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<br />USE OF SALlNE DRAINAGE WATER FOR IRRIGATION
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<br />31
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<br />TABLE 3
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<br />Amounts. (mm) of Colorado and Alamo River waters used for irrigation in the "block" rotation
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<br />Treat. 1982 Cotton 1983 Cotton
<br />mentb
<br /> Colo. R. Alamo R. Total % Alamo R. Colo. R. Alamo R. Total % Alamo R.
<br />C 1306(1~)' 0 1306(19) 0 1177(6) 0 1177(6) 0
<br />cA 515(12) 774(30) 1289(42) 60 617(4) 545(3) 1162(6) 47
<br />A 0 1187(25) 1187(25) 100 0 1149(7) 1149(7) 100
<br /> 1984 Wheat 1984-1985 Alfalfa
<br /> Colo. R. Alamo R. Total Colo. R. Alamo R. Total
<br />C 823(8) 0 823(8) 2048(6) 0 2048(6)
<br />cA 798(2) 0 798(2) 2058(7) 0 2058(7)
<br />A 795(5) 0 795(5) 2029(16) 0 2029(16)
<br /> Complete rotation
<br /> Colo. R. Alamo R. Total % Alamo R.
<br />C 5372(8) 0 5372(8) 0
<br />cA 3995(18) 1332(34) 5327(50) 25
<br />A 2824(17) 2336(30) 5160(42) 45
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<br />-Include8 pre-plant water applications.
<br />bC=Colorado River water used solely for irrigation; Alamo River water used for irrigation in relatively
<br />smaller (Ca) and larger (cA) amounts after seedling establishment with Colorado River water.
<br />cValue in parentheses is standard error of mean.
<br />
<br />no significant yield loss was observed from growing cantaloupes using Colo-
<br />rado River for irrigation in the land previously salinized from the irrigation of
<br />wheat and sugarbeets with drainage water. There was no loss in the yields of
<br />the crops groWn in the "block" rotation. from substituting drainage water for
<br />Colorado River water for the irrigation of the two cotton crops after seedling
<br />establishment. In the first cotton crop (1982), lint yield was not reduced even
<br />when saline water was used for all irrigations, including the preplantand seed-
<br />ling establishnient periods (treatment A). There wa~'no significant loss in lint
<br />yield in the second cotton crop (1983) from use of drainage water for the irri-
<br />gations given following seedling establishment which was accomplished using
<br />Colorado River water (the recommended strategy treatment, cA), although
<br />yield was lower this year. There was a significant and substantial loss of lint
<br />yield, as expected, where the drainage water was used solely for irrigation
<br />(treatment A). This yield reduction was caused primarily by a loss of stand
<br />that occurred this second year because salinity was excessively high in the
<br />seedbed during the establishment period. No loss in yield of wheat grain or
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