Abstract
Abstract Crop growth and yield on sand soils is often limited by low N availability due to leaching losses from the soil. This study was initiated to determine if sulfur‐coated urea (SCU) could supply adequate N nutrition and eliminate the need for repeated N applications for sugarcane ( Saccharum spp.) grown on previously uncropped Immokalee fine sand in southern Florida. Single applications of two SCU's were compared with split applications of (NH 4 ) 2 SO 4 (AS), each at three N rates, 56, 112, and 168 kg/ha. Application of SCU at planting in November resulted in excellent growth and high leaf N concentrations in the spring but did not provide optimum N throughout the growing season. Leaf N concentrations in late summer and tonnages of sugarcane and sugar for SCU plots approached, but did not equal, those attained with four applications of AS. Higher tonnages were recorded for the slower releasing SCU than for the faster releasing source but both SCU sources released large amounts of N before the warm summer months when N is required in the highest quantities. The data indicate that SCU's which release N more slowly and/or a later application date should provide better N nutrition and eliminate the need for several split applications of soluble sources.
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Claims 7
Claim · model-written summary
Sulfur-coated urea at planting produced excellent spring growth and high leaf nitrogen concentrations.
- Taxon
- Sugarcanet0
- Organ / stage
- leafe0
- Treatment
- SCU at planting in Novembere0
- Outcome
- growth and high leaf N concentrationse0
- Direction
- excellente0
Not reportedComparator
Verbatim
e0“Application of SCU at planting in November resulted in excellent growth and high leaf N concentrations in the spring”
t0“Sugarcane”
Claim · model-written summary
Sulfur-coated urea did not provide optimal nitrogen through the growing season.
Verbatim
e0“did not provide optimum N throughout the growing season”
t0“Sugarcane”
Claim · model-written summary
Late-summer leaf nitrogen concentrations under sulfur-coated urea approached but did not equal those under four ammonium sulfate applications.
Verbatim
e0“Leaf N concentrations in late summer and tonnages of sugarcane and sugar for SCU plots approached, but did not equal, those attained with four applications of AS”
t0“Sugarcane”
Claim · model-written summary
Sugarcane and sugar tonnages under sulfur-coated urea approached but did not equal those under four ammonium sulfate applications.
Verbatim
e0“Leaf N concentrations in late summer and tonnages of sugarcane and sugar for SCU plots approached, but did not equal, those attained with four applications of AS”
Claim · model-written summary
The slower-releasing sulfur-coated urea produced higher tonnages than the faster-releasing source.
Verbatim
e0“Higher tonnages were recorded for the slower releasing SCU than for the faster releasing source”
t0“Sugarcane”
Claim · model-written summary
Both sulfur-coated urea sources released large amounts of nitrogen before the warm summer months.
Verbatim
e0“both SCU sources released large amounts of N before the warm summer months”
t0“Sugarcane”
Claim · model-written summary
The authors recommend slower-releasing sulfur-coated urea or a later application to improve nitrogen nutrition and avoid multiple split soluble fertilizer applications.
Verbatim
e0“SCU's which release N more slowly and/or a later application date should provide better N nutrition and eliminate the need for several split applications of soluble sources”
t0“Sugarcane”
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