PHYSIOLOGICAL
ATTRIBUTES OF TRANSPLANT AMAN RICE AS AFFECTED BY GREEN MANURING AND NITROGEN
LEVELS
Z. Nasrin*, M.S.U. Bhuiya and M.F.
Karim
*Corresponding author
Email: zinatratna@hotmail.com
Abstract
A field experiment was carried out
at Bangladesh Agricultural University (BAU), Mymensingh to assess the response
of physiological attributes of transplant aman rice under different green
manuring and nitrogen levels. The treatments consisted of three levels of Mimosa
invisa biomass; M0= 0 t ha-1(control),M1= 5 t ha-1 and M2=10 t ha-1 and
four levels of nitrogen N0= 0% N ha-1(control), N1= 25% N ha-1 (20.7 kg N ha-1),
N2= 75% N ha-1(62.1 kg N ha-1) and N3 = 100% N ha-1of recommended dose (82.8 kg
N ha-1). Incorporation of Mimosa invisa biomass at different rates in
soil changed significantly the values of physiological attributes such as
specific leaf area (SLA), crop growth rate (CGR), relative growth rate (RGR),
net assimilation rate (NAR) values. The application of 10 t ha-1 of Mimosa
invisa biomass gave highest specific leaf area i.e. 270.54 cm2 g-1 at 50
DAT but lowest SLA i.e. 174.025 cm2 g-1 at 75 DAT. CGR (18.68 gm-2day-1), RGR
(0.085 gg-1 day-1) and NAR (0.011 mgdm-2day-1) values were greater with Mimosa
invisa at 5 to 10 t ha-1at early growth stage when no Mimosa invisa had
better RGR (0.028gg-1 day-1) and NAR (0.006 mgdm-2day-1) at the middle of
growth stages. Application of 100% RD and 25% RD gave maximum SLA at 25 DAT when
75% RD showed highest (262.68 cm2g-1) at 50 DAT but no difference was marked at
75 DAT. 75% RD produced early maximum CGR (20.23 gm-2day-1), RGR (0.087gg-1day-1)
and NAR (0.010 mgdm-2day-1) when no nitrogen gave lower CGR and RGR at early
stage but produced greater NAR (0.006 mgdm-2day-1). Mimosa invisa either
at 5 or 10 t ha-1 along with 25 to 75% RD producing maximum SLA, CGR, RGR and
NAR at early growth stage for good support of growth, development and yield of
aman rice.
Keywords :
Physiological attributes, Green manure, Mimosa invisa and nitrogen.
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Return Volume: Journal of
Experimental Biosciences 6(1): January 2015
