EFFECT OF SOWING DATE AND IPRODIONE ON THE ALTERNARIA BLIGHT OF MUSTARD (Brassica juncea)
Date
2008-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR.
Abstract
A field study had been carried out during the period from October 2006 to
February 2007 at Syedpur in Nilphamari district to determine the effect of
sowing date and Iprodione in controlling the Alternaria blight of mustard cv.
Tori 7. The three sowing dates were 23 October (early), 07 November
(normal) and 22 November (late), 2006. Iprodione (0.25%) was applied
three times, viz. single spray, two sprays and three sprays at 10-days interval
starting from the first disease initiation on the lower older leaves of 30-40
days old plants. Control plots were sprayed with plain water. The
manipulation of early sowing date as non-monetary input decreased the leaf
area diseased, pod area diseased, number of pod infection, number of spot
per pod and increased 1000-seed weight, seed yield per plant and yield per
hectare over late sowing. Results obtained in this study indicated a
tremendous effect of sowing date on the disease severity and seed yield of
mustard. The application of three sprays of Iprodione provided the
maximum control of Alternaria blight and increased seed yield per hectare.
Iprodione three sprays in combination with early sowing (23 October)
displayed the best performance in controlling the Alternaria blight disease.
Three sprays of Iprodione (0.25%) or 23 October (early) sowing alone
significantly brought down the disease severity while in combination
reduced the disease significantly and increased seed yield by 28.42 % over
control (non-sprayed) of late sowing crop. Finally, it may be concluded that
Iprodione three sprays in combination with early sowing was found superior
for management of Alternaria blight of mustard oilseed crop.
Description
Mustard (Brassica juncea L,. 2n=4x=36) belonging to the family Cruciferae
is the most important oil seed crops in Bangladesh. Oilseed crop specially
mustard and rapeseed are widely cultivated throughout the world as
condiments, spices and for edible vegetable oil production. The amount of
edible oil from mustard seed does not meet the current requirements of the
140 millions people of Bangladesh. Most of the common people of this
country are traditionally fond of mustard oil. This country is in deficit of
about 90,000 metric tons of edible oil annually (Lutfor Rahman et a/., 1993)
. which is imported from other countries. About 2.17 lakh hectares land are
use in mustard cultivation. As an edible oil in Bangladesh, mustard hold the
second position next to soyabean. Mustard fleshy leaves are used as a very
popular green vegetable in the country. It contributes significantly to the
national economy of the country (Anon., 2006). Mustard shared 183
thousand tons, which constitutes 70 percent of the total edible oilseeds in
Bangladesh (Anon, 2006). As compared to the developed countries, the yield
of mustard is too low. The yield of this crop in Bangladesh is only 0.84 t/ha
(Anon, 2006) which is poor compared to that of advanced countries like
Japan, U.K., French and Poland producing 1.73, 3.43, 2.68 and 2.04 t/ha,
respectively.
Keywords
Effect of sowing dates, Effect of sowing dates and Iprodione, Land preparation and fertilizer application