0.51kg.

Lime is often used to reduce soil acidity. The application amount can be determined according to the alkalinity of the soil. Generally, 0.25 kilograms of quicklime is added per cubic meter. There is a small amount of soil improvement by raising flowers in the family, which can be improved by adding limestone or lime wall shavings.