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In some plants,stems and leaves appear scorching and shrinking,and some even die.Some pest structures also change.This is what the performance of continuous cropping obstacle in different crops.
Most of us are familiar with powdery mildew,from field to greenhouse, from vegetable garden to orchard garden,it can be said that it appears in most places with crops.Once the crop is infected with powdery mildew,it is rapidly developed and difficult to control, often causing serious problems.
|powdery mildew on wheat|
|Powdery Mildew on melons|
|Powdery mildew on strawberry|
In this article,We will know the essential problems in soil,all of them can not be neglected.Now let's go into these problems.
More info of Soil problems Read more
How to solve the these problems Read more
Soil hardeningSoil hardening means that soil structure is destroyed,the tillage layer is hardened,and the air permeability is poor.It seriously affect the normal growth of crop roots.
The input of organic fertilizer is seriously insufficient: the content of organic matter in the soil is low and the structure is deteriorated, which affects the activity of microorganisms, thereby affecting the formation of soil aggregate structure and leading to soil hardening.Long-term excessive application of chemical fertilizers: It destroyed the soil structure, and soil organic matter could not be replenished in time,causing soil hardeningand cracking.Agricultural measures such as repression, plowing, and watering have resulted in damage to the upper soil aggregate structure.
Root absorbing ability declines. In the case of soil hardening, lack of oxygen causes a decrease in root vigor, does not develop normally, and weakens the respiration, affecting the absorption of nutrients.Lead to nutrients deficiency symptoms. As root capacity declines, the ability to absorb water and fertilizers weakens,together with poor soil nutrient availability,lead to nutrients deficiency symptoms.
The imbalance of mineral nutrition ratio
Crop growth requires 17 kinds of essential nutrients.In daily management,only nitrogen,phosphorus,and potassium fertilizers are emphasized,and trace elements are neglected.As a result, trace elements in the soil are depleted, and NPK are enriched.
With more and more fertilizer inputs, the yield and quality of fruits and vegetables have not been improved, but have shown a downward trend.
Physiological nutrients deficiency symptoms. Such as calcium, magnesium, iron and so on.Poor growth of crops and reduction of quality of agricultural products.
Low organic matter content
Soil organic matter is an important part of the soil structure and an important indicator of soil fertility.
At present, the number of crop replanting increases, excessive application of chemical fertilizers, and organic fertilizer application is seriously inadequate or the use of methods is unreasonable.
The loss of soil orgarmnic matter is serious, the structure of the soil pellets is destroyed, the soil water conservation, fertilizer retention capacity, permeability and buffering performance are reduced, and the crop yield and economic benefits are seriously affected.
Thinner plough layer
Soil hardening means that the soil structure is destroyed,the tillage layer is hardened,and the air permeability is poor.Seriously affect the normal growth of crop roots.
Due to the long-term use of rotary cultivators, most of the soil cultivating layer becomes shallow, and the effective living soil layer is only 15 to 20 cm.
The formation of the “plough bottom” has hindered the circulation of soil moisture, nutrients, and air, hindered the extension of the roots of the crop, reduced the ability of the soil to store water, and drought resistance ability.