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<br />Gj <br />...... <br />;''') <br />....... <br /> <br />:-....' <br /> <br />;::.' <br /> <br />Of the five su...face i......igated sites, th...ee of them had deep <br />pe...colation ove... the ave...age of 17.9 inches fo... al I alfalfa sites <br />(Table 7). Site 16 had no deep pe...colation and the amount of wate... <br />app lied was neve... adequate to meet the needs of the p I ants (Refe... to <br />Appendix B fo... individual i......igations). The...e were some visible signs <br />of plant st...ess at the lowe... end of the field du...ing the g...owing <br />season. This site might be meeting some of the cr.op wate... <br />...equi...ements th...ough sub-i......igation because of high wate... table. <br /> <br />Site 31 had the next lowest deep pe...colation of 16.4 inches fo... <br />su...face i......igated sites (Table 7). The p...oduce... at this site <br />i......igated a I ittle too soon at times and could have cut down about one <br />0... two i......igations and ...educed his deep pe...colation. Site 37 had the <br />highest deep pe...colation with 39.2 inches. The produce... of this field <br />also ope...ates site 32 and 42. AI I these fields have excessive deep <br />pe...colation. This indicates that deep pe...colation is dictated mo...e by <br />a p...oduce...'s wate... management method and attitude ...athe... than the type <br />of c...ops g...own 0... any othe... facto.... <br /> <br />Deep pe...colation on alfalfa sites was fai...ly unifo...m th...oughout the <br />i......igation season unl ike sites with annual c...ops IOhe...e most of the <br />deep pe...colation occu......ed du...ing the fi...st i......igation (Table 7). On <br />su...face i......igated alfalfa sites, app...oximately 30% of the seasonal <br />deep pe...colation occu......ed du...ing the fi...st two i......igations (Table 7). <br /> <br />Of the five su...face i......igated alfalfa sites, fou... of them had deep <br />pe...colation in excess of the acceptable deep pe...colation needed fo... <br />leaching (Table 6). Site 16 was unde...-i......igated and had no deep <br />pe...colation. Sites 33 and 36 with side...oll sp...inkle... systems also had <br />excess deep pe...colation. <br /> <br />I......igation efficiency va...ied f...om 35 to 64% with an ave...age of 48%. <br />Compa...ison of alfalfa data f...om 1985 to 1990 shows that in 1990 wate... <br />appl ication inc...eased substantially ove... the p...evious yea...s <Table 8). <br />As a ...esult efficiency d...opped and deep pe...colation inc...eased. <br /> <br />Co...n: Six co...n sites with 104 ac...es we...e monito...ed in 1990. <br />of 41 i......igation events we...e ...eco...ded. Sites 15 and 30 a...e <br />through a c...op ...otation and had alfalfa in 1989. <br /> <br />A total <br />going <br /> <br />The ave...age deep pe...colation fo... the six sites monito...ed was 17.7 <br />inches inches (Table 7) which was less than 1989 with 29.0 inches. <br />The ave...age deep pe...colation fo... co...n was slightly highe... than the <br />ave...age fo... all 25 sites monito...ed <17.0 inches). When only su...face <br />sites a...e compa...ed, the deep pe...colation fo... co...n is less than that of <br />alfalfa, fal I g...ain and beans with 20.2, 20.3 and 26.6 inches <br />...espectively <Table 7). <br /> <br />22 <br />