Soil management

Soil management refers to the collection of tillage, conservation, and cropping practices that are used to preserve soil resources while optimizing soil use.

Definition

Soils are managed differently depending on their intended use. Soil management groups are soil types with similar adaptations or management requirements for specific purposes, such as use with crops or cropping rotations, drainage, fertilization, forestry, highway engineering, and construction. For agriculture, soil management includes all tillage and planting operations, cropping practices, fertilization, liming, irrigation, herbicide and insecticide application, and other treatments conducted on or applied to the soil surface for the production of plants.

Overview

The most basic aspect of soil management is the way in which it is cultivated or tilled for crop growth. Tillage is the mechanical manipulation of the soil profile to modify soil conditions, manage crop residues or weeds, or incorporate chemicals for crop production. Tillage can be exhaustive or minimal. Conventional tillage uses multiple tillage operations to bury existing crop residue and prepare a uniform, weed-free seedbed for planting. This method breaks up soil aggregates in the process and destroys soil structure. Consequently, it can result in excessive wind and water erosion. Conservation tillage, or minimum tillage, involves soil management practices that leave much more crop residue on the soil surface and cause much less soil disruption. Contemporary soil management increasingly emphasizes soil health, including biological activity, organic matter content, and carbon cycling. Practices such as cover cropping, reduced tillage, and organic amendments support soil microbial communities that improve nutrient availability, water retention, and long-term productivity. As a result, the soil is less susceptible to erosion, and the plant residue acts as a mulch to protect the soil surface from the destructive impact of rainfall as well as to reduce evaporation. Soil management also plays a critical role in climate change mitigation and adaptation. Improved soil practices can increase carbon sequestration, reduce greenhouse gas emissions, and enhance resilience to droughts, floods, and extreme weather events. No-till, or chemical tillage, is a soil management practice adapted to sloping soils in which herbicides rather than tillage are used to control weeds, while the disruption of soil structure is limited to a narrow slit in the soil surface in which the seeds are planted.

Soil management extends to the way in which soils are manipulated. Terraces, for example, are raised horizontal strips of earth constructed along the contour of a hill to slow the movement of downward-flowing water. Tile drains are perforated ceramic or plastic pipes buried in poorly drained soils that act as underground channels to carry water away, lower the water table, and allow a soil to drain faster after rainfall. The benefit of managing potentially erodible soils on hill slopes as permanent pastures has gained increasing recognition. Likewise, the value of retaining wet soils as wetlands has been acknowledged. Wetlands provide wildlife habitat, assist in flood control, and act as buffers to protect surface waterways from nutrient and soil runoff from cultivated fields.

Soil management also involves the addition of chemicals to soil: lime to make acid soils more neutral; fertilizers to increase the nutrient level; herbicides and insecticides to control weed and insect pests; and soil conditioners to improve soil aggregation, structure, and permeability. A growing technology is the use of mobile global positioning system (GPS) units attached to the equipment that applies these chemicals to soil. Called “site-specific management,” it uses computer technology to regulate chemical addition based on the exact position in a field and previous yield or fertility maps that indicate whether the soil needs to be amended. In addition to GPS-guided equipment, modern site-specific management may incorporate remote sensing, satellite imagery, yield monitors, and variable-rate application technologies to refine input use and reduce environmental impact. The goal of site-specific management is to optimize chemical use and profit while minimizing potential chemical loss to other environments by only applying the chemicals to areas where they are needed. While these practices improve efficiency, soil management decisions are often influenced by environmental regulations, economic constraints, and regional conditions, requiring trade-offs between productivity and conservation goals.

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