| dc.description.abstract | The experiment was conducted at the research farm and laboratory of Crop Physiology and
Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur,
Bangladesh in 2014 - 2015 and 2015 - 2016 to study the morpho-physiological parameters,
phenological stages, water relations, chlorophyll content, proline accumulation, nitrogen
uptake, protein content, N use efficiency, yield and yield contributing characters of wheat.
Benefit-cost ratio was calculated for cultivation of two varieties. Four levels of irrigations (i) I0-
Rain-fed condition (control) (ii) I1- One irrigation (30 mm) (iii) I2- Two irrigations (30+30 =60
mm) and (iv) I3- Three irrigations (30+30+30 =90 mm) and four split application of nitrogen
were (i) N0- control (no nitrogen) (ii) N1- total nitrogen at basal dose (iii) N2- one third of the N
fertilizer was applied at basal dose, one third of the N fertilizer was applied at crown root
initiation stage and the rest was applied at maximum tillering stage and (iv) N3- one fourth of
the N fertilizer was applied at basal dose, one fourth of the N fertilizer was applied at crown
root initiation stage, one forth was applied at maximum tillering stage and the rest was applied
at heading stage. Two wheat varieties, namely, BARI Gom 24 and BARI Gom 26 were tested
for the above mentioned parameters. The experiment was laid out in a split-split plot design
with 3 replications. Irrigation and nitrogen treatments had significant effects on all above
mentioned parameters in both the years. The plants grown in three irrigations (I3) condition
needed the highest days for attaining their different phenological stages. Three irrigations
exhibited the highest crop growth, morpho-physiological traits, water consumption, chlorophyll
content, yield contributing characters, nitrogen uptake, grain and straw yield of wheat. With
some exceptions, varieties had no significant effects on all the above mentioned parameters in
this study. Among the nitrogen treatments, the highest crop growth, morpho-physiological
traits, yield contributing characters, nitrogen uptake, protein content, N use efficiency, grain
and straw yield were recorded in three split (N2) applications of nitrogen in both the years.
Simple correlation coefficients between the yield contributing characters and grain yield for
different irrigation and nitrogen treatments indicated that grain yield was positively correlated
with yield components. In case of benefit-cost ratio, the highest benefit-cost ratio was found
from BARI Gom 24 with three irrigations and three split applications of nitrogen. Wheat
production with three irrigations gave the highest crop growth, morpho-physiological traits,
water consumption, yield contributing characters, nitrogen uptake, grain and straw yield which
were statistically similar with two irrigations. For the efficient use of nitrogen for wheat
cultivation N fertilizer should be applied as three splits such as at basal, at CRI and during
maximum tillering stages. | en_US |
