| A | B |
|---|
| The clinging together of soil particles to form larger, crumb-like particles. | Aggregation |
| A chemical formed by a living organism | Biochemical |
| Water held against the force of gravity. | Capillary Water |
| In a resting or nongrowing state. | Dormancy |
| Water left after capillary movement stops. | Field District |
| Water that the soil is unable to hold against the force of gravity. | Gravitational Water |
| Soil with approximately equal amounts of sand, silt and clay; generally considered the best type of soil for plant growth. | Loam |
| Natural rock used to reduce soil acidity | Limestone |
| A material that is used to start and grow seeds and plants | Medium |
| Major elements of fertilizer | Macroelements |
| Plant nutrients needed in small quantities. | Microelements |
| Gray-white material of volcanic origin used to improve aeration of media. | Perlite |
| Response of plants to different period of light and darkness in terms of flowering, reproduction cycle, and dormancy. | Photoperiodism |
| Partially decomposed vegetation that has been preserved underwater. | Peat Moss |
| Fertilizer that releases plant nutrients over a long period of time. | Slow-Release Fertilizers |
| Contains combinations of perlite, sphagnum moss, peat moss, vermiculite, limestone, tree bark, and slow-release fertilizers. | Soilless Mix |
| Dehydrated remains of acid bog plants, used in shredded form for starting seeds. | Sphagnum Moss |
| Loss of water through the leaves or stems of plants. | Transpiration |
| Used to determine the textural name of a soil. | Texture Triangle |
| Bark of pine or hardwood trees ground in small pieces. | Tree Bark |
| Material expanded by heating that increases the water holding capacity. | Vermiculite |
| The toxic effect of one plant on another. | Allelopathy |
| A form of regulating growth in plants in which the terminal bud secretes chemicals that inhibit or prevent the growth of lateral buds on the same shoot. | Apical Dominance |
| Plant hormones that accelerate growth by stimulation cell enlargement. | Auxins |
| Plant hormones that stimulate cell division and work along with auxins (will not work without auxins present). | Cytokinins |
| Plant hormones that stimulate growth in a stem and leaf by cell elongation | Gibberellins |
| Plants plowed or mixed into the soil to rot and add organic matter to the soil. | Green Manure |
| Growth-regulating substances in plants. | Hormones |
| Plant hormones that inhibit seed germination, stem elongation, and hasten ripening of fruit (ethylene gas) | Inhibitors |
| Swollen place where leaves and buds are generally attached | Node |
| Plant Growth Retardants | PGR |
| Movement of gases and water vapor from the plant leaf during photosynthesis. | Photorespiration |
| Chemicals that slow down growth. | Retardants |
