Agronomist dictionary

Growth and development

Physiological aging

An irreversible process of gradual decline in metabolic activity and adaptive capacity of a plant, leading to the completion of its life cycle.

Storage and economics

Physiological maturity

The stage of plant development when seeds or fruits reach their maximum dry weight and are fully capable of germination.

Crop protection

Phyto-examination

Phyto-examination is a comprehensive laboratory analysis of seeds or plants to detect latent infections and assess their phytosanitary status.

Crop protection

Phytocenosis

Phytocenosis is a stable plant community consisting of various species growing in a specific area and interacting with each other and their environment.

Crop protection

Phytopathogen

A phytopathogen is a biological agent, such as a fungus, bacterium, virus, or nematode, that causes infectious diseases in plants.

Crop protection

Phytophage

A phytophage is a herbivorous animal or insect that feeds on plant tissues and is often classified as a crop pest.

Crop protection

Phytosanitary control

A set of regulatory measures designed to prevent the introduction and spread of plant pests, diseases, and weeds in agricultural products.

Crop protection

Phytosanitary status

A comprehensive assessment of crops based on the presence and prevalence of pests, diseases, and weeds in a specific area.

Crop protection

Phytotoxicity

Phytotoxicity is the capacity of a substance or environmental condition to cause damage, growth inhibition, or death in plants.

Growth and development

Plant antioxidant system

This is a complex set of enzymatic and non-enzymatic defensive mechanisms that neutralize reactive oxygen species to protect plant cells from environmental stre...

Sowing and varieties

Plant density

The number of living crop plants per unit area of a field at a specific stage of development.

Soil and tillage

Plant feeding area

This is the space allocated to an individual plant within a field, from which it extracts the nutrients, moisture, and light required for development.

Crop protection

Plant growth regulator

Organic compounds, either natural or synthetic, that modify plant growth processes such as stem elongation, germination, or flowering.

Nutrition and fertilizers

Plant growth retardants

Plant growth retardants are chemical substances used to suppress stem elongation, resulting in shorter, sturdier, and more resilient plants.

Weather and climate

Plant hardening

The practice of gradually exposing indoor-grown seedlings to outdoor conditions like cooler temperatures and wind to prepare them for transplanting.

Soil and tillage

Plough pan

A plough pan is a compacted soil layer formed below the depth of cultivation, caused by the repetitive mechanical pressure of tillage equipment.

Soil and tillage

Ploughing

A primary tillage operation where soil is cut, turned over, and loosened using a plough to prepare the seedbed.

Machinery and irrigation

Pneumatic seeding system

A technology for delivering seeds to the furrow openers using a directed stream of compressed air.

Storage and economics

Porosity of grain bulk

Porosity is the fraction of the volume of voids between grain kernels relative to the total volume of the grain bulk.

Breeding and seed production

Post-control

Post-control in agronomy is the systematic assessment of the efficacy of pesticides and agrochemicals applied to crops after a specific period following the tre...

Growth and development

Post-embryonic development

This is the stage of a plant's life cycle that begins after seed germination and continues until death or the completion of its life cycle.

Storage and economics

Post-harvest processing line

A system of interconnected machinery designed for the continuous cleaning, drying, and sorting of grain immediately after harvest.

Nutrition and fertilizers

Potassium fixation

The process where potassium ions are trapped within the lattice structure of clay minerals, rendering them unavailable for plant uptake.

Weather and climate

Potential evapotranspiration

This is the maximum amount of water that would evaporate from soil and transpire from plant surfaces if water supply were not limited.

Breeding and seed production

Pre-basic seeds

The highest category of seeds produced under the direct responsibility of the breeder to maintain the genetic purity and identity of the variety.

Crop protection

Pre-harvest interval

The minimum required time between the final pesticide application and the harvest to ensure that residue levels in the produce are within safe regulatory limits...

Sowing and varieties

Pre-harvest moisture content

The percentage of water present in seeds or plant material just before harvest, which determines the timing for gathering crops and their storability.

Soil and tillage

Pre-sowing cultivation

This is the final soil tillage operation before seeding, designed to loosen the topsoil and prepare a uniform, firm seedbed.

Weather and climate

Precipitation sum

This is the total volume of moisture, such as rain, snow, or dew, that has fallen on a specific area over a given period, typically measured in millimeters.

Machinery and irrigation

Precipitation uniformity

A metric describing the degree of spatial consistency of rainfall across a field throughout the growing season.

