Term No. | Term Name/Term Description | Action |
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130 |
Degrees of freedom | The degrees of freedom of a set of observations (ex- hypothesis are subject to sampling variation) is the number of independent values in the sample that could be assigned at will within the specification of the system...... | | Similar Terms |
1653 |
Degree of dispersion | Extent to which soil aggregates are broken down to primary particles by any given treatment. | | Similar Terms |
1665 |
| Similar Terms |
1720 |
| Similar Terms |
1774 |
Degree of saturation (V) | Percentage ratio of exchangeable cations exclusive of H+ (= S ) to total exchangeable cations inclusive of H+ (= T ), i.e. ..... | | Similar Terms |
1802 |
| Similar Terms |
2154 |
| Similar Terms |
3227 |
Durability | 1 - Resistance of lining to weathering, chemical attack and wearing. 2 - See 5637. | | Similar Terms |
3749 |
| Similar Terms |
3756 |
Syphon, Inverted siphon, Irrigation syphon, Canal syphon, Syphon superpassage | 1 - A structure with a closed conduit, designed to run full and usually under pressure, to transport (i) canal water under railroads, roads, various types of drainage channels and depressions, or (ii) drainage water under railroads, roads, etc. In reference to cross-drainage works on canals, this term pinpoints to the condition that the canal passe..... | | Similar Terms |
3842 |
| Similar Terms |
3975 |
Lift irrigation area, or Lift area | Area interspersed between gravity flow areas where the levels are higher than those permitted by gravity flow irrigation from the source, but can be irrigated economically by water lifted by pumps or other water lifting devices to the required level at a certain point in the supply system...... | | Similar Terms |
4010 |
Continuous-flow irrigation | A system of delivery of irrigation water by which each irrigator receives his allotted quantity of water at a continuous rate throughout the growing or irrigation season...... | | Similar Terms |
4032 |
Night-storage irrigation system | In this system practiced in Sudan, crops are not watered by night. The outlet pipes are closed at sunset but water continues to enter the tertiary canal, flow rate being the same as the one recorded during the day. At the downstream reaches of the tertiary canal, a small flat crested brick weir is constructed. A steel pipe is also provided across t..... | | Similar Terms |
4034 |
Intermittent-flow irrigation system | A system, in which each irrigator gets water only intermittently either by pre-established rotation of the basic flow (called module) or on demand i.e. according to the prior demands by individuals or group of individuals of the quantities and at the times that appear to them most desirable, or finally, in the most modern pressurized systems, in to..... | | Similar Terms |
4048 |
Irrigation return flow | That portion of the irrigation water supply which is not infiltrated into the soil, but returns to streams or rivers. Its quality may be impaired by sediment, agricultural chemicals, or change in temperature. ..... | | Similar Terms |
4065 |
Farm irrigation structures | Small structures and equipment that enable an irrigator to divert water from the watercourse and to convey it to various points in his field including control, regulation and measurement devices...... | | Similar Terms |
4595 |
Collective irrigation system | A system meant to make possible the irrigation of several fields or farms of an area. It includes all or a part of the following works: storage, intake, diversion or pumping works, works for bringing water to the fields to be served, and other facilities necessary to operate the system...... | | Similar Terms |
4596 |
Individual irrigation system | A system located downstream of the outlets served by the collective irrigation system and meant to deliver water to the farms or fields of an area...... | | Similar Terms |
4597 |
| Similar Terms |
4598 |
| Similar Terms |
4599 |
| Similar Terms |
4600 |
Systematic irrigation | Water applications repeated at definite intervals of time during the growing season of the crop(s). | | Similar Terms |
4601 |
Flow irrigation, or Gravity irrigation | Method of operating the whole or part of a system using water flow by only gravity, water being available at a sufficient level (or pressure) to ensure its conveyance and distribution in the fields...... | | Similar Terms |
4602 |
Pumping irrigation | Method of operating a system or part of a system using, fully or partly, an artificial pressure for ensuring the conveyance of water, its delivery or distribution in the fields...... | | Similar Terms |