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<br />-, '-;-"",",,~~~'f;'''''~~'}~~ <br /> <br />SOIL ANALYSES <br /> <br />Soluble Salt Content -(Plots l-96) <br /> <br />The results of analJ"ses of soU samples from selected plots in the <br />drained and subbed areas are shown in Table VI on page l6. The <br />analJ"ses of soU samples, taken in October, 1955 after the barley crop <br />was removed, show that the excessive soluble salts have been removed <br />through a depth of 33 inches. In all samples decreases in soluble salts <br />were found from the 1954 salt contents except in the l8 to 33-inch depth <br />where small increases were found in a few plots which had received the <br />low rate of surface irrigation. The reclamation treatments have thils <br />effectivelJ" reduced the soluble salts to a level at which there is no <br />injury to crops. <br /> <br />Exchangeable Sodium Content - (Plots 1-96) <br /> <br />The 1955 analyses also show that the soUs from these selected <br />plots are non-alkali through a depth of l8 inches. The 1955 exchangeable <br />sodium contents (see Table VII, page l7) of the surface soils decreased <br />from those found in 1954. Some increases in the exchangeable sodium <br />contents were found in the lower depths particularly on those plots <br />which had received the low rate of surface irrigation water. Since <br />excessive exChangeable sodium in soUs causes an 1lIJi'avorable physical <br />condition and high alkalinity, one of. the main obJectives of reclama- <br />tion 18 to remove the sodium from the soil. <br /> <br />r ~ '" _. . ,- <br />.,,' . <br /><,J'.... ...,-,,,,,,_,,j <br /> <br />ij;, <br /> <br />-l5- <br /> <br />