Land is the most important part of all life for all kinds of living things where land is a place of foothold, life, and doing all activities. Besides land, land is an important natural resource other than water and air. However, nowadays most people only pay more attention to water and air quality compared to soil quality. Even though high soil quality illustrates the quality of the environment and high soil fertility. So that soil quality becomes an important factor for plant growth.
Definition of soil quality
Soil quality is the capacity and ability of the soil to maintain crop productivity, maintain availability and maintain water, and maintain environmental quality. Land that has high quality will show a lack of pollution, on land, land subsidence does not occur, plants experience healthy and fertile growth and are safe for human consumption. Therefore the quality of the land must include:
- Land that can increase plant productivity and others
- Land that is able to support the health of living things
- Tanh is able to maintain environmental quality from the negative effects of environmental pollution
In measuring soil quality, there are three important indicators, namely physical, chemical, and biological biology indicators. Physical indicators are indicators that include soil texture, soil depth, and the ability of the soil to store and absorb water. Physical indicators provide an overview of the content of organic matter found in the soil, how quickly water enters the soil, and how small or large the pores are on the soil. Physical indicators also describe the physical conditions that exist in the soil so that it becomes an important factor in how to treat the soil.
The second is a chemical indicator. Chemical indicators include soil pH (acid or soil base), and nutrient and nutrient content in the soil. Chemical indicators are important factors in measuring soil quality because they are key to the production and growth of plants and microorganisms on the soil. And the last is the biological indicator of the soil. Biological indicators include temperature on the ground, transpiration and soil respiration, and the C / N ratio (ability of the soil to decompose organic matter into nutrients and nutrients by microorganisms). This indicator is the most sensitive indicator of changes that occur on the ground, because it shows that the land has decreased in quality and is exposed to pollution or pollution.
Relationship between soil quality and sustainable agriculture
Sustainable agriculture is an agricultural system that combines ecological, biological and chemical aspects such as the use of organic fertilizers to supplement nutrient needs in plants, reduce the use of chemicals, and use natural resources more effectively for the environment, especially so that high soil quality can maintained. Long-term agriculture provides long-term benefits in its use:
- Increase plant productivity, quality and safety
- Maintain and protect the environment
- The agricultural sector can survive natural and human factors that damage and pollute the environment.
Sustainable agriculture has the above impact because y in maintaining the quality of soil on the land, using microorganisms that are useful to restore nutrient content and nutrients to the soil used by plants by decomposing plant residues so that nutrients and nutrients from decomposition can be used again by plants which will be cultivated in the future and the use of chemical fertilizers can be suppressed. In addition to more efficient use of fertilizers, sustainable agriculture also uses natural and biological pest control using predatory pest microorganisms so that the use of pesticides that pollute the environment can be reduced.