VCE Agricultural and Horticultural Studies key terms

The amount of usable product harvested from a crop or animal system per unit area or per animal, usually expressed in tonnes per hectare or litres per cow.

The number of animals carried on a given area of land, commonly expressed as dry sheep equivalents per hectare, which influences pasture use and environmental impact.

The maximum number of animals or level of production an area can support over the long term without degrading soil, pasture or water resources.

The difference between the income from an enterprise and its variable costs, used to compare the profitability of alternative farm enterprises.

A cost that changes in proportion to the level of production, such as seed, fertiliser, fuel or animal health treatments, and is subtracted when calculating gross margin.

An expense that must be met regardless of production level, such as rates, insurance, machinery depreciation or permanent labour, and does not vary with output.

The relative proportions of sand, silt and clay particles in a soil, which determine its drainage, water-holding capacity and workability.

The way soil particles bind together into aggregates or peds, influencing pore space, root penetration, aeration and resistance to erosion.

A measure of the acidity or alkalinity of soil on a scale from 1 to 14, affecting the availability of nutrients to plants.

The ability of a soil to retain water within its pores after drainage, making moisture available to plant roots between rainfall or irrigation events.

Saturation of soil pores with water that excludes air, restricting root respiration and often reducing plant growth or killing sensitive species.

The accumulation of soluble salts in soil or water to levels that reduce plant growth, often caused by rising water tables or irrigation with salty water.

Water held beneath the soil surface in saturated rock or sediment, which can rise and contribute to dryland salinity when water tables are high.

The detachment and transport of soil by wind or water, accelerated by loss of vegetation cover and often reducing long-term productive capacity of land.

The suitability of land for a particular use, such as cropping or grazing, based on its slope, soil, climate and susceptibility to degradation.

The downward movement of soluble nutrients beyond the root zone with draining water, wasting fertiliser and potentially polluting groundwater and waterways.

A material applied to soil or plants to supply essential nutrients such as nitrogen, phosphorus and potassium to improve growth and yield.

Planning when and how much water to apply to a crop, based on plant needs, soil moisture and evaporation, to avoid waste and stress.

Growing different plant species in sequence on the same land to break pest and disease cycles, manage nutrients and maintain soil health.

A period in which land is left without a crop, usually to conserve soil moisture and accumulate nutrients before the next cropping phase.

A strategy combining biological, cultural, physical and chemical controls to manage pests while minimising pesticide use and resistance development.

The use of natural enemies such as predators, parasites or pathogens to reduce pest populations as an alternative to chemical treatment.

The inherited ability of a pest population to survive doses of a pesticide that would normally kill it, often arising from repeated use of one chemical group.

The minimum time that must pass between applying a chemical and harvesting or slaughtering, ensuring residues fall below permitted limits.

Practices that prevent the introduction and spread of pests, diseases and weeds onto a property, such as hygiene, quarantine and movement controls.

A disease that must by law be reported to authorities when suspected, so that outbreaks can be investigated and controlled quickly.

The isolation or restriction of movement of animals, plants or products to prevent the spread of disease or pests into or within an area.

The physical and psychological wellbeing of animals, judged by measures such as health, comfort, nutrition, safety and ability to express natural behaviour.

The number of animals per unit of space in a shed, feedlot or paddock, which affects welfare, disease spread and production performance.

A framework describing animal welfare needs: freedom from hunger and thirst, discomfort, pain, injury or disease, fear and distress, and freedom to express normal behaviour.

The condition of a plant free from disease, pest damage and nutrient deficiency, enabling it to grow and reproduce normally.

An organism, such as an insect or nematode, that transmits a pathogen from one host plant or animal to another.

Managing a farm so that production meets present needs while maintaining soil, water, biodiversity and economic viability for future generations.

An approach to assessing farm performance against three dimensions: economic profit, environmental impact and social responsibility.

Using technologies such as GPS guidance, sensors and variable-rate application to manage inputs at fine scale within a paddock, improving efficiency and reducing waste.

A written document setting out a farm enterprise's goals, production strategy, market analysis, resource needs and financial projections.

The sequence of steps and businesses that move a product from farm through processing, transport and distribution to the final consumer.

Processing or presenting a raw farm product in a way that increases its market price, such as turning milk into cheese or grapes into wine.