Ecological Cycles, Soil Nutrients, and Soil Conservation

Vocabulary flashcards covering cellular energetics, the nitrogen and carbon cycles, soil nutrient stewardship (4Rs), and soil conservation and erosion management practices.

Sustainability

Meeting the needs of the present without compromising the ability of future generations to meet their own needs.

Sustainability Barrel

A visual tool used to demonstrate the importance of economic, environmental, and social factors such as profits, jobs, and income.

Chloroplast

The plant cell organelle that carries out photosynthesis, taking in water and carbon dioxide with energy to produce energy-rich glucose and oxygen.

Mitochondrion

The organelle in plant and animal cells where cellular respiration occurs, breaking down glucose to release $ATP$, heat, water, and carbon dioxide.

Photosynthesis

The biological process in plants represented by the formula $\text{light} + H_2O + CO_2 \rightarrow O_2 + C_6H_{12}O_6$, which removes carbon dioxide from the atmosphere.

Cellular Respiration

A cellular process utilized by living organisms (plants and animals) that consumes glucose and oxygen to produce energy ($ATP$), releasing carbon dioxide and water into the atmosphere.

Nitrogen Fixation

The process that converts atmospheric nitrogen ($N_2$) into ammonia ($NH_3$).

Nitrification

The conversion of ammonia ($NH_3$) into nitrate ($NO_3^-$) so that it can be absorbed and used by plants.

Denitrifying Bacteria

Soil microorganisms that convert fixed nitrogen compounds back into atmospheric nitrogen gas ($N_2$).

Organic Fertilizers

Fertilizers derived from natural sources such as manure and organic matter that nourish living organisms in the soil to recycle nitrogen.

Chemical Fertilizers

Highly concentrated mineral formulations containing nitrogen, phosphorus, and potassium ($K$) extracted from mineral deposits.

Eutrophication

An ecological imbalance occurring when excess natural or artificial nitrogen and phosphorus trigger excessive phytoplankton growth in water, depleting dissolved oxygen, decreasing species diversity, and blocking sunlight from submerged plants.

Carbon Sinks and Reservoirs

Storage locations for carbon throughout the carbon cycle, including $CO_2$ in the atmosphere, dissolved in water, in producers, consumers, decomposers, dead remains, fossil fuels, and sedimentary rock.

Nitrogen ($N$)

An essential plant nutrient that supports vegetative leaf growth and is required for photosynthesis.

Phosphorus ($P$)

An essential plant nutrient that helps trap solar heat for photosynthesis, supports dark green foliage, aids flower, fruit, and seed production, and establishes strong roots.

Potassium ($K$)

An essential plant nutrient that strengthens plant cell walls, facilitates internal water movement, promotes vigorous growth, and defends against diseases, pests, and harsh weather conditions.

4R Nutrient Stewardship

A management framework guiding farmers to apply fertilizers using the Right Source, Right Rate, Right Time, and Right Place.

Right Source

The 4R principle of matching the specific nutrient fertilizer type to the biological requirements of the target crop.

Right Rate

The 4R principle of applying the exact quantity of nutrients required for crop growth, avoiding both deficiencies and over-application.

Right Time

The 4R principle of delivering nutrients when crops need them most, specifically when the crop begins growing and post-harvest to replenish the soil.

Right Place

The 4R principle of positioning fertilizer where crop roots can access it efficiently to maximize plant uptake and minimize environmental losses.

Topsoil

The uppermost surface layer of soil, rich in organic matter and essential nutrients required for plant development.

Soil Erosion

The wearing and breaking away of topsoil driven by natural forces such as wind and water, as well as human activities like deforestation and overgrazing.

Desertification

The degradation of land where fertile soil is severely eroded and transformed into unusable, desert-like conditions.

Contour Plowing

The practice of plowing along the natural contours of the land to reduce water runoff and soil erosion, though challenging to maneuver with farm machinery.

Terracing

A farming technique that builds broad, flat steps into steep slopes to reduce erosion and encourage gradual water infiltration, though expensive and labor-intensive to maintain.

No-Till Farming

A conservation agricultural method where crops are planted without disturbing the soil, improving soil structure and moisture retention, though often requiring herbicides to control weeds and presenting pest challenges.

Crop Rotation

The agricultural practice of alternating the species of crops planted in a field each season to balance soil nutrients and disrupt pest life cycles, though requiring diverse equipment and management.

Cover Crops

Plants cultivated during off-seasons to safeguard soil health, prevent erosion, and retain nutrients, requiring additional labor, time, and financial investment.