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A second internet search from Colorado State University revealed the conversion between <br />ECcds /m and ECsP(mmho /cm). The conversion is a 1:1. See below: <br />(hftp://www.ext.colostate.edu/PUBS/crops/00606.htmi) <br />/.qlt Tolerance of Plants Page 1 of 2 <br />Agriculture and Rural Development <br />F <br />et agS&> Aguod= and Rural <br />Salt Tolerance of Plants <br />nu.,sa.s r. ras <br />Plant species vary in how well they tolerate salt - affected soils. Some plants will tolerate high levels of salinity while others can tektate little or no salinity. The <br />relative growth of plants in the presence of salinity is tanned their salt tolerance. <br />Salt tolerances are usually given in tercets of the stage of plant growth over a range of electrical conductivity (EC) levels. Electrical conductivity is the ability of a <br />solution to transmit an electrical current To determine soil salinity EC, an electrical current is imposed in a glass cell using two electrodes in a soil extract solution <br />taken frmn the soil bang measured (soil salinity). The units are usually given in deciSietnem per metre (Mm). <br />Table 1 categorizes salinity into general ranges from non- saline to very saline. These values are used for plum selectieu for saline soils. Salinity levels vary <br />widely arrow a saline aeep. Salinity also varies from sprung to fall. Salinity usually appears on the soil surface just after spring thaw. <br />A high salt level interferes with the germination of new seeds. Salinity acts like drought on plants, preventing roots from perArming their osmotic activity where <br />water and nutrients cove from an area of low concentration into on area of high coricattratior . Therefore, because of the salt levels in the sail, water and nutrients <br />cannot move into the plant roots. <br />As soil salinity levels increase, the suers on germinating seedlings also increases. Perennial plants seem to handle salinity better than anmtal phutts. In sonic cases, <br />salinity also his a toxic effect on plants because of the high concentration of certain salts in the soil. Salinity prevents the plants from taking up the proper balance of <br />nutrients they require for healthy growth <br />Farms We research an salt tolerance for prairie conditions was done in 1988 (Table 2). It should be noted that crop tolerances developed for chlorido-dominated <br />soils, each as those in California, my not be applicable to crops grown on the salphatc- dominated soils typically found in western Canada. <br />able 1. Salinity rathatt and electricat conductivity value <br />Sell Depth <br />Non - Saline <br />Weekly <br />Saline <br />Mod <br />Saline <br />Strongly <br />Saline <br />Very Struagly <br />Saline <br />'0-60 an 0-2 ft <br /><2 ds/m- <br />2-4 ds/m <br />4 -8 dshn <br />8 -16 ds/m <br />>16 ds/m <br />60 -120 2-4 li <br /><4 ds/m <br />4-8 ds/m <br />8 -16 ds/m <br />16-24 dshn <br />>24 dshn <br />Awm - 'decisiatrns per metre. <br />The dominant salts in prairie saline seeps are calcium (Ca), magnesnun (Mg). sodium (No) cations and sulfate (SO4) anions. If W& levels are high or not balanced <br />with the Ca and Mg, soul tilth can also be effected. The positively charged Na cations attach to the negatively charged clay particles in the soil, cousin the soil to be <br />sticky when wet. and hard and impameable when dry. <br />Table 2 gives salinity tolerance ratings for a range of plant species and a range of salinity levels. New research underway may modify the rating of some plant types. <br />As a genaal rule, plants that have low drought tolerance will have low salinity tolerance. <br />able 2. Salt tolerancce of varh ms types of plants <br />Salt Tolerance <br />Field Crops <br />Forages <br />vegetables <br />Trees, Sim" <br />EC (dshn) <br />icardiess wildrye , <br />Very high <br />hlks altai grass <br />0 <br />evonns slksligtass <br />dkid sucaum <br />High <br />kochis <br />d1ai wildrye <br />Siberian salt tree <br />1.6 <br />ugar beets <br />k1l whestgrass <br />buckthorn <br />ussian wildrye <br />'Iver buffaloberry <br />lender wheat grass <br />-row barley <br />drdsfbot trefoil <br />garden beets <br />whom <br />fflower <br />weetclover <br />asparagus <br />n olive <br />nflower <br />Milk <br />aim <br />-row barley <br />iberian clm <br />I rye <br />illosa lilac <br />inter wheat <br />urd leaf willow <br />rim wheat <br />Moderate <br />11 <br />red whestgtass <br />ing juniper <br />allow mustard <br />tamedute wheatgntes <br />far <br />fescue <br />canary grass <br />bbago <br />a pine <br />x <br />ppfe <br />h4: / / www l . agric. gov. ab. ca/$ dcpartment /dcptdoes.nsf/all/agdox3303 <br />10/23/2008 <br />Revised PR 06 June 10 Attachment 2.05.4(2)(d) -2 -3 <br />