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<br /><:;) <br />(~) <br />~ <br />foX) <br />'-.1 <br />U1 <br /> <br />Into the profile and out the arain tile. An estimate of this cost could be <br />obtained f,'om the rental charges. Forty acres with pump, an 8-inch main line, <br />and 3-inch sprinkler line and head is about 160 for three months or $240 all <br />year. Labor and fuel would average $35 per acre. If he utilized the system <br />six tlmo5 in three months, all costs would run around $62/acre. Utilizing <br />the system throughout the year would reduce the cost to around $45/acre. <br />Tho steady decline in acreage ponded for leaching indicates the reduction <br />in leacrdng by this method: In 1967, 9157 acres; 1968, 7851 acres; in 1969, <br />8560 acres; 1970, 1685 acres; 1971 1777 acres; 1972, 1202 acres; 1973, 973 <br />acres. On the established cultural areas It is now more common to Include a <br />pre-irrigation of four to six inches by sprinkler, flood, or furrow to leach <br />salts ahead of planting. The forming of borders for long-term ponding is <br />utilized only in particularly poorly drained areas, and even some of these <br />areas are being sprinkled as by Jenkins noted above. <br />DISCUSSION <br />The general criticism of Young et al. (1973) that the Bernstein (1964) <br />work was conducted with Cl salts, whereas, the Colorado River contains a sub- <br />stantial quantity of SD4- could be st8ted generally for most studies In the <br />world, I',",val'skaia (1958), Kreeb (1959), Dashevskll (1957), OS8wa (1957), <br />Ogo and Nishikawa (1959), Iwake (1958), Shlmose (1957), Desai et al. (1957), <br />T. Sing et al. (1956), Cavazza (1968), Lopez (1968), Gllbot (1954), Wahkab (1961), <br />= <br />Simonnei.J1J (1945), The Russian school Is aware of the Influence of S04 and <br />separates their soil classification Into Cl- and S04= predominant classes. <br />Generally, however, the Russians have ignored the influence of soil texture <br />Ilmltinq the utility of their work in this study. Furthermore, their methods <br />of extraction of soil salts brings solid sulfates Into solution. Kovda (1946) <br />concede3 this point and further points out that the discrepancy would be <br />stronger in the less saline soils. <br />In view of the facts that data from other countries would have to be <br />corrected for sulfate waters also, that there was close similarity between <br />all classifications of plant tolerance to soil salinity, and that the degree <br />of completion of the work on the crop spectrum was greater at the U. S. <br />Salinity tab, it was concluded that this data would be the most productive <br />starting point. <br />Within the State of California a committee of consultants (1974) has <br />modifier! Bernstein's work to set up a series of declination values. Bernstein' <br />(1962) suggests that plants growing on soil containing gypsum salts can tolerate <br /> <br />16 <br />