Studies on biology and management of Coronopus didymus and Melilotus indicus
Loading...
Date
2019
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
Coronopus didymus and Melilotus indicus are troublesome weeds in winter season crops. The
study entitled “Studies on biology and management of Coronopus didymus and Melilotus indicus” was
carried in College of Agriculture, CCS Haryana Agricultural University, Hisar, during Rabi season of
2015-16 and 2016-17. The experiments to study the effect of temperature, osmotic stress, light, pH and
salt stress on germination of C. didymus and M. indicus were conducted in laboratory (Department of
Seed Science and Technology), while experiments to study the effect of seeding depth, flooding,
mulching and herbicidal treatments on seedling emergence and management of C. didymus and M.
indicus were carried out in green house (Department of Agronomy). All the experiments were
conducted in completely randomized design with each treatment replicated four times.Based
on research results it was found that the optimum temperature range for germination and better growth
of C. didymus and M. indicus was 15-30oC day temperature and 10-20oC night temperature, whereas,
C. didymus completely failed to germinate at 45/35oC. The germination and growth of C. didymus was
more sensitive to increasing salt and moisture stress compared to M. indicus. M. indicus even
germinated at 75 mM NaCl conc. (78%) and -1.0 MPa osmotic potential (45%), whereas, C. didymus
did not germinate at this concentration of NaCl and osmotic potential. The optimum pH for
germination of C. didymus was pH 5; however, for M. indicus it was pH 7. Both weeds were nonphotoblastic
in nature, as dark and light period had no significant effect on germination of both weeds.
The optimum burial depth for seedling emergence and better growth of C. didymus was found to be 0.5
cm and for M. indicus it was 1 cm. Continuous flooding for 32 days favored the emergence of C.
didymus, however, M. indicus was sensitive to water submergence and did not emerge after 32 days
continuous flooding. Rice straw mulching @ 10 t/ha provided complete control of C. didymus, but,
only reduced emergence and growth of M. indicus as compared to no mulching/control.
Although, post emergence application of imazethapyr (100 g/ha) and ready mix of imazethapyr +
imazamox (70 g/ha) provided good control of both weeds, when sprayed at 3-4 weeks old seedling,
while, pre-emergence application of pendimethalin, imazethapyr and RM of imazethapyr + imazamox
were more effective against C. didymus and M. indicus.
Description
Keywords
null