Abstract:
The study was carried out at the research fleld of Sher-e- Bangla Agricultural
University, Dhaka during 31 March 2007 to 8 June 2007 to evaluate the effect
time of weeding and spacing on the yield perlbrmance of blackgram. The
treatment comprised of three levels of weeding viz, no weeding, one weeding
at 25 DAS and two weedings at 25 and 40 DAS. and four types ol spacings viz.
30cm
x7
cm, 30cm
x
10 cm, 30cm
x
13 cm and 30cm
x
16 cm. The experiment
was laid out in a randomized complete block design factorial. Two times of
weeding. (at 25 and 40 DAS) increased grain yield with higher values of
harvest index as the crop characters like plant height, branches plant". number
olleatlets plant", number of flowers plant", number of pods plant", seeds pod
-
dry weight plani', yield plant" and 1000 seed weight were higher. The seed
yield with two weeding was 56.18% and 25.23% higher than no weeding and
one weeding respectively. The spacing, 30cm
x
10 cm showed its superiority by
producing 7.96%, 8.92% and 16.19% higher yield than 30cm
cm and 30cm xl6 eni spacing, respectively. The 30cm
x
x
7 cm. 30cm
10 cm spacing also
showed higher biological yield and harvest index. Interaction of two weeding
with 30cm
xl
0 cm spacing performed best in respect of seed yield (1.58 t ha').
