Laserfiche WebLink
<br />,~ <br />'<::" <br />(') <br />C,I <br /> <br />. <br /> <br />. <br /> <br />, . <br />-' <br /> <br />PART 2 <br /> <br />SOIL SALINITY MEASUREMENTS <br /> <br />OBJECT! VES <br /> <br />To monitor salinity within the soi <br />of deep percolation. <br /> <br />prof i I e as re I ated to the percent <br /> <br />ACCOMPLI SHMENTS <br /> <br />During 1989, the soi I staff made quantitative salt determinations at <br />depths of 6,18, and 30 inches for 37 monitoring stations. These <br />include the 20 monitored sites established in 1989. <br /> <br />OBSERVATIONS <br /> <br />Sal inity levels are relatively low in the sol Is at all the monitoring <br />sites <Table 9. Sal indy in mmhos per cm). The present sal inity <br />levels in the soi I at those sites have I ittle, if any effect, on crops <br />commonly grown in the Grand Valley <Table 10. Crop Tolerance Table). <br />Some deep percolation is required to keep salinity at a level below <br />the root zone. The amount of deep percolation to keep salinity below <br />the root zone is dependent on the soi I type and the landscape on which <br />so i J 5 occur. <br /> <br />Monitoring sites 11, 12, 13, 14, and 17 have been monitored for a <br />period of 6 years. Salinity levels have changed very little during <br />this 6 year.period. Salinity levels in these soils are approximately <br />the same in 1989 as they were in 1984. On site 17, if the data from <br />1984 is thrown out, this site may be showing a slight increase In <br />salinity level. <br /> <br />Monitoring sites 15, 16, and 21 have been monitored for a period of 5 <br />years. Salinity levels on these sites have not changed appreciably <br />during the period 1985 through 1989. <br /> <br />Monitoring sites 26 and 27 have been monitored for 4 years. <br />been little change in salinity levels on these sites. <br /> <br />There has <br /> <br />Monitoring sites 28, 29, 30, 31, 32, 33, 35, 36 and 18 have been <br />monitored for a period of 3 years. Salinity levels have changed very <br />little during this 3 year period. On site 28, salinity levels may be <br />on the Increase. Th i s may be in part to the fact that the so i I <br />samples are being taken from an area outside of the spray pattern of <br />the microJets. <br /> <br />25 <br />