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<br />o <br />r.--:} <br />.... <br />W <br />W <br />~ <br /> <br />Figure 1. <br /> <br />Suitability of Irrigation Water <br />D6 Affected by <br />Sodium and Total Mineral Content <br /> <br />Total Concentration as Electrical Conductivity (Micromhos) <br /> <br />~ 60 <br />;fl <br />bJ <br />+' 50 <br />s:: <br />Il <br />tl <br />J.< <br />~ 40 <br /> <br />500 1,000 1,500 2,000 2,500 3,000 3,500 <br /> <br />o <br />100 <br /> <br />90 <br /> <br /> <br />80 <br /> <br />70 <br /> <br />Permissible <br />to <br />Doubtful <br /> <br /> <br />30 <br />20 <br />10 Excell- <br /> ent to <br /> good <br />0 <br />0 5 <br /> <br />Doubtful <br />to <br />unsuitable <br /> <br />Un- <br />suit- <br />able <br /> <br />Good <br />to <br />permissible <br /> <br /> <br />25 <br /> <br />30 <br /> <br />35 <br /> <br />15 <br /> <br />20 <br /> <br />10 <br /> <br />Total Concentration in Equivalents Per Million <br />(Approximate mineral content in parts per million may be <br />determined by multiplying the conductivity by six-tenths) <br /> <br />From TECHNICAL BULLEI'IN 962, U. S. D~. OF AGRICULTURE, p. 26. <br /> <br />5-28 <br />