Abstract
High N fertilizer and irrigation amounts applied to potato (Solanum tuberosum L.) on coarse-textured soils often result in nitrate (NO3) leaching and low recovery of applied fertilizer N. This 3-yr study compared the effects of two rates (140 and 280 kg N ha(-1)) of a single polyolefin-coated urea (PCU) application versus split applications of urea on 'Russet Burbank' potato yield and on NO3 leaching and N recovery efficiency (RE) on a loamy sand. Standard irrigation was applied in all years and excessive irrigation was used in another experiment in the third year. At the recommended rate of 280 kg N ha(-1), NO3 leaching during the growing season was 34 to 49% lower with PCU than three applications of urea. Under standard irrigation in the third year, leaching from five applications of urea (280 kg N ha(-1)) was 38% higher than PCU. Under leaching conditions in the first year (> or = 25 mm drainage water in at least one 24-h period) and excessive irrigation in the third year, PCU at 280 kg N ha(-1) improved total and marketable tuber yields by 12 to 19% compared with three applications of urea. Fertilizer N RE estimated by the difference and 15N isotope methods at the 280 kg N ha(-1) rate was, on average, higher with PCU (mean 50%) than urea (mean 43%). Fertilizer N RE values estimated by the isotope method (mean 51%) were greater than those estimated by the difference method (mean 47%). Results from this study indicate that PCU can reduce leaching and improve N recovery and tuber yield during seasons with high leaching.
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Claims 5
Claim · model-written summary
At 280 kg N ha-1, nitrate leaching during the growing season was 34 to 49% lower with polyolefin-coated urea than with three urea applications.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- PCUe0
- Outcome
- NO3 leaching during the growing seasone0
- Direction
- lowere0
- Value
- 34 to 49%e0
- Qualifier
- recommended rate of 280 kg N ha(-1)e0
- Comparator
- three applications of ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the recommended rate of 280 kg N ha(-1), NO3 leaching during the growing season was 34 to 49% lower with PCU than three applications of urea”
t0“Potato”
Claim · model-written summary
Under standard irrigation in the third year, leaching from five urea applications (280 kg N ha-1) was 38% higher than from polyolefin-coated urea.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- five applications of urea (280 kg N ha(-1))e0
- Outcome
- leachinge0
- Direction
- highere0
- Value
- 38%e0
- Qualifier
- standard irrigation in the third yeare0
- Comparator
- PCUe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under standard irrigation in the third year, leaching from five applications of urea (280 kg N ha(-1)) was 38% higher than PCU”
t0“Potato”
Claim · model-written summary
Under leaching conditions in year one and excessive irrigation in year three, polyolefin-coated urea at 280 kg N ha-1 improved total and marketable tuber yields by 12 to 19% compared with three urea applications.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- PCU at 280 kg N ha(-1)e0
- Outcome
- total and marketable tuber yieldse0
- Direction
- improvede0
- Value
- 12 to 19%e0
- Qualifier
- excessive irrigation in the third yeare0
- Comparator
- three applications of ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under leaching conditions in the first year (> or = 25 mm drainage water in at least one 24-h period) and excessive irrigation in the third year, PCU at 280 kg N ha(-1) improved total and marketable tuber yields by 12 to 19% compared with three applications of urea”
t0“Potato”
Claim · model-written summary
Fertilizer N recovery efficiency at 280 kg N ha-1 was on average higher with polyolefin-coated urea (mean 50%) than with urea (mean 43%).
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- PCUe0
- Outcome
- Fertilizer N REe0
- Direction
- highere0
- Value
- mean 50%e0
- Qualifier
- urea (mean 43%)e0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N RE estimated by the difference and 15N isotope methods at the 280 kg N ha(-1) rate was, on average, higher with PCU (mean 50%) than urea (mean 43%)”
t0“Potato”
Claim · model-written summary
Fertilizer N recovery efficiency estimated by the isotope method (mean 51%) was greater than that estimated by the difference method (mean 47%).
Verbatim
e0“Fertilizer N RE values estimated by the isotope method (mean 51%) were greater than those estimated by the difference method (mean 47%)”
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