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Guiding fall fertilization of cool‐season turfgrass lawns with verdure tissue‐N tests.

Guiding fall fertilization of cool‐season turfgrass lawns with verdure tissue‐N tests.

Authors :
Guillard, Karl
Miele, Kevin M.
Sürer, Irfan
Morris, Thomas F.
Source :
Crop Science. May2021, Vol. 61 Issue 3, p2090-2112. 23p.
Publication Year :
2021

Abstract

Objective tests are not widely used to guide fall N fertilization of turfgrasses, and N is applied at predetermined rates regardless of plant‐N status. This study was conducted across 3 yr in Connecticut to determine if fall verdure concentrations of total N, dry‐tissue extractable nitrate (NO3)–N, and fresh sap NO3–N could guide fall N fertilization for a mixed‐species, cool‐season turfgrass lawn. Field experiments were set out with varying fall N rates and verdure samples were collected weekly in October and November. Verdure tissue‐N test concentrations in response to N rates were analyzed with polynomial (quadratic or cubic) and linear‐response and plateau (LRP) models. Models were significant (P <.0001) for all tissue concentrations in response to N rates and estimates were comparable between models. When referenced to expected responses from the commonly recommended fall N rates of 24.5, 49, and 98 kg ha−1, there would be no need for N fertilizer when concentrations of fall verdure total N are ≥22, ≥25, and ≥30 g kg−1; dry‐tissue extractable NO3–N are ≥119, ≥193, and ≥840 mg kg−1; and fresh sap NO3–N are ≥94, ≥115, and ≥171 mg L−1, respectively. Variability of the verdure tissue‐N tests was no greater than most routine soil and tissue tests currently used to monitor nutrient status in turfgrasses. The results suggest that verdure tissue‐N tests have potential in guiding fall N fertilization of cool‐season turfgrass lawns. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
*LAWNS
*SOIL testing
*TURFGRASSES

Details

Language :
English
ISSN :
0011183X
Volume :
61
Issue :
3
Database :
Academic Search Index
Journal :
Crop Science
Publication Type :
Academic Journal
Accession number :
150698315
Full Text :
https://doi.org/10.1002/csc2.20406