GROWTH RESPONSE
OF TRANSPLANT AMAN RICE TOWARDS APPLICATION OF MIMOSA INVISA AS GREEN MANURE AND NITROGEN LEVELS
Z. Nasrin*,
M.S.U. Bhuiya, M.F. Karim and M.A.A. Jahan
*Corresponding author; Email: zinatratna@hotmail.com
Abstract
An
experiment was conducted at the Agronomy Field Laboratory of Bangladesh
Agricultural University, Mymensingh to study the growth response of transplant
aman rice with Mimosa invisa as green
manure and different nitrogen levels. Three levels of Mimosa invisa biomass, MO = 0 t ha-1 (
control), M1 = 5 t ha-1 and M2 = 10 t ha-1
and four levels of nitrogen 0% (No = 0 kg N ha-1 ), 25% (N1
= 20.7 kg ha-1), 75% (N2 = 62.1 kg ha-1) and
100% (N3 = 82.8 kg ha-1) of recommended dose (180 kg urea
ha-1) were treatment variables in the study. The experiment was laid
out in a randomized complete block design with four replications. Sixty days
old Mimosa invisa was incorporated
with the soil for green manuring as per treatment. Thirty four days old
seedlings of transplant aman cv. BRRI dhan31 were transplanted in the main
field with two seedlings hill-1 at 20cm spacing between lines and
15cm between hills. The highest plant height (126.39 cm), leaves hill-1
(44.44), leaf area index (LAI) (3.74) and total dry matter (TDM) hill-1 (29.40
g) at 75 days after transplanting (DAT) was
obtained for Mimosa incorporation into the
soil at 10 t ha-1 when this treatment superiority knocked at all growth
stages. Nitrogen at 100% recommended dose (RD) (180 kg ha-1) gave
maximum plant height (129.46 cm), leaves hill-1(47.92), LAI (4.13)
and TDM (30.69 g hill-1) at 75 DAT when treatment nitrogen at 75% RD
had almost closer values of these parameters to nitrogen at 100% RD. The
interaction between Mimosa at 10 t ha-1
and nitrogen at 75% RD produced greater LAI (4.43) and TDM (35.75 g hill-1)
at 75 DAT could be a 25% nitrogen saving treatment for the important growth
characteristics of transplant aman rice for potential grain yield harvest.
Key
words
: Green manure, Mimosa invisa, and
nitrogen.
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Return Volume: Journal of Experimental Biosciences 5(2): July 2014
