1, Tillage Method
In the agricultural tillage process, many people choose rotary tillage operations, such tillage can achieve the benefits of flat surface, fine soil, saving time and labor, and thus higher popularity, but the depth of rotary tillage is often too shallow, the texture of farmland soil is too sticky, clay soil with more clay particles, plus the average tillage layer is less than 20 centimeters, the soil has fewer capillary pores, less aeration, water permeability, temperature increase, after the rain, easy to clogging pores, resulting in soil surface crust.
2, Excessive Use of Chemical Fertilizers
(1) People often ignore the harmful effects of chemical fertilizers in the use of fertilizers. Excessive and frequent use of chemical fertilizers, resulting in a reduction in the amount of straw returned to the field, so that the soil is not enough organic material, low soil organic content, poor structure, soil nutrient imbalance, especially the use of potassium fertilizer and ammonium nitrogen fertilizer, a cause of soil grain structure damage, affecting the activity of microorganisms, resulting in soil acidity and alkalinity too large or too small, resulting in soil crusting.
(2) Organic fertilizer application is seriously insufficient, heavy nitrogen and light phosphorus and potassium fertilizer, soil organic matter decline, humus can not be timely replenishment, causing soil slating and cracking.
3, The use of Plastic Products
In the facility shed, because the mulch and plastic bags, etc. are not cleaned up, they cannot be completely decomposed in the soil and form harmful lumps. China's annual waste plastic with domestic waste into the landfill, accounting for 3%-5% of the weight of landfill waste, most of which is plastic bag waste, applied to the soil is not easy to degrade, resulting in soil consolidation.
4, Machine Suppression, Tillage
Due to the influence of mechanical tillage too deep, it destroys the soil agglomerate structure. And only part of the fertilizer applied into the soil each year is absorbed and used by the current season's crops, and the rest is fixed by the soil, forming a large number of acidic acid deposits, causing soil slumping.
5, Irrational Irrigation
Due to people's unreasonable drought, the use of large water irrigation, coupled with dry climate and other factors, making most of the water evaporated in a short period of time, resulting in soil surface slabbing, may also cause flooding water sink phenomenon, resulting in serious damage to the soil grain structure, the formation of soil slabbing.
6, The Accumulation of Harmful Substances in the Soil
Some places have high content of groundwater and industrial wastewater and toxic substances, and the accumulation of excessive toxic substances by long-term use of irrigation causes surface soil slabbing.
7, Storm Water Erosion
The fine soil particles in the topsoil layer are carried away after heavy rainfall, causing damage to the soil structure.