Praxis Agriculture key terms

The practice of growing a single crop species across a field or farm for successive seasons. It simplifies management and equipment but raises risk from pests, disease, and soil nutrient depletion.

A planned sequence of different crops on the same land over multiple seasons. Alternating crops interrupts pest and disease cycles, varies root depth, and helps balance soil nutrients, especially nitrogen when legumes are included.

A non-cash plant grown mainly to protect and improve soil between cash crops. It reduces erosion, suppresses weeds, adds organic matter, and may scavenge or fix nutrients for the following crop.

A cover crop that is deliberately plowed or incorporated into the soil while still green to add organic matter and nutrients. Legume green manures also contribute biologically fixed nitrogen to the next crop.

A plant in the pea family that forms a symbiotic relationship with rhizobia bacteria in root nodules, converting atmospheric nitrogen into plant-usable forms. Common agricultural examples include alfalfa, clover, soybeans, and peas.

The conversion of atmospheric nitrogen gas into ammonia or other compounds plants can use. In agriculture, biological fixation by rhizobia in legume nodules is the most important route, supplementing or replacing synthetic nitrogen fertilizer.

A genus of soil bacteria that infect legume roots and form nodules where they fix atmospheric nitrogen for the host plant. Inoculating seed with the correct strain is common when a legume is new to a field.

A conservation tillage system in which the soil is left undisturbed between crops and seed is placed directly into residue. It reduces erosion and fuel use and builds organic matter, but often requires different weed and residue management.

Any tillage system that leaves substantial crop residue on the soil surface to protect it from erosion. It includes no-till, strip-till, and mulch-till, and generally improves water infiltration and soil organic matter over clean tillage.

The detachment and movement of topsoil by wind or water. It reduces productivity by removing nutrient-rich surface soil and can pollute waterways; control relies on residue cover, contour farming, terraces, and vegetative barriers.

A measure of soil acidity or alkalinity on a 0 to 14 scale. It strongly affects nutrient availability, microbial activity, and crop choice; lime raises pH and sulfur or acidifying fertilizers lower it.

The soil's ability to hold positively charged nutrient ions such as calcium, magnesium, and potassium on clay and organic matter surfaces. Higher capacity generally means greater nutrient retention and buffering against change.

A soil amendment, usually ground limestone, applied to raise soil pH and supply calcium or magnesium. Application rate depends on soil test results, target pH for the crop, and the material's neutralizing value.

Laboratory analysis of a soil sample to estimate pH, nutrient levels, and sometimes organic matter or texture. Results guide fertilizer and lime recommendations, and sampling depth and timing must be consistent for useful comparisons.

The living, dead, and decomposed plant and animal material in soil. It improves water-holding capacity, structure, and nutrient supply, and is a key indicator of long-term soil health in cropping systems.

A decision-making approach that combines biological, cultural, mechanical, and chemical controls, using monitoring and economic thresholds to apply pesticides only when justified. It aims to reduce costs and environmental risk while controlling pests.

The pest population level at which the value of crop loss prevented exceeds the cost of treatment. It is the practical trigger for intervention within integrated pest management and varies with crop value and control cost.

Systematic field inspection to detect pests, diseases, weeds, and crop problems early and to estimate their populations. Regular scouting provides the data needed to apply thresholds and to time control measures accurately.

Using natural enemies such as predators, parasitoids, and pathogens to suppress pest populations. It can be conserved, augmented, or introduced, and is a core tactic within integrated pest management programs.

The inherited ability of a pest population to survive a pesticide dose that would normally kill it, developing after repeated exposure. It is managed by rotating mode-of-action groups, tank mixing, and nonchemical controls.

The legally binding instructions and warnings supplied with a pesticide product. It specifies approved sites, rates, application methods, protective equipment, reentry intervals, and preharvest intervals that applicators must follow.

The minimum number of days that must pass between the last pesticide application and harvesting the crop. It exists to keep residues within legal tolerances and is stated on the product label.

The improved performance, such as higher yield or vigor, of a cross between genetically distinct parents compared with either parent. It underlies the productivity of many commercial corn, sorghum, and vegetable hybrids.

A plant variety developed and maintained through breeding and selection for specific traits such as yield, maturity, or disease resistance. Cultivar choice is a key management decision matched to local climate and markets.

The process by which a seed resumes growth and produces a seedling, requiring adequate moisture, temperature, and oxygen. Seedbed preparation and planting depth strongly influence germination uniformity and stand establishment.

A hoofed animal such as cattle, sheep, or goats with a multi-chambered stomach whose rumen hosts microbes that digest fibrous feed. Ruminants convert forages and byproducts into meat and milk that humans cannot otherwise use.

The largest stomach chamber of a ruminant, where a dense microbial population ferments fibrous feed into volatile fatty acids. Its health depends on adequate fiber, gradual diet changes, and stable pH.

A feeding method in which forages, grains, protein supplements, minerals, and vitamins are blended into one uniform mix. It prevents selective eating and helps stabilize rumen fermentation in dairy and feedlot operations.

Plant material such as pasture, hay, or silage fed to livestock, usually high in fiber. Forage quality depends on species, maturity at harvest, and preservation method, and strongly affects animal performance and feed cost.

Fermented, high-moisture forage preserved in an oxygen-limited environment, often in a silo or bunker. Proper wilting, packing, and sealing promote lactic acid fermentation and prevent spoilage that reduces feed value.

Formulating a diet that meets an animal's nutrient needs for its production stage while controlling cost. It considers energy, protein, minerals, and vitamins relative to requirements and feed analysis values.

The physical and mental state of an animal as it copes with its environment, often assessed through health, behavior, and stress indicators. Good welfare includes adequate space, water, feed, and handling practices.

The vertical arrangement of soil layers, called horizons, from the surface down to parent material. Horizon properties such as color, texture, and structure reveal drainage, organic matter, and suitability for farming.

The relative proportions of sand, silt, and clay particles in soil. Texture influences water-holding capacity, drainage, aeration, and nutrient retention, and is determined in the field by feel or in the lab by particle analysis.

A bulk farm product such as corn, wheat, soybeans, or cattle that is traded in standardized grades and units. Prices are driven by supply, demand, weather, and market speculation rather than brand.

A legally binding agreement to buy or sell a standardized quantity of a commodity at a set price on a future date. Producers use futures to manage price risk, while speculators accept risk seeking profit.

Taking an offsetting position in a futures or options market to reduce price risk on a physical commodity. A farmer may sell futures to lock in a price before harvest, protecting against a later price decline.