EFFECT OF DIFFERENT LEVELS OF BLACK POINTED SEED ON HEALTHY WHEAT SEED PRODUCTION
Date
2007-06
Authors
Journal Title
Journal ISSN
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Publisher
HAJEE MOHAMMOD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR
Abstract
Effects of different levels of black pointed seed on healthy wheat seed production
were studied in the field and laboratory during 2006-2007. The treatments considered
the levels of black pointed seed were Ty = Best seed treated with Vitavax-200 @
0.25% of seed weight, T; = Seed sample containing 5% of black pointed seed, T, =
Seed sample containing 7% of black pointed seed, T; = Seed sample containing 12%
of black pointed seed, T, = Seed sample containing 18% of black pointed seed, T; =
Seed sample containing 25% of black pointed seed and T, = Seed sample containing
35% of black pointed seed. The maximum (246.64 — 268.68) emergence of seedlings /
m’ was recorded in To and the minimum (182.58 — 190.75) was in T¢ after 7 and 15
days of sowing indicating general tendency of decreasing seedlings emergence with
the maximum use of black pointed seed. Percent leaf area infection (%LAI) of flag
leaf and flag leaf-1 were increased with increasing the age of plant. The maximum and
minimum Area Under Disease Progress Curve (AUDPC) of flag leaf and flag leaf-1
were recorded in Ts and T3, To, respectively. Maximum number of total seeds (35.05),
apparently healthy seeds (34.15) and the best seed (31.37) per spike observed when
the disease free best seed were sown in field. Number of black pointed seed (3.74) and
under sized seed (4.89) per spike were maximum in treatment T,. Highest seed yield
(4.02 t/ha) and 1000 grain weight (46.38 g) obtain from the treatment Tp and lowest
(3.11 t/ha, 43.97 g) in Ts. Fungi associated with harvested seed and their prevalence
were Bipolaris sorokiniana (6.5 - 80.0%), Alternaria spp. (1.5 - 31.0%), Fusarium
spp.(3.25 - 29.0%), Curvularia spp. (2.25 - 27.0%), Aspergillus spp.(3.0 - 24.0%) and
Epicocum spp. (1.75 - 30.0%) respectively.
Description
Wheat (Triticum aestivum L.) is the second staple cereal crop next to rice in
Bangladesh. Wheat grain is rich in food value containing in an average of 12.1%
protein which can go upto 21.1% (Rahman ef at., 1985). Since, initiation of high
yielding variety (HY V) of wheat expansion program in 1974, the area as well as yield
has increased manifold (Ahmed & Meisner, 1996). It covers almost 1379900 acres of
land with a total production of 975985 metric tons (BBS, 2005). Though the area,
production and yield rate of wheat have been increasing dramatically during the last
decade, the wheat yield in Bangladesh is too low (1.74 t/ha, BBS 2005) in comparison
to the developed countries of the world like Japan, India, China, South Korea, Mexico,
USA, EU-15 and Australia 3.17, 3.30, 3.90, 5.00, 4.44, 2.70, 6.36, 1.88, t/ha,
respectively (Economic Research Service, 2007).
Keywords
Treatments, Field Study, Application of Fertilizers and Manures, Experimental Design, Field Study