Weed Research (2018) 58, 188-199

T.K. Das and D.K. Das (2018)
Using chemical seed dormancy breakers with herbicides for weed management in soyabean and wheat
Weed Research 58 (3), 188-199
Abstract: Variable dormancies result in periodicity in the germination of weeds and make weed control a repetitive practice. Under some conditions, repeated applications of selective herbicides can lead to the dominance of perennial weeds like Cyperus rotundus. Our hypothesis was that applying a chemical dormancy breaker (DB) plus herbicide mixture would better control a mixture of weed species. Three experiments were designed to develop a cost-effective DB treatment and to evaluate its dose with herbicides tank-mixtures for effective weed management. KNO₃ and gibberellic acid GA₃ as dormancy breakers offered comparable effects, but KNO₃ was more economical than GA₃. KNO₃ at a 6% concentration was more effective in promoting weed germination than a 3% concentration in soyabean. A combination of KNO₃ (6%) and pre-emergence pendimethalin 0.75 kg a.i. ha^-1 + imazethapyr 0.10 kg a.i. ha^-1 controlled annual weeds by 99% and reduced C. rotundus growth by 83%. This treatment gave significantly higher soyabean yield and net returns. Similarly, a tank-mixture comprising of clodinafop 0.06 kg a.i. ha^-1 + metsulfuron 0.006 kga.i. ha^-1 was more effective against weeds than pre-emergence tank-mix application of pendimethalin 0.75 kg a.i. ha^-1 + carfentrazone-ethyl 0.02 kg a.i. ha^-1 and isoproturon 0.75 kg a.i. ha^-1. The use of pre-emergence tank-mixture of pendimethalin 0.75 kg a.i. ha^-1 + imazethapyr 0.10 kg a.i. ha^-1 should exhaust seed/tuber bank if repeated and reduce the application cost of herbicides by 50% and the dose, residue and cost of pendimethalin by 25%.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Tapas K. Das

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cyperus rotundus (weed)