click below
click below
Normal Size Small Size show me how
Horticulture
Horticulture key terms unit 4
| Term | Definition |
|---|---|
| aggregation | the clinging together of soil particles to form larger, crumblike particles |
| biochemical | a chemical formed by a living organism |
| capillary water | water held against the force of gravity |
| dormancy | in a resting or non-growing state |
| field capacity | water left after capillary movement stops |
| gravitational water | water that the soil is unable to hold against the force of gravity |
| loam | soil with approximately equal amounts of sand, silt and clay; generally considered the best type of soil for plant growth |
| limestone | a natural rock used to reduce soil acidity |
| medium | a material that is used to start and grow seeds and plants |
| macroelements | major elements of fertilizer: nitrogen, phosphorous, potassium,- NPK |
| microelements | plant nutrients needed in small quantities |
| perlite | a grey-white material of volcanic orgin used to improve aeration of the media |
| photoperiodism | response of plants to different periods of light and darkness in terms of flowering, reproduction cycle, and dormancy |
| peat moss | partially decomposed vegetation that has been preserved underwater |
| slow-release fertilizers | fertilizer that releases plant nutrients over a long period of time |
| soilless mix | contains combinations of perlite, sphagnum moss, peat moss, vermiculite, limestone, tree bark, and slow -release fertilizers |
| sphagnum moss | dehydrated remains of acid bog plants, used in shredded form for starting seeds |
| transpiration | loss of water through the leaves or stems of plants |
| texture triangle | to determine the textural name of a soil |
| tree bark | bark of pine or hardwood trees ground in small pieces |
| vermiculite | a light mineral with neutral pH used to increase the moisture-holding capacity of media |