| dc.description | The ultimate goal for which the crop scientists are striving, is to increase production of crop
plants under conditions those are less than those requires for maximum production. Shortage of
water i.e. water stress is a more limiting factor for crop production in the world than any other
single factor (Kozlowski, 1968). The northern region of Bangladesh suffers from scanty rainfall
specially during winter period’ Besides, with the rapidly increasing urban population,
competition between cities and agriculture for the limited supplies of surface and ground water
has increased. On the other hand, food productions in Bangladesh need to be increased in order
to meet the increasing demand for the fast growing population) For this, we have to increase
intensity of crop cultivation and it could be possible by introducing a third crop in the existing
cropping pattern. But this new crop must have short duration; should be drought tolerant and
have high nutritive value. The crop barley (Hordeum vulgare L.) possesses the above criteria.
Barley is one of those crops which suffers from water stress in the later period of growth season
and can tolerate stress condition than most other cereals of the world though the yield is low as
compared to other cereals (Innes and Blakwell, 1981). | en_US |
| dc.description.abstract | An experiment was conducted to study the performance of BARI barley-6 in different sowing
dates under irrigated and rainfed conditions during the rabi season of 2006-2007, at the Research
Field and Laboratory of Department of Crop Physiology and Ecology, Hajee Mohammad
Danesh Science and Technology University, Dinajpur. Four sowing dates (viz. November 1, 15,
29 and December 13) and two irrigation regimes (viz. no irrigation and three irrigations at
tillering, early booting and heading stages of growth) were included as experimental treatments.
The experiment was laid out in a Randomized Complete Block Design (RCBD) with three
replications. The results of the present investigation indicate that sowing date had significant
effect on physiological responses, dry matter partitioning, growth attributes, biochemical
parameters, yield and yield components. November 15 sowing had positive effect on the crop
leading to good physiological responses, greater accumulation of dry matter in stem, leaf and
spike, higher growth attributes and higher yield and yield components in almost all cases, which
were statistically alike with November 29 sowing. Higher RLWC, MRC, chlorophyll content,
plant height and 1000- grain weight were recorded in November 1 sowing which was at par with
November 15 sowing. On the other hand, late sowing resulted in weak physiological responses
and decreased yield but showed highest accumulation of proline. The present investigation also
indicated that LAI, LAD, TDM, CGR, RGR and NAR were increased due to irrigation at all the
growth stages. Greater accumulation of dry matter in stem, leaf and spike was also noticed in the
irrigated plants. Irrigation increased plant height, number of tiller plant’! and number of leaf
plant’! at almost all the growth stages. The number of days for achievement of different
phenological stages increased due to irrigation. Irrigated plant had higher MRC, RLWC and
chlorophyll content but lower amount of proline content. Irrigation increased yield and almost all
yield components such as number of fertile tiller plant’, extrusion length, spike length, number
of fertile spikelets spike’! and 1000-grain weight. Interaction effect of November 15 sowing with
well irrigated condition and November 29 sowing with well irrigated condition were found
suitable for better yield performance of barley. Barley crop showed lowest yield performance in
case of December 13 sowing with non-irrigated condition through the production of lowest
number of fertile tiller plant’, lowest number of fertile spikelets plant’ and lower 1000-grain
weight. | en_US |