Digital farming

Precision agriculture

A management strategy that uses information technology to ensure that crops and soil receive exactly what they need for optimum health and productivity.

Digital farming

Precision Agriculture Navigation

The use of satellite positioning systems in farming equipment to ensure accurate field coverage and reduce overlaps during field operations.

Machinery and irrigation

Prescription map

A digital file that provides instructions to agricultural equipment to automatically adjust application rates for seeds, fertilizers, or chemicals across a fiel...

Machinery and irrigation

Pressure compensation (in drip irrigation)

A technology that maintains a constant water flow rate from each emitter regardless of pressure fluctuations or elevation changes across the field.

Storage and economics

Production profitability

A key economic indicator that measures the efficiency of agricultural production by comparing the net profit earned against the total costs incurred during the...

Breeding and seed production

Progeny testing nursery

A specialized breeding nursery where the performance of individual plant lineages is evaluated to determine their genetic potential and suitability for further...

Weather and climate

Radiation balance

Radiation balance is the difference between the total solar radiation absorbed by the earth's surface and the effective outgoing radiation emitted by it.

Weather and climate

Relative humidity

It is the ratio of the actual amount of water vapor in the air to the maximum amount the air could hold at a specific temperature, expressed as a percentage.

Growth and development

Remontancy

The ability of plants to produce multiple crops or bloom continuously throughout a single growing season.

Digital farming

Remote field monitoring

A set of technologies involving satellite imagery, aerial photography, or drones to observe and analyze crop conditions and field development remotely.

Digital farming

Remote Sensing of the Earth

This is a method of gathering information about crops and soil conditions using satellites, drones, or aircraft without direct physical contact with the field.

Breeding and seed production

Reproduction

This is a successive generation of seeds or planting material obtained during the process of seed production from initial plant forms.

Breeding and seed production

Reproduction sowing

A method of sowing elite or high-generation seeds to produce quality seed material for future cycles while preserving the variety's specific traits.

Growth and development

Reproductive phase

The developmental stage of a plant during which reproductive organs are formed, leading to flowering, pollination, and seed or fruit development.

Sowing and varieties

Reseeding (gap filling)

An agronomic practice of sowing additional seeds in areas with thin or failed emergence to achieve the optimal plant population density.

Crop protection

Residual activity period

The duration of time during which a pesticide remains biologically active to protect crops against target pests or diseases.

Crop protection

Residual effect

The impact of fertilizers or pesticides applied in previous seasons on the current crop growth and soil characteristics.

Storage and economics

Residual moisture

The amount of water remaining in soil or agricultural produce after natural drying, evaporation, or drainage processes have occurred.

Growth and development

Respiration rate

Respiration rate is the speed at which a plant or harvested produce consumes oxygen and releases carbon dioxide through metabolic processes.

Crop protection

Retardant

Retardants are plant growth regulators that inhibit stem elongation, helping to produce shorter, thicker, and stronger stems to prevent lodging.

Breeding and seed production

Roguing

The practice of identifying and removing off-type plants, diseased individuals, or weeds from a crop to maintain genetic purity.

Nutrition and fertilizers

Root exudates

These are organic compounds released by plant roots into the soil, creating a nutrient-rich environment for beneficial soil microorganisms.

Nutrition and fertilizers

Root feeding

This is a method of applying fertilizers directly into the soil within the reach of a plant's root system.

Nutrition and fertilizers

Root nutrition

Root nutrition is the process by which plants absorb water and essential mineral nutrients from the soil through their root system.

Growth and development

Root pressure

The active force generated by plant roots that pushes water and dissolved minerals upward through the xylem vessels, ensuring nutrient transport independently o...

Nutrition and fertilizers

Root system

The entire network of roots belonging to a single plant, responsible for anchoring the plant in the soil and absorbing water and essential nutrients.

Machinery and irrigation

Row spacing

The distance between adjacent rows of plants in a field or crop plantation.

Sowing and varieties

Row spacing

The distance between adjacent rows of plants during sowing or planting, measured between the center lines of the rows.

Machinery and irrigation

RTK Base Station

A terrestrial receiver that transmits corrections to agricultural machinery to enable centimeter-level accuracy for satellite navigation systems.

Digital farming

RTK signal

RTK (Real Time Kinematic) is a satellite navigation technique that enhances the precision of position data, enabling agricultural equipment to operate with cent...