Growth analysis of wheat var. bari gom‐26 as affected by foliar spray of naa at different nitrogen fertilizer levels

Abstract

Leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR),
net assimilation rate (NAR) and leaf area duration (LAD) of a variety of wheat
(Triticum aestivum L.) were studied with three concentrations (0, 25 and 50 ppm)
of naphthalene acetic acid (NAA) and four levels (0, 50, 75 and 100 %) of Nfertilizer
in a field experiment during 2014 ‐ 2015. Results showed that LAI and
LAD at all stages of growth increased from control and their peak values were
recorded mostly from 25 ppm NAA in combination with 75 % N‐fertilizer and 50
ppm NAA in combination with 50% N‐fertilizer. RGR was affected both
positively and negatively depending on the concentration of NAA and nitrogen
levels and was higher at earlier age (15 to 45 DAS) as opposed to later stage
irrespective of treatments. CGR and NAR were also affected positively and
negatively and tended to increase sharply reaching maximum at 30 ‐ 45 DAS
with a few exceptions and then decreased for most of the treatments with the
progression of age. At 30 ‐ 45 DAS, peak value of CGR was recorded from 25
ppm NAA in combination with 75% N‐fertilizer. Of all the treatments, 25 ppm
NAA in combination with 75% N‐fertilizer produced better stimulation.