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- Title
Decreasing nitrogen leaching from sandy soil with ammonium-loaded clinoptilolite
- Authors
Norton, J. M.; Boettinger, J. L.; Drost, D. T.; Perrin, T. S.
- Abstract
Nitrogen (N) loss from irrigated cropland, particularly sandy soils significantly contributes to nitrate (NO3- ) levels in surface and ground waters. In this study, as a preface to a plant growth study, we compared N leaching from NH4+-loaded clinoptilolite (A-Cp) and (NH4)SO4 (AS) in two media: a rounded quartz sand and a sandy soil. We hypothesized that quartz sand or soil amended with A-Cp would lea significantly less N than these-media amended with AS, and that more N would leach from smaller A-Cp size fractions than from large A-cp size fractions. Ammonium sulfate, or one of the three A-Cp size fractions, small(<0.25 mm), medium (0.25--2 mm), or large (24 mm), was banded at a depth of 5 cm in leaching columns filled with inert quartz sand at a rate of 112, 224, or 336 kg N ha-1. The experiment was repeated with sandy soil in greenhouse pots at rates of 112 and 224 kg N ha-1. The columns and pots were leached for about 40 d with a simulated irrigation water. Significantly more N, as NH4+ and NO3-, leached from AS amendments than any of the A-Cp amendments in both experiments. Results indicated that the larger the A-Cp size fraction, the slower NH4+ is released from A-Cp. Ammonium Cp slowly releases N and could significantly minimize N leaching from sandy soils comparedto AS.
- Subjects
GROUNDWATER pollution; NITROGEN; WATER quality monitoring
- Publication
Journal of Environmental Quality, 1998, Vol 27, Issue 3, p656
- ISSN
0047-2425
- Publication type
Article