Studies on chemical weed control in berseem (Trifolium alexandrinum L.)
Loading...
Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
The present investigation entitled, “Studies on chemical weed control in berseem (Trifolium
alexandrinum L.) was conducted at Research Farm of Department of Agronomy, Chaudhary Charan
Singh Haryana Agricultural University, Hisar during winter (rabi) season of 2013-14 to find out
suitable herbicides for productivity enhancement by suppression of associated weeds like Coronopus
didymus L. along with other weed flora in berseem (Trifolium alexandrinum L.). Fifteen herbicide
combinations namely butachlor at 1000 and 1500 g/ha, pendimethalin at 750 and 1000 g/ha as PRE,
imazethapyr at 50, 75 and 100 g/ha as PPI, PRE and 3 WAS and oxadiargyl at 75 and 100 g/ha as PRE
were tested along with unweeded control (weedy check). All herbicide combinations along with weedy
check were tested in randomized block design replicated thrice in the plots measuring 5×4 m
2
. Among
herbicides, imazethapyr at 100 g/ha at 3 WAS scaled down the population of the entire weed flora
including their dry weight appreciably in comparison to other treatments, whereas, the effect of
pendimethalin against dominant weeds was not to the desirable level when applied at 750 and 1000
g/ha as PRE and caused phyto-toxicity on berseem plants. The application of imazethapyr at 100 g/ha
applied as post-emergence resulted in the increased yield attributes viz. plant height and number of
tillers as compared to the remaining herbicidal treatments as well as the weedy check. Significantly
higher green fodder yield (859.8 q/ha) and dry matter yield (117.0 q/ha) were obtained with the use of
imazethapyr at 100 g/ha as post-emergence than the other treatments except the lower doses of
imazethapyr i.e. 50 and 75 g/ha as post-emergence, where the differences were non-significant.
However, the quality parameters viz. crude protein content (%) and IVDMD (%) were not significantly
influenced by the various treatments. The crude protein yield (24.3 q/ha) and DDM yield (68.4 q/ha)
was significantly improved with the application of imazethapyr at 100 g/ha at 3 WAS over other
herbicidal treatments and weedy check. The highest net returns (Rs. 55971/ha) and B:C ratio (1.77) was
realized with the post-emergence application of imazethapyr at 100 g/ha.
Description
Keywords
Weeds, Control methods, Harvesting, Yields, Berseem, Crops, Herbicides, Drying, Dry matter, Diseases