In situ measurements of nitrate leaching implicate poor nitrogen and irrigation management on sandy soils

Minimizing the risk of nitrate contamination along the waterways of the U.S. Great Plains is essential to continued irrigated corn production and quality water supplies. The objectives of this study were to quantify nitrate (NO3) leaching for irrigated sandy soils (Pratt loamy fine sand [sandy, mixe...

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Veröffentlicht in:Journal of environmental quality 2005-11, Vol.34 (6), p.2243-2254
Hauptverfasser: Gehl, R.J, Schmidt, J.P, Stone, L.R, Schlegel, A.J, Clark, G.A
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container_issue 6
container_start_page 2243
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creator Gehl, R.J
Schmidt, J.P
Stone, L.R
Schlegel, A.J
Clark, G.A
description Minimizing the risk of nitrate contamination along the waterways of the U.S. Great Plains is essential to continued irrigated corn production and quality water supplies. The objectives of this study were to quantify nitrate (NO3) leaching for irrigated sandy soils (Pratt loamy fine sand [sandy, mixed, mesic Lamellic Haplustalfs]) and to evaluate the effects of N fertilizer and irrigation management strategies on NO3 leaching in irrigated corn. Two irrigation schedules (1.0x and 1.25x optimum) were combined with six N fertilizer treatments broadcast as NH4NO3 (kg N ha(-1)): 300 and 250 applied pre-plant; 250 applied pre-plant and sidedress; 185 applied pre-plant and sidedress; 125 applied pre-plant and sidedress; and 0. Porous-cup tensiometers and solution samplers were installed in each of the four highest N treatments. Soil solution samples were collected during the 2001 and 2002 growing seasons. Maximum corn grain yield was achieved with 125 or 185 kg N ha(-1), regardless of the irrigation schedule (IS). The 1.25x IS exacerbated the amount of NO3 leached below the 152-cm depth in the preplant N treatments, with a mean of 146 kg N ha(-1) for the 250 and 300 kg N preplant applications compared with 12 kg N ha(-1) for the same N treatments and 1.0x IS. With 185 kg N ha(-1), the 1.25x IS treatment resulted in 74 kg N ha(-1) leached compared with 10 kg N ha(-1) for the 1.0x IS. Appropriate irrigation scheduling and N fertilizer rates are essential to improving N management practices on these sandy soils.
doi_str_mv 10.2134/jeq2005.0047
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The objectives of this study were to quantify nitrate (NO3) leaching for irrigated sandy soils (Pratt loamy fine sand [sandy, mixed, mesic Lamellic Haplustalfs]) and to evaluate the effects of N fertilizer and irrigation management strategies on NO3 leaching in irrigated corn. Two irrigation schedules (1.0x and 1.25x optimum) were combined with six N fertilizer treatments broadcast as NH4NO3 (kg N ha(-1)): 300 and 250 applied pre-plant; 250 applied pre-plant and sidedress; 185 applied pre-plant and sidedress; 125 applied pre-plant and sidedress; and 0. Porous-cup tensiometers and solution samplers were installed in each of the four highest N treatments. Soil solution samples were collected during the 2001 and 2002 growing seasons. Maximum corn grain yield was achieved with 125 or 185 kg N ha(-1), regardless of the irrigation schedule (IS). The 1.25x IS exacerbated the amount of NO3 leached below the 152-cm depth in the preplant N treatments, with a mean of 146 kg N ha(-1) for the 250 and 300 kg N preplant applications compared with 12 kg N ha(-1) for the same N treatments and 1.0x IS. With 185 kg N ha(-1), the 1.25x IS treatment resulted in 74 kg N ha(-1) leached compared with 10 kg N ha(-1) for the 1.0x IS. Appropriate irrigation scheduling and N fertilizer rates are essential to improving N management practices on these sandy soils.</description><subject>Agriculture - methods</subject><subject>Agriculture - organization &amp; administration</subject><subject>Agronomy. Soil science and plant productions</subject><subject>ammonium nitrate</subject><subject>Applied sciences</subject><subject>Biological and medical sciences</subject><subject>Corn</subject><subject>Crop production</subject><subject>drinking water</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Environmental quality</subject><subject>Exact sciences and technology</subject><subject>fertilizer rates</subject><subject>Fertilizers</subject><subject>Fundamental and applied biological sciences. 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Soil science and plant productions</topic><topic>ammonium nitrate</topic><topic>Applied sciences</topic><topic>Biological and medical sciences</topic><topic>Corn</topic><topic>Crop production</topic><topic>drinking water</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Environmental quality</topic><topic>Exact sciences and technology</topic><topic>fertilizer rates</topic><topic>Fertilizers</topic><topic>Fundamental and applied biological sciences. 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The 1.25x IS exacerbated the amount of NO3 leached below the 152-cm depth in the preplant N treatments, with a mean of 146 kg N ha(-1) for the 250 and 300 kg N preplant applications compared with 12 kg N ha(-1) for the same N treatments and 1.0x IS. With 185 kg N ha(-1), the 1.25x IS treatment resulted in 74 kg N ha(-1) leached compared with 10 kg N ha(-1) for the 1.0x IS. Appropriate irrigation scheduling and N fertilizer rates are essential to improving N management practices on these sandy soils.</abstract><cop>Madison</cop><pub>American Society of Agronomy, Crop Science Society of America, Soil Science Society</pub><pmid>16275726</pmid><doi>10.2134/jeq2005.0047</doi><tpages>12</tpages></addata></record>
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subjects Agriculture - methods
Agriculture - organization & administration
Agronomy. Soil science and plant productions
ammonium nitrate
Applied sciences
Biological and medical sciences
Corn
Crop production
drinking water
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental quality
Exact sciences and technology
fertilizer rates
Fertilizers
Fundamental and applied biological sciences. Psychology
grain yield
groundwater contamination
Groundwater pollution
Growing season
human health
In situ measurement
Irrigation
Irrigation scheduling
Kansas
Leaching
Nitrate content
nitrate nitrogen
Nitrates
Nitrates - analysis
Nitrogen
Nitrogen - metabolism
nitrogen fertilizers
Plant Roots
Pollution
Pollution, environment geology
Random Allocation
Risk reduction
Samplers
Sandy soils
Silicon Dioxide
Soil
Soil contamination
Soil solution
Soil testing
soil texture
Tensiometers
Water management
water pollution
water quality
Water supply
Waterways
Zea mays
title In situ measurements of nitrate leaching implicate poor nitrogen and irrigation management on sandy soils
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