Abstract:
This study was performed with
GreenSeeker technology in order to
determine the possibility of nitrogen stress
management in cotton and to determine the
differences between the normalized
difference vegetative index (NDVI) and
nitrogen doses determined with
GreenSeeker, to determine the nitrogen
deficiency and stress conditions by making
use of the value of the NDVI in cotton
production and to intervene when necessary
and direct the producers in this regard. In the
study six nitrogen doses (Control, 60, 120,
180, 240 and 300 kg ha-1) were used. The
results showed significant differences
between N applications for leaf chlorophyll
content (SPAD), NDVI-2 (in the boll
formation period), number of bolls (NB),
seed cotton (SCY) and fiber yield (FY). On
the other hand, there were non-significant
differences in terms of (LA) area, NDVI-1
(in the beginning of the flowering), plant
height (PH), node number of first fruiting
branches (NNFFB), number of monopodial
branches (NMB) and number of sympodial
branches (NSB), number of nodes (NN),
height to node ratio (HNR), seed cotton boll
weight (SCBW) and ginning percentage
(GP). The highest SCY and FY obtained
were from doses of 180 and 120 kg ha-1 N,
the highest leaf chlorophyll content and
number of bolls obtained were from doses of
120 kg ha-1 N. The highest values of NDVI-2
obtained were from doses of 120, 240 and
300 kg ha-1 N, respectively. There were nonsignificant
differences between N doses for
values of the NDVI-1 of flowering, but
significant differences observed for values of
NDVI-2 of boll formation periods. The
findings obtained from this research
indicated that leaf chlorophyll and NDVI of
the boll formation period can be used for
determining differences due to varying N
doses in cotton production.
