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April 25,2001 <br /> Job Number:LG01=098 .. <br /> Page 10 <br /> soil'solution moves along with the water. Ammonium (NH4�} forms of N haveg <br /> Pa r ositive char e ' <br /> . . <br /> and are held by the negative sites on the clay in the soil;therefore, NH,'forms of N leach very <br /> little. In sands where there is very little clay, ammonium farms of N can leach. Coarse=textured <br /> - sands and some muck soils are.the only soils where ammonium-leaching may be,signifcant. <br /> , <br /> One way to minimize N leaching and denitrification is to minimize the time the N,is in the soil <br /> 'before plant uptake.This cuts down on the time when conditions are.favorable.for losses.$ 'The <br /> soil.profile_within the proposed septic field,was found to consist of fine grained clayey soils. <br /> According to Don Gianneechini, an agricultural consultant for John-Taylor Fertilizer; the <br /> farm has been typically using between 70 to 140 IN per acre fertilizer depending on'the crop. <br /> For some'crops.like soybeans, no fertilizers.are applied. ,Mr- Giannecchini typically collects soil <br /> 'samples,on' the site about ever,other ye'ar,or prior to planting a tomato crop. The sample is f <br /> analyzed for residual nitrogen and other nutrients. Petiole analysis is also peiformed ony the plant <br /> parts, several times per season to monitor the appropriate application of nutrients and irrigation. ` <br /> �. These tests help to-check and maintain that the correct amount.of fertilizer, nutrients, and <br /> irrigation is being applied to the row crops. The growers determine and apply the appropriate.'. <br /> amount of irrigation for.the crop.. <br /> F; . <br /> For`the purposeof the nitrate loading study, the irrigation, fertilization, and uptake of <br /> nitrogen will be considered in balance(eg: irrigation­and nutrients are being consumed by the <br /> row crops and minimal leaching of nitrogen and over`waterin <br /> p g g g is occurrin g) • <br /> ` The following table is'a summary of the Nitrate Loading-Analysis (see Plates 4 through <br /> S) which considers nitrate sources from septic,systems-and-rainfall. <br /> a Vitosh,M.L.,J.W.Johnson►and D.B. Mengel;July 1995.Tri-state.Fertilizer Recommendations for '• : <br /> Corn, §o' ybeans, Wheat and Alfalfa,Extension Bulletin E-2567. <br /> - •_ r}DE ASO <br />