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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
177Z – DistributionThe distribution of a logarithmic transformation of a variance ratio. If there are two independent estimates of the population variance S12 and S22 ba.....
4452ZawafaAn Egyptian water lifting device used for lifts exceeding two metres. It is a modern version of the chain and bucket type of Persian wheel but its des.....
401Zeptoimg:equations//383_402_e.jpg.....
2667Zero air voids unit weightThe weight of solids per unit volume of a saturated soil mass......
708Zero moisture indexThe index of moisture when the precipitation analysed month by month is just adequate to supply all water needed for maximum evaporation and transpira.....
5000Zero tillageA system whereby crops are planted into the soil without primary tillage beforehand. .....
7621Zero tolerance A policy that prevents an agricultural commodity from being shipped or sold if it contains detectable levels of any chemical that has been shown to be.....
8335Zero-wait stateA condition that results when no delays are inserted into the system software to deliberately detain operation of the CPU. This can be done with high-.....
1897Zerophytes, or XerophytesPlants which can subsist with a small amount of moisture, as a desert plant or plant under conditions where excess of salts makes it difficult to take.....
384Zettaimg:equations//383_402_e.jpg.....
5180Zigzag drainage systemSystem in which field drains as well as mains are constructed zigzag to reduce high velocities. It is probable that this system is used in mechanized .....
4817Zigzag nozzle-linea single nozzle-line skirting round each tree in a row in an orachard, sometime to the right, sometime to the left......
2522ZoneA vertical portion usually of a masonry dam between two horizontal lines of its cross section adopted for stress analysis. .....
2490Zone groutingA process of providing a grout curtain whereby a whole section of the curtain is stage drilled and grouted to a limited depth before any holes are dri.....
979Zone of aeration, Aeration zone, Zone of suspended water, or Unsaturated zoneThat portion of the lithosphere in which the functional interstices of permeable rock or earth are not (except temporarily) filled with water under hy.....
1143Zone of fluctuation of water table, or zone of phreatic fluctuationsThe zone through which the water table fluctuates from its highest to its lowest level within the formation, in response to the discharge and recharge.....
1148Zone of permanent non saturationThe strata above the highest water level reached in an aquifer when the groundwater table moves up and down in response to seasonal and shorter term w.....
1149Zone of permanent saturationThe saturated portion of an aquifer that lies below the lowest water level reached when the  groundwater table moves up and down in response to season.....
978Zone of rock fractureThe upper part of the lithosphere, in which rocks are under stresses less than those required to close their interstices by deformation of the walls o.....
982Zone of rock-flowage-and-fractureThat part of the earth crust lying between the zone of the rock fracture and the zone of rock flowage. In it, the strongest rocks behave as in the zon.....
981Zone of saturationThat part of the earth crust where the functional interstices of permeable rock or earth are completely filled with water under positive hydrostatic p.....
980Zone of weatheringThe outer layer of the earth crust of the earth, including the exposed surface and that part which, as a result of porosity, cracking, and jointing, i.....
6702Zoogeography The study of the geographical distribution of animals......
6916ZoologyThe study of all aspects of animal life......
8336ZoomThe process of proportionately enlarging or reducing an image displayed on a computer monitor......
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