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<br />of onion bulbs to salinity in the marine climate of Torrey Pines and the desert <br />~ climate of Indio in California. <br />Cl) <br />....:l This author agrees with Young's (1973). statement that "salt tolerance <br />~ studies should be carried out within an ecologically discrete area in order <br />to have the greatest validity." Salt tolerance of several crops is being <br />tested in the Imperial Valley at this time. <br />Wakhab (1961) studies the germination of maize, barley, gram, rice, a~d <br />cotton at O. I, 0.2. 0.3. and 0.4% Nacl placed on loam and sandy loam at vary- <br />ing percentages of the moisture holding capacity. Maize showed 100% germina- <br />tion up to 0.3% NaCl and 75% moisture capacity (MC), barley at 0.4% NaCI and <br />6~~ (MC), rice 0.3% NaCI and 75% (MC), cotton - 6 varieties at 0.2% NaCI and <br />3 varieties at 0.1% NaCI and 6~~ (MC). <br />Kneeb (1959) collected soil samples from plots to grow plants in a <br />sequence of increasing salinities. Barley and corn gave 10~~ germination <br />at 1.6% salt when moistened to field capacity on petri dishes, wheat produced <br />10~~ germination at O.~~ salt. In the field 1.5% was the upper limit for <br />germination of corn and barley, and the wheat about 0.85%. This far exceeds <br />the values of the projected Colorado River water. Oashevskii (1957) in agree- <br />ment with Bernstein and Hayward (1958) found that higher levels of soil <br />moisture would permit sugar beets to germinate at higher salt levels. SU9ar <br />beets could tolerate 0.014% Cl at 14% moisture, but 0.044% at 22% moisture. <br />Lopez (1968) utilized water containing 150 meq/l NaCI solutions to <br />produce lower concentrations by dilution. He found a reduction of 71 to 5~~ <br />at 3.31 mmho/cm and 5.65 mmho/cm in the germination od durum wheat. Common <br />wheat showed a germination of 87.1 at 5.65 mmho and 55.2 at 12.10 mmho. <br />Barley showed 73.1% germ at 16.4 mmho/cm and none at 32 mmho. Tomatoes <br />showed varietal differences of 52% and 64.~~ germ at 6.58 mmho/c~. He <br />placed durum wheat, alfalfa, tomato. broccoli, and endive in the little <br />tolerance group requiring water of less than 4 mmho. Moderate tolerance <br />groups included vetch. some tomato varieties, lettuce, and common wheat <br />with tolerance of 4-12 mmho during germination. Barley was capable of <br />germination between 12-18 mmho. <br />It has been demonstrated that sprinkler irrigation is effective in remov- <br />ing salinity from the soil surface and enhance emergence of lettuce, cabbage, <br />carrots, onions, sugar beets, alfalfa, radishes, cauliflower, broccoli, saf- <br />flower, flax, cantaloupes, and watermelons in Imperial Valley, Robinson, at al. <br />(1966) (1967abc) (1968abc) (1969) (1970) (1972). In an on-going experiment <br /> <br />. <br /> <br />12 <br /> <br />h-~ <br />