Abstract:
The experiment was conducted at the experimental site of Sher-e-Bangla
Agricultural University (SAU) during the period from December, 2007
to
March, 2008 to study the growth and yield of wheat as influenced by
time of irrigation and split application of nitrogen
. The treatments
comprised (A) three irrigation levels (i) no irrigation, (ii) one irrigation given at
crown root initiation stage, (iii) two irrigations, one at crown root initiation
stage and another at panicle initiation stage and (B) four split application of
nitrogen viz. (i) no nitrogen application, (ii) one basal application of nitrogen at
the time of sowing, (iii) two equal split- one at basal and another at 30 DAS,
(iv) three equal split- one at basal, one at 30 DAS and the other at 60 DAS and
(C) their combination effect. It was observed that the highest plant height,
number of tillers/plant, leaf area index (LAI), fresh weight plant
, dry weight
plant
-1
, spike length, number of spikelets spike
-1
-1
, number of grains spike
, 1000
seed weight, total grain yield, straw yield and harvest index were obtained with
the application of irrigation and nitrogen. In case of the combined effect on
irrigation and split application of nitrogen, the tallest plant (96.37 cm), highest
number of tillers/plant (4.50), highest leaf area index (2.71), highest fresh
weight (66.97g) and dry weight (36.56g) plant
-1
, longest spike length (17.35
cm), highest number of spikelets spike
-1
(60.00) and highest number of grains
spike
-1
1
(39.33), highest 1000 seed weight (48.50g), total grain yield (4.30 t ha
), straw yield (5.82 t ha
-1
) and harvest index (42.49%) were obtained with the
combination of two irrigations with three split application of nitrogen. So, it
may be concluded that the treatment combination of two irrigations at crown
root initiation and panicle initiation with three splits of nitrogen one each at
basal, 30 DAS and 60 DAS considered as the best treatment compared to all
other treatments and it can be recommended for further trial.
