Abstract
Abstract Two greenhouse experiments were conducted to determine the relative efficiencies of SCU (sulfur‐coated urea) and urea with and without N‐Serve [2‐chloro‐6‐(trichloromethyl)pyridine] or S on growth, uptake and subsequent losses of N from sugarcane (a trispecies hybrid of Saccharum ) grown on Arredondo fs (a loamy, siliceous, hyperthermic Grossarenic Paleudult). In the first experiment, three SCU products, with initial dissolution rates of 32.5, 29.6, and 26.8% of the total N in water during a 7‐day period were compared with urea, urea applied in two application, urea + N‐Serve, and urea + powdered S at the equivalent amount of S in SCU. In the second experiment SCU‐30 was compared with urea, urea applied in two applications, urea + N‐Serve, and urea + powdered S at two irrigation regimes (36 and 48 mm/week). Nitrogen fertilizers were applied at rates of 1.78 g/pot of N. Growth and uptake of N by sugarcane plants were not significantly different among treatments, but there were significant differences in leached and residual N. Nitrogen leaching varied from 6 to 24% of applied N depending on the fertilizer treatment and irrigation level. Leaching of the applied N was mainly in the NO 3 ‐ form, but when irrigation took place before the N hydrolyzed from urea was completely nitrified, leaching in the NH 4 + form was of considerable magnitude. The least N leaching resulted from application of SCU. Inclusion of N‐Serve with urea did not improve fertilizer efficiency. Under the conditions of these experiments, SCU was more promising for commercial use than was granular urea mixed with N‐Serve. Leaching losses of N from all the sources increased with irrigation but to a varying degree. Eleven to fifteen percent of the applied N was not accounted for by the plant, leachate or soil. These results generally agree with those of a previous field experiment conducted by the authors on the same soil.
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Claims 11
Claim · model-written summary
Sugarcane growth did not differ significantly among fertilizer treatments.
Not reportedComparator
Verbatim
e0“Growth and uptake of N by sugarcane plants were not significantly different among treatments”
Claim · model-written summary
Sugarcane nitrogen uptake did not differ significantly among fertilizer treatments.
Not reportedComparator
Verbatim
e0“Growth and uptake of N by sugarcane plants were not significantly different among treatments”
Claim · model-written summary
Leached and residual nitrogen differed significantly among treatments.
Not reportedDirection
Verbatim
e0“but there were significant differences in leached and residual N”
t0“Sugarcane”
Claim · model-written summary
Nitrogen leaching ranged from 6 to 24% of applied nitrogen by fertilizer and irrigation.
Verbatim
e0“Nitrogen leaching varied from 6 to 24% of applied N depending on the fertilizer treatment and irrigation level”
t0“Sugarcane”
Claim · model-written summary
Applied nitrogen leached mainly as nitrate.
Verbatim
e0“Leaching of the applied N was mainly in the NO 3 ‐ form”
t0“Sugarcane”
Claim · model-written summary
Early irrigation before complete nitrification caused considerable ammonium leaching.
Verbatim
e0“when irrigation took place before the N hydrolyzed from urea was completely nitrified, leaching in the NH 4 + form was of considerable magnitude”
t0“Sugarcane”
Claim · model-written summary
SCU application produced the least nitrogen leaching.
Not reportedComparator
Verbatim
e0“The least N leaching resulted from application of SCU”
t0“Sugarcane”
Claim · model-written summary
N-Serve with urea did not improve fertilizer efficiency.
- Taxon
- sugarcanet0
- Treatment
- Inclusion of N‐Serve with ureae0
- Outcome
- fertilizer efficiencye0
- Direction
- did not improvee0
Not reportedComparator
Verbatim
e0“Inclusion of N‐Serve with urea did not improve fertilizer efficiency”
t0“Sugarcane”
Claim · model-written summary
The authors judged SCU more promising for commercial use than urea plus N-Serve.
Verbatim
e0“SCU was more promising for commercial use than was granular urea mixed with N‐Serve”
t0“Sugarcane”
Claim · model-written summary
Irrigation increased nitrogen leaching losses from all sources to varying degrees.
Verbatim
e0“Leaching losses of N from all the sources increased with irrigation but to a varying degree”
t0“Sugarcane”
Claim · model-written summary
Eleven to fifteen percent of applied nitrogen was unaccounted for by plant, leachate or soil.
Verbatim
e0“Eleven to fifteen percent of the applied N was not accounted for by the plant, leachate or soil”
t0“Sugarcane”
The same questions in other papers
nitrogen · nutrient: efficiency · Saccharum officinarum (sugarcane)Positive and negative results
4 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.