Soil is a precious agricultural natural resource. The level of crop yields and the amount of harvests largely depend on the fertility of the farmland soil. Once the soil structure and the plough layer of the soil are damaged, and the soil quality deteriorates, crops will be like trees without roots and water without a source. It will not only be difficult to achieve high yields, but also reduce the service life of cultivated land. Only by attaching importance to the protection and improvement of the soil and avoiding soil deterioration can crops achieve high yields and high efficiency.
The granular structure of the soil, the organic matter, and the soil microorganisms form an organic system that interacts with and influences one another, determining the fertility level of the soil and the quality of the soil environment.
The granular structure of the soil provides storage space for organic matter and a living environment for soil microorganisms. At the same time, organic matter and microorganisms also affect the formation and maintenance of the granular structure. Without abundant organic matter and microorganisms, it is difficult for the granular structure to persist. Between organic matter and microorganisms, organic matter must be transformed by soil microorganisms before it can be absorbed and utilized by plants. Without microorganisms, organic matter cannot be transformed and utilized. The survival and source of nutrients (food) for microorganisms, in turn, rely on organic matter. Therefore, to manage and repair damaged soil, it is necessary to focus on three aspects: the restoration of the granular structure, the enhancement of organic matter, and the replenishment of microorganisms.
Soil deterioration is mainly reflected in aspects such as soil compaction, soil salinization, soil flora imbalance, and soil acidification.

Reasons for the Formation of Soil Compaction
The insufficient organic matter in the soil, and the excessive application of nitrogen fertilizers while neglecting the application of phosphorus and potassium fertilizers, lead to serious damage to the soil granular structure. This reduces soil air permeability, decreases the activity of aerobic microorganisms, and slows down the soil ripening process, thus causing soil compaction.
Harm Caused
The harm of soil compaction to crops is twofold. Firstly, it is difficult for the roots to penetrate downwards. Secondly, even if the roots can penetrate, the phenomenon of waterlogging of roots will occur due to the excessively low oxygen content in the soil.
Solutions
Increase the application amount of organic fertilizers and reduce the application amount of chemical fertilizers; practice water-saving irrigation and try to use surface water; promote the returning of crop straws to the field, advocate no-tillage farming, and reduce soil erosion; use soil conditioners.
Soil salinization

Reasons for Formation
Long-term excessive application of chemical fertilizers, insufficient application of organic fertilizers, and an unreasonable proportion of nitrogen, phosphorus, and potassium fertilizers lead to an increase in salt ions in the soil. This hinders the normal water absorption of the roots, affecting the growth of plants. The aggravation of soil salinization further obstructs the normal water absorption of the roots and impacts the growth of plants.
Harm Caused
Due to the increase in soil salinity, crops have difficulty absorbing water, resulting in poor root growth and reduced stress resistance. Crops are prone to "physiological drought" and may die. Because there are too many soluble salts in the soil, the osmotic potential increases, which reduces the soil water potential, leading to a lack of nitrogen, phosphorus, and potassium nutrients and restricting the growth of crops. In more severe cases, it can lead to salt damage and the death of crops.
Solutions
Increasing the application of organic fertilizers, balanced fertilization, returning crop straws to the field, turning over and pressing green manure and forage grass, and using humic acid fertilizers can improve saline-alkali soil, achieving the effects of desalination and soil fertility improvement.
Soil flora imbalance

Reasons for Formation
Some of the biological bacteria in the soil are beneficial bacteria, which can improve the environment for root growth. There are also some harmful bacteria, which can cause soil-borne diseases, leading to the death of seedlings and plants. Due to high-intensity intensive farming, a high multiple cropping index, and a large amount of fertilizers and pesticides used, the soil granular structure is damaged. The number of harmful bacteria in the soil is increasing, while beneficial bacteria are not replenished, resulting in an imbalance of the soil flora.
Harm Caused
It can lead to soil compaction, acidification, salinization, poor permeability, inability to retain water and fertilizers, nutrient deficiency, exhaustion of soil fertility, and the occurrence of soil-borne diseases, etc.
Solutions
Increase the application of microbial inoculants, compound microbial fertilizers, biological organic fertilizers, etc.

Reasons for the Formation of Soil Acidification
Excessive use of chemical nitrogen fertilizers and physiologically acidic fertilizers leads to an increase in acidic substances in the soil, resulting in soil acidification.
Harm Caused
Soil acidification will inhibit root development, aggravate soil compaction, making it difficult for roots to extend. The ability to generate new roots is weak, and it is difficult to slow down the growth of seedlings. It is easy to form old and small trees and stunted seedlings. Soil acidification can also lead to a significant reduction in the absorption and utilization rate of most medium and trace elements, and serious nutrient loss. In an acidified soil environment, a large number of harmful microorganisms in the rhizosphere multiply, and the population of beneficial soil microorganisms changes.
Solutions
Fertilize scientifically, use high-nitrogen chemical fertilizers in an appropriate amount or reduce their use; increase the application of organic fertilizers, and use biological organic bacterial fertilizers that can regulate the soil pH value to cultivate microorganisms and improve the soil structure, preventing acidification and compaction; supplement medium and trace element fertilizers; spread lime and plow the land every other year. (Source: Internet)
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