Journal
JOURNAL OF PLANT NUTRITION
Volume 39, Issue 11, Pages 1589-1596Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2016.1161778
Keywords
Amine; canopy reflectance; desiccation; multispectral radiometry; salt index
Categories
Funding
- Pennsylvania Turfgrass Council
- Plant Impact Inc.
- ARS [ARS-0422842, 813285] Funding Source: Federal RePORTER
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Two independent trials were conducted on a creeping bentgrass (Agrostis stolonifera L.) putting green (PG) to evaluate early-response of canopy quality, growth, and nutrient use to rate and/or type of foliarly-applied nitrogen (N) fertilizer. Treatments were prepared using soluble Amine' or Salt' 15N-0 phosphorus (P)-5.8potassium (K) fertilizer and applied N at 0, 24.5, 37, or 49kg ha(-1). Clipping yields were weighed and digested for N content. Normalized differential vegetative (NDVI) and dark green color (DGCI) indices were determined by canopy reflectance. Relative to the Salt fertilizer, the Amine supported greater mean growth and N offtake rates and higher mean NDVI and DGCI. Two and five days after treatment (DAT), salt-fertilizer treated plots showed lesser canopy quality relative to Amine. These differences increased with N rate, likely due to the greater solute concentration of the Salt fertilizer. Eight to 21 DAT, fewer differences were observed by fertilizer type or rate.
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