For high polymer soil amendments, such as polyacrylamide, solid application into the soil can absorb water and expand, but structural amendments are difficult to dissolve into the soil solution. Expansive amendments that do not enter the soil solution have almost no soil improvement effect. If they are dissolved in water and applied, the physical properties of the soil can be significantly improved.
Therefore, currently, water-soluble soil amendment sulfur powder is widely used, and spraying and irrigation techniques are often used. However, for the greening and improvement of large deserts and deserts, spraying and irrigation techniques are difficult to apply due to limitations such as water content.
Soil amendments should be applied when the surface soil moisture is suitable, and the best effect is achieved when the soil moisture is 70% -80% of the maximum field capacity. In recent years, due to the improvement of application methods from solid-state to liquid state, the requirements for soil moisture during application have changed from before.
Increasing soil organic matter can have a dual effect of improving soil physical properties and increasing soil nutrient content. However, the source of organic fertilizer is limited and difficult to meet the requirements, while soil amendments can be artificially synthesized with a wide range of sources. It is feasible to replace organic matter in soil improvement. The simultaneous use of both can not only improve soil structure, but also make up for the problem of insufficient organic matter sources.
Long term application of large amounts of chemical fertilizers can easily cause soil compaction, deterioration of physical and chemical properties, and pollution of the soil. The use of soil amendments or fertilizers alone is not effective in soils with poor structure and low fertility. Simultaneously using can significantly increase yield.