EurekaMag.com logo
+ Translate

Estimation of nitrate concentrations in groundwater using a whole farm nitrogen budget


, : Estimation of nitrate concentrations in groundwater using a whole farm nitrogen budget. Journal of Environmental Quality 22(4): 767-775

Contamination of groundwater under agricultural land by NO-3 is influenced by the kind of farming system. One possible method of selecting farming systems that result in less NO-3 leaching is to calculate whole farm N budgets, that are simplified by assuming soil-N remains constant from one cycle of a rotation to the next. This method was applied to two model crop rotations using average crop yield data for two regions of Ontario, and to a cash-crop farm and a dairy farm using information on purchases, sales, and crop yields, for these farms. The model rotations were corn (Zea mays L.)-soybean (Glycine max (L.) Merr.)-wheat (Triticum aestivum L.) and corn-soybean-wheat-hay (mixture of timothy, Phleum pratense L. and alfalfa, Medicago sativa L.)-hay-hay. Atmospheric deposition (18.4 kg N ha-1 yr) was obtained by literature review. Symbiotic N-2 fixation by legume crops with different yields was estimated from regression equations. A net surplus in the N balance was converted to maximum mean NO-3-N concentration in groundwater by assuming a groundwater recharge rate of 160 mm yr-1, and no denitrification. Predicted NO-3-N concentrations in leachate for the model corn-soybean-wheat rotation were greater for southwestern Ontario (22.4 mg L-1) than western Ontario (8.5 mg L-), probably because more N fertilizer was recommended in the southwest. Including hay in the model rotation increased the amount of N leached by a factor of two in western Ontario, but only by 9% in the southwest. Predicted NO-3-N concentration in groundwater for the cash crop farm was 6.7 mg L-1, compared with an average measured value of 9.5 mg L-1 in the tile drainage water. For the dairy farm the predicted value was 58 mg L-1, and a measured value was not available. The simplified N balance method provided useful estimates of potential NO-3 leaching losses even though it relied on some major assumptions. A major uncertainty was atmospheric deposition of ammonia volatilized from on-farm sources. Denitrification could be as much as 62 kg N ha-1 yr-1 under continuous production of grain corn, based on differences between N present after harvest and amount of N leached.

(PDF 0-2 workdays service)

Accession: 002373323

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Barry, D.A.J.; Goorahoo, D.; Goss, M.J., 1993: Estimation of nitrate concentration in groundwater using a whole farm nitrogen budget. Journal of Environmental Quality 22: 7-75

Anonymous, 1987: Nitrate pollution of groundwater agricultural contribution to diminishing groundwater nitrate pollution b soil scientific production ecological and geohydrochemical aspects 1 estimation of potential nitrate pollution regionally differentiated estimation of potential nitrate pollution of seepage water by agriculture in west germany

Goss, M.J.; Barry, D.A.J.; Goorahoo, D.; Smith, P.S., 1994: A nitrogen budget prediction of nitrate in ground water at a farm using sewage sludge. Clapp, C E [Editor], Larson, W E [Editor], Dowdy, R H [Editor] SSSA Miscellaneous Publication; Sewage sludge: Land utilization and the environment 231-236

Puckett, L.; Cowdery, T.; Lorenz, D.; Stoner, J., 1999: Estimation of nitrate contamination of an agro-ecosystem outwash aquifer using a nitrogen mass-balance budget. A mass-balance budget of N cycling was developed for an intensive agricultural area in west-central Minnesota to better understand NO3(-) contamination of ground water in the Otter Tail outwash aquifer. Fertilizer, biological fixation, atmospheric...

Anonymous, 1987: Nitrate pollution in groundwater agriculture contribution to diminishing nitrate pollution of groundwater c estimation of production functions estimation of production functions of organic and mineral nitrate fertilizer

Witheetrirong, Y.; Tripathi, N.Kumar.; Tipdecho, T.; Parkpian, P., 2012: Estimation of the effect of soil texture on nitrate-nitrogen content in groundwater using optical remote sensing. The use of chemical fertilizers in Thailand increased exponentially by more than 100-fold from 1961 to 2004. Intensification of agricultural production causes several potential risks to water supplies, especially nitrate-nitrogen (NO(3) (-)-N) pol...

Anonymous, 1987: Nitrate pollution of groundwater agricultural contribution to diminishing nitrate pollution of groundwater b soil scientific production ecological and geohydrochemical aspects 2 nitrate inflow and removal nitrate inflow into groundwater and nitrate degradation in aquifers

Yoo, S.H.; Choi, W.J.ng; Han, G.H.un; Park, J.G.un; Lee, S.M.; Jin, S.A., 1999: Temporal variations in isotope ratios and concentrations of nitrate-nitrogen in groundwater as affected by chemical fertilizer and livestock manure. Isotope ratio (15N/14N) and nitrate-nitrogen concentration in groundwater were measured to investigate the effect of chemical fertilizer and livestock manure on temporal variations in nitrate-nitrogen concentration and to estimate the contribution...

Knowles, T.C.; Doerge, T.A.; Ottman, M.J., 1991: Improved nitrogen management in irrigated durum wheat using stem nitrate analysis ii. interpretation of nitrate nitrogen concentrations. Attempts to characterize the N status of irrigated spring wheat (Triticum aestivum L.) using basal stem nitrate-N (NO3-N) tissue tests have shown contradictory results due to the narrow range of agronomic conditions existing in most studies. Five...

Widmann, K.; Gebauer, G.; Rehder, H.; Ziegler, H., 1993: Fluctuations in nitrate reductase activity, and nitrate and organic nitrogen concentrations of succulent plants under different nitrogen and water regimes. The CAM (Crassulacean acid metabolism) succulent species Kalanchoe daigremontiana, K. tubiflora and Crassula argentea, and the succulent C-3 species Peperomia obtusifolia, were cultivated in pure culture in open-air conditions under two different...