TASC Agricultural Systems key terms

A farm or farming region treated as an ecosystem, where crops, livestock, soil, water, pests, and people interact through nutrient flows and energy exchange.

The organized combination of land, labor, capital, inputs, technology, and management that a producer uses to raise crops or animals and market the resulting products.

The pattern and sequence of crops grown on a field over time, including rotation order, planting dates, tillage, and residue handling.

Growing different crops in a planned sequence on the same land across seasons to disrupt pest cycles, balance nutrients, and reduce soil erosion and weed pressure.

The practice of growing one crop species over a large area or repeated seasons, which simplifies management but can concentrate pests and deplete specific nutrients.

A non-harvested plant grown between cash crops to protect soil from erosion, add organic matter, suppress weeds, and capture leftover nutrients.

A cover crop that is deliberately plowed or incorporated into the soil while still green so its nutrients and organic matter benefit the next crop.

The decomposed and partially decomposed plant and animal material in soil, which improves water holding, structure, and nutrient supply.

The stable, dark, fully decomposed fraction of soil organic matter that resists further breakdown and helps soil retain water and nutrients.

The soil's ability to hold positively charged nutrient ions such as calcium, magnesium, and potassium on clay and organic matter surfaces for plant uptake.

A measure of soil acidity or alkalinity on a 0 to 14 scale that controls which nutrients remain available to plant roots.

The movement of nutrients such as nitrogen and phosphorus among soil, plants, animals, water, and air, returning them to forms crops can use again.

The conversion of atmospheric nitrogen gas into forms plants can use, carried out by certain bacteria in soil or in root nodules of legumes.

A plant family member such as alfalfa, clover, soybean, or pea that often hosts nitrogen-fixing bacteria in root nodules and produces protein-rich seed or forage.

A material applied to soil or plants to supply essential nutrients, described by its nitrogen, phosphorus, and potassium content and its release rate.

A written schedule that matches nutrient applications to crop needs, field conditions, and environmental limits to maximize uptake and reduce runoff losses.

A decision process that combines monitoring, cultural practices, biological controls, and judicious pesticide use to keep pests below economically damaging levels.

The pest population level at which the value of crop loss prevented by treatment equals the cost of that treatment, signaling when control is justified.

Using living organisms such as predators, parasitoids, or pathogens to suppress pest populations as an alternative or supplement to chemical pesticides.

Systematically inspecting fields on a regular schedule to identify pests, weeds, diseases, and crop growth stages so management decisions rest on current field evidence.

The variety of plants, animals, and microorganisms in a farming landscape, which supports pollination, pest control, soil health, and system resilience.

Any tillage and planting system that leaves crop residue covering at least thirty percent of the soil surface after planting to reduce erosion and conserve moisture.

A planting system that disturbs soil only in a narrow band at seeding, leaving the previous crop's residue and soil structure largely intact year round.

The detachment and movement of topsoil by wind, water, or tillage, which removes the most fertile layer and reduces long-term field productivity.

Water that flows across the soil surface instead of soaking in, carrying dissolved nutrients, sediment, and applied chemicals toward streams and lakes.

Supplying water to crops artificially when rainfall is insufficient, using methods such as drip, sprinkler, or furrow systems chosen to fit soil and crop needs.

Removing excess water from soil through surface channels or underground tile so roots receive oxygen and fields can be worked on schedule.

The upper boundary of saturated soil or rock below the surface, which influences root depth, drainage needs, and how quickly applied nutrients move downward.

A hoofed animal such as cattle, sheep, or goats with a multi-chambered stomach that ferments fibrous forage using microbes, converting roughage into energy.

Vegetative plant material such as grass, hay, or silage harvested or grazed to feed livestock, forming the base ration for many ruminant operations.

Planning when, where, and how long livestock graze so pasture plants recover, soil stays covered, and animals receive adequate nutrition.

The amount of feed consumed per unit of animal weight gain or product output, a key measure of livestock enterprise efficiency and cost.

A single production activity on a farm, such as a corn field, a dairy herd, or a pumpkin patch, whose costs and returns can be budgeted separately.

An enterprise's income minus its variable costs, used to compare the profitability of alternative crops or livestock activities before fixed costs are allocated.

An expense that changes with the level of production, such as seed, fertilizer, fuel, or hired labor, and is charged to the enterprise that incurs it.

An expense that stays roughly the same regardless of how much is produced in a season, such as land taxes, insurance, or machinery ownership costs.

Adding new enterprises, crops, or marketing channels to a farm business to spread risk, use resources more fully, and stabilize income across years.

The linked steps that move a farm product from production through processing, distribution, and sale to the final consumer, each adding cost and value.

A soil amendment made from ground limestone that raises soil pH and supplies calcium, used when soil tests show excessive acidity.