草坪植物氮素營養與需肥診斷之研究(二)
Date Issued
1999
Date
1999
Author(s)
DOI
882313B002064
Abstract
The objectives of this research were to determinate the effect of N (Nitrogen) on the
growth of tropical carpetgrass and centipegegrass, and evaluate the feasibility of using a
chlorophyll meter for predicting nitrogen status. In the experimental period (Spring 1999),
the plants were applied once Osmocote (6g/pot) combining with NH4NO3 at the rates of 0.0,
2.5, 5.0, or 10.0 g N/m2/mo. Beside, there was a non-fertilized treatment (Control). The
results showed that the tropical carpetgrass plants with 5.0+O6 and 10.0+ O6 treatments had
higher growth rate, and centipedegrass with 10.0+O6 treatment had higher growth rate,
plant height and number of tiller than the others. In both turfgrasses, the plant height,
growth rate, leaf length, number of tiller, and shoot dry weight of the four treatment plants
with slow release fertilizer were significantly increased when compared to that of control
plants.
There was a significantly positive linear correlation between chlorophyll meter readings
(CMR) and leaf nitrogen controls (Na or Ndw) in both turfgrasses. The correlation
coefficients of CMR with Na and Ndw were 0.77*** and 0.91*** respectively in tropical
carpetgrass, and 0.76*** and 0.90*** in centipegegrass. Nitrate testing is alternative
method to evaluate nitrogen status. When using nitrate testing in tropical carpetgrass,
centipegegrass and bermudagrass, the results showed that the nitrate content could not be
detected in low-nitrogen leaves and the contents variable in high-nitrogen leaves. Therefore,
using chlorophyll meter reading is a more reasonable method to predict nitrogen status in
turfgrasses.
Subjects
bermudagrass
centipedegrass
chlorophyll meter
diagnosis of nitrogen, nitrate
nitrogen fertilizer
tropical carpetgrass
SDGs
Publisher
臺北市：國立臺灣大學園藝學系暨研究所
Type
report
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