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SEQUENTIAL APPLICATION OF HERBICIDES FOR WEED MANAGEMENT IN RABI SUNFLOWER (Helianthus annuus L.)

KrishiKosh

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Title SEQUENTIAL APPLICATION OF HERBICIDES FOR WEED MANAGEMENT IN RABI SUNFLOWER (Helianthus annuus L.)
 
Creator SIVA SANKAR, K
 
Contributor SUBRAMANYAM, D
 
Subject weeds, control methods, drying, sowing, yields, developmental stages, herbicides, crops, grasses, harvesting
Helianthus annuus L.
 
Description A field experiment was conducted at S.V. Agricultural College Farm, Tirupati campus of Acharya N.G. Ranga Agricultural University of Andhra Pradesh, during rabi, 2010, to identify the suitable pre-and post-emergence herbicides for the management of weeds in sunflower.
The present investigation was laid out in a randomized block design with three replications. There were ten treatments viz., pre-emergence application of pendimethalin @ 1000 g a.i ha-1 (T1), pre-emergence application of oxadiargyl @ 250 g a.i ha-1 (T2), pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + fenoxaprop @ 60 g a.i ha-1 at 20 DAS (T3), pre-emergence application of oxadiargyl @ 250 g a.i ha-1 + fenoxaprop @ 60 g a.i ha-1 at 20 DAS (T4), pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 at 20 DAS (T5), pre-emergence application of oxadiargyl @ 250 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 at 20 DAS (T6), pre-emergence application pendimethalin @ 1000 g a.i ha-1 + quizalofop @ 50 g a.i ha-1 at 20 DAS (T7), pre-emergence application of oxadiargyl @ 250 g a.i ha-1 + quizalofop @ 50 g a.i ha-1 at 20 DAS (T8), two hand weedings at 20 and 40 DAS (T9) and un-weeded check (T10).
Weed species belonging to eight taxonomic families were observed in the experimental field, of which seven species were grasses, two species were sedges and nine species were broad leaved weeds.
Among the weed management practices tried, two hand weedings at 20 and 40 DAS resulted in significantly lesser density and dry weight of total
xv
weeds with higher weed control efficiency. Pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 applied at 20 DAS was the next best weed management practice, followed by pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + quizalofop @ 50 g a.i ha-1 applied at 20 DAS. The highest values of the above mentioned weed parameters with the lowest weed control efficiency were recorded with unweeded check, followed by pre-emergence application of oxadiargyl alone.
Pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 applied at 20 DAS resulted in significantly higher stature of growth parameters viz., plant height, LAI, dry matter production and yield components viz., head diameter, total number of seeds and filled seeds head-1 and test weight followed by hand weeding twice at 20 and 40 DAS.
The highest seed, stalk and oil yield of sunflower along with harvest index were recorded with pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 applied at 20 DAS followed by two hand weedings at 20 and 40 DAS.
The highest gross and net returns were realized with pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 applied at 20 DAS, followed by two hand weedings at 20 and 40 DAS. However, the highest benefit-cost ratio was registered with pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1or quizalofop @ 50 g a.i ha-1 applied at 20 DAS.
Thus, the present study has revealed that pre-emergence application of pendimethalin @ 1000 g a.i ha-1 + propaquizafop @ 60 g a.i ha-1 applied at 20 DAS resulted in the highest seed yield and maximum economic returns, followed by two hand weedings at 20 and 40 DAS. Out of these two weed management practices, the choice of selection should be based on the time of weeding, availability and cost of labour.
 
Date 2016-06-04T14:01:08Z
2016-06-04T14:01:08Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66777
 
Language en
 
Relation D8993;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY