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<br />ClDJECTlUE 3 ... <br /> <br />ObjeClir(! 3 is [() detamine the amounts oj <br />mineral H/c(lrlzerinf], salt precipitation, und .',alt <br />retllrn in drainage \Valers on soils and with walers <br />oj'the Grund Valin' <br /> <br /> <br />E~6Z0() <br /> <br />The simple concept of salt balance needs to be modified for salt <br />sources and sinks. Recent data and theoretical development have <br />yielded models that predict the amount of mineral weathering and <br />salt precipitation as a function of mineralogy and water quality. <br />These models need to be verified under field conditions in the <br />Grand Valley. At prevailing leaching fractions, precipitation is <br />likely to be dominant. Also, drainage water composition is <br />expected to shift to a higher sodium absorption ratio (SARI. <br /> <br />UniQUE EQUll'mEnT <br /> <br />tlnc InST~UmEnTtlTIQn <br /> <br />InSTtlLLED In THE FIELD <br /> <br />Vacuum extractors <br />are used to measure <br />the movement of <br />water, salts, and <br />ferti!;zers below the <br />root zone under <br />unsa tura ted <br />conditions in <br />un dis turbed soil <br />profiles. <br /> <br /> <br />Neutron depth gage <br />assesses changes in soil <br />water content. <br />