International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
11
Chi-squared statistic
A statistic distributed as chi-squared (c²), namely the sum of squares of independent standard normal variables, widely used to test agreement between observation and hypothesis......
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114
Root mean square
The square root of the arithmetic mean of the squares of each observation and is given by
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129
Mean square
In general, the mean square of a set of values is the arithmetic mean of the squares of their differences from some given value, namely their second moment about that value......
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148
Chi-squared distribution
If x1, x2, ... xv are a sample of v independent normally distributed random variables, each with zero mean and unit variance, the random variable x² = x1² + x2² + ------ + xv² gives the chi-square distribution with v degrees of freedom......
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190
Chi-squared test
The test of significance based upon the chi-squared statistic c2.
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208
Mean square error of estimate
The square root of the arithmetic mean of the squared deviations between the estimates for different samples and the population parameter under estimation......
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243
Least square method
A method of determining the arbitrary constants in the equation of a curve, based upon the principle that the most probable value of a quantity to be deduced from a set of measurements is obtained by making the sum of the squares of the residual (deviations from it) a minimum......
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244
Least square line
A relationship between variates obtained by minimizing the mean-squared vertical deviations from the `regression line` where the regression between the variates is linear......
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269
Least square fit
A straight or curvilinear trend to give the mean of the squared vertical deviations as minimum. See 244.
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472
144 square inches
img:equations//472_476_e.jpg
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473
9 square feet
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474
1210 square yards
img:equations//472_476_e.jpg
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624
Kilograms-force per cm square
img:equations//596_630_e.jpg
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1909
Root cap or Root tip
The cushion of epidermal tissue covering the apex of most roots, serving to protect the active meristematic cells behind it. It enables the roots to penetrate the soil without injury to the growing plant......
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1925
Root tuber
A swollen root containing reserve food material.
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1926
Tap root
A primary root which grows vertically downward giving off small lateral roots in acropetal succession.
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1927
Root hair
A unicellular outgrowth from a superficial cell of a young root, serving for the absorption of water and mineral salts from the soil. Its cavity is continuous with that of the cell from which the root hair springs......
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1938
Root pressure
The force set up by the root which assists water to ascend the root and the stem. It is caused partly by the establishment of an osmotic gradient from the root hair to the pericycle of the roots......
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3594
Four-square lock
Lock built at the level crossing of a canal and a navigable river (Illustrated).
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3779
Square crossing, or Right-angled crossing
Crossing of a bridge when its centre line and abutment faces, posts and piers are at right angles to the flow of the channel......
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4959
Effective rooting depth
Soil depth from which the crop extracts most of the water needed for evapotranspiration (also called design rooting depth)......
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