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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
2891Needle1 - A plank, usually made of timbers or steel or precast concrete, set on end to close an opening for the control of water. In dams or control structu.....
5931Needle1 - A piece of timber or steel forming an abutment for the end of raking shores. 2 - A timber or steel beam laid horizontally at right angle to the wa.....
2975Needle valveA blender, pointed rod fitting in a hole or circular or a conrroidal seat. The flow is controlled through the outlet, reducing the area of the outlet .....
2276Needle weirA movable weir where the headwater level is manipulated with the help of `needles` (See 2891)......
1035Negative confining bedA formation that prevents or retards downward movement of groundwater where the overlying water has sufficient head to produce a resultant downward pr.....
8227Negative logicThis term refers to logic in which the negative voltage represents the “1” state and the zero voltage represents the “0” state......
3171Negative surgeA negative surge results from a sudden change in flow that decreases the flow depth. It is a retreating wave front moving upstream or downstream......
7620Negligible residue Any amount of a pesticide chemical(s) remaining in or on a raw agricultural commodity that would result in a daily intake regarded as toxicologically .....
9030Negotiated contractContract awarded to a selected tenderer or bidder after a study of the qualifications, previous experience and facilities of one or more tenderers......
6921NektonSwimming animals of the pelagic zone; larger than plankton......
6752Neotropical Zoogeographical region that includes South America, Central America and the West Indies; Neogea......
1302Nertic zoneThe zone of shallow water adjoining a coastline considered to extend from the low tide mark to a depth of 100 fathoms (182.9 m); the sea over the cont.....
6945NestenyThe occurrence of larval or other juvenile characters in the adult stage of an organism or the presence of an adult character in the larval stage......
8228NestingEmbedding commands or data in levels of other data so that specific routines or instructions can be executed or accessed continuously in loops, withou.....
9182Net appreciation on livestockThe amount by which the value of the livestock in hand at the end of the year plus the amount received for livestock sold exceeded the livestock in ha.....
1956Net assimilation rateThe rate of increase in dry matter per unit area of leaf surface......
9338Net Biome Production (NBP)Net gain or loss of carbon from a region. NBP is equal to Net Ecosystem Production minus the carbon lost due to a disturbance (e.g., a forest fire or .....
9183Net depreciation on livestockThe amount by which the value of livestock in hand at the beginning of the year, plus the amount paid for livestock purchased exceeded the value of li.....
4886Net duty, or Farm dutyDuty of water reckoned or measured at the farm......
9339Net Ecosystem Production (NEP)Net gain or loss of carbon from an ecosystem. NEP is equal to Net Primary Production minus the carbon lost through heterotrophic respiration......
9190Net farm profit, or Net farm incomeFarm profit less charges, either amortization or water charges or both......
3936Net head, or Effective head1 - For open-flume turbine, it is the difference in elevation between (i) the headwater in the flume at a section immediately in advance of the turbin.....
4876Net irrigation requirement, Farm delivery requirement, or Delta at farmIrrigation requirement at the point of water delivery to an irrigated farm; equal to consumptive use plus percolation minus effective precipitation, o.....
4976Net longwave radiationBalance between all outgoing and incoming longwave radiation......
9217Net present valueValue of benefits minus the value of costs, capital and maintenance......
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