Contoh Report Text 10: HYDROPONICS
Hydroponics is the term used to describe the several ways in which plants can be raised without soil. These methods, also known generally as soilles gardening include raising plants in containers filled with water or any of other nonsoil mediums – including gravel, sand vermiculite and other more exotic medium, such as crushed rock or bricks, and shards of cinder blocks.
There are several excellent reasons for replacing soil with a sterilize medium. Soil-borne pests and diseases are immediately elimated, as weeds are. And the labour involved is reduced.
More important, raising plants in a nonsoil medium will allow you to grow more plants in limited amount of space. Food crops will mature more rapidly and produce greater yields. Water and fertilizer are conserved, since they can be reused. In addition hydroponics allow you to exert greater control over your plants, to insure more uniform results.
All of this is possible by the relation of a plant with it’s growing medium. It isn’t soil that plants need-it’s the reserves of nutrients and moisture contained in the soil, as well as the support the soil renders the plant. Any growing medium will give adequate support.
The methods of hydroponics gardening developed over the past forty-five years can be divided into categories defined by the medium in which the plant are grown. In water culture, the plants are grow only in water, or in a water and nutrient solution. Sand culture calls for raising, plants in sterile sand, into which a water and nutrient solution is pumped. Aggregate culture replaces the sand, instead of using one of the materials such as gravel or vermiculite, and retaining the method of pumping a water and nutrient solution into the material. Finally, there are number of experimental or unorthodox techniques.
Hydroponics units have been used to replace the conventional benches in a green house, and soil-borne pests and diseases are avoided.