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<br />r, /",. q <br />40J oJ._ <br />~1 E T R 0 l' 0 LIT A N W ATE R D 1 S T R 1 C T <br /> <br />I <br /> <br />38 <br /> <br />, started 'early in 1942 to determine the effect of the three kinds of <br />water upon tree yieldS and soil conditions. Four crops of oranges <br />have been harvested ~ince the beginning of the differential irriga- <br />tion treatment and t9 date the yields have been comparable for <br />all three sections of the grove, The rate of moistnre penetration <br />toward the end of the irrigation season is reduced more for the <br />soil irrigated with softened Colorado River water than for the soil <br />irrigated with the other waters, but the fall application of organic <br />matter and the winter rains continue to restore the soil to its <br />original state with respect to moisture movement. Observations <br />of plant and soil conditions will be continued. <br />Special ,.uggestions were offered to answer individual problems <br />of commercial and ptivate growers of plants in 27 personal inter- <br />views, In connection with these "peeial problems of growers and <br />for the interpretation of the results of controlled experiments in <br />the field and greenhouse, 245 samples of soil and plant tissue were <br />analyzed. <br /> <br />Quality of C%/'ado Rive/' '/Vater <br /> <br />An average analysis of Colorado River water as received at and <br />delivered from the softening and filtration plant during the fiscal <br />year 1945-46 is given in table 6, The continued drop in the sulfate <br />content and total hardne" of the natural water is a favorable <br />trend. The quality of the natural water by months is given in <br />table 7 and the Quality of the softened waler by months in table 8. <br />Data on the operation of the zeolite softeners are given in table 9. <br />The effect of the lower zeolite etJiciency is indicated by the increase <br />in the quantity of salt required per part of hardness removed, the <br />average for 1945-46 being 12 per cent higher lhan for 1944-45, <br />During the year the chemical control of the quality of water <br />maintained throughout the softening process required the partial <br />analysis of approximately 11,000 samples taken at various slages <br />in the process. In addition 1456 water samples were taken at <br />the plant for bacteriological examination. From points in the dis- <br />tribution system 1127 samples were taken for chemical analysis <br />and 2902 samples were collected for sanitary control. In the course <br />of the observation and conlrol of plankton growths in the various <br />District reservoirs 1237 samples were examined microscopically. <br />The practice was continued of ~vot-trf:atii1g \-vith copper sulfate <br />any point in a reservoir where organisms appeared in significant <br />numbers, with the result t.hat widespread and serious distribution <br /> <br />I <br />I <br /> <br />~ <br />