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<br />, <br /> <br />, <br /> <br />. 'Effect of Limited Irrig!on <br />on Yield of Sugar Beets ' <br />Page 4 <br /> <br />. <br /> <br />and retarded leaf growth. The plants, however, did not exhibit the anticipated <br />wH't'much before three in the afternoon. Recovery was fast after sundown. <br /> <br />.T h~ls~cond irrigation was applied September 4 when lower leaf loss was exhibited. <br />tHe ruh'time and amount of water applied were longer for the heavy stress <br />section because the soil absorbed the water faster and longer, requiring a <br />longer time to complete each run. The average water application per irrigation <br />was 4.76'acre inches with 5.13 acre inches on Rep 1 and 4.27 acre inches on <br />Rep 4. Total time of irrigation was 26 hours 15 minutes. Total water <br />applied was 9.51 inches. <br /> <br />The dryland section of the test-demonstration received no supplemental <br />irrigation water and no rainfall run-off from adjacent areas. <br /> <br />VI ELD RESULTS <br /> <br />A comparison of yield data based on the rate of water supplementation is <br />found in Table II. The greatest yield was found in the unthinned beets grown <br />under full irrigation. Thinning did reduce both yield of beets and sugar <br />as illustrated in Figures 3 and 4. <br /> <br />In the moderate stress section, beet yields were from 8.7% to 14.4% less <br />than those produced under full irrigation. Sugar yields were also reduced <br />from 10.7% to 14.5% depending upon the treatment. <br /> <br />TABLE I I SUGAR BEET IRRIGATION WATER STRESS TEST-DEMONSTRATION PROJECT <br /> Yields Compared on Basis of Water Treatment <br />Water # Lbs. Tons % Lbs. Beet Size <br />Treatment Stand ~ Beets/A Beets/A Sugar Sugar/A in Oz. <br />Full Irri. Unthinned 5 38,368 19.18 17.3 6,633 28.9 <br />Full 100-110 6 36,804 18.40 16.7 6,149 39.8 <br />Full 67~75 5 36,756 18.38 16.8 6,193 41.4 <br /> AVERAGES 37,309 18.65 16.9 6,325 40.3 <br />Mod. Stress Unthinned 4 32,855 16.43 17.2 5,668 27.9 <br />Mod. 1 OQ- 11 0 6 31,767 15.88 16.,8 5,344 33.1 <br />Mod. 67~75 5 33,569 16.78 16.5 5,531 39.5 <br /> AVERAGES 32,730 16.36 16.8 5,514 33.5 <br />Hvy. Stress Unthi nned 5 28,272 14.14 17.2 4,862 24.5 <br />Hvy. lOC-ll 0 6 28,306 14.15 17.0 4,815 32,5 <br />Hv)'. 67~75 4 28,920 14.46 16.8 4,869 35.3 <br /> AVERAGES 28,499 14.25 17.0 4,849 30.8 <br /> 'I <br />Dry 1 00- 11 0 4 11,549 5.78 19.1 2,207 23.4 <br />Dry 67-75 4 1 3,364 6.68 18.6 2,485 25.4 <br /> AVERAGES 12,457 6.23 18.9 2,346 24.4 <br />