Effect of Dose and Oxadiargyl Application Time at the Different Growth Stages on Weed Biomass and Tuber Yield of Potato (Solanum tuberosum L.)

Subject Areas : Journal of Crop Ecophysiology

E. Samadi Kalkhoran ¹ ( M.Sc. of Weed Science, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran )
M.T. Alebrahim ² ( Assistant Prof. of Weed Science, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran )

Received: 2015-04-29 Accepted : 2015-11-11 Published : 2015-12-22

Keywords: Weed Biomass, Dose - response, Oxadiargyl, Total tuber yield,

Abstract :

To evaluate the effects of dose and application time of oxadiargyl, as a postemergence herbicide, on weed biomass and tuber yield of potato, a factorial experiment based on randomized complete block design with 3 replications was conducted at Alaroog Research Station at the University of Mohaghegh-Ardabili in 2013. Treatments consisted of oxadiargyl dosages (0, 0.05, 0.1, 0.2, 0.4, 0.6 and 0.8 lit a.i /ha), and its time of applications at different potato growth stages (potato emergence, stolon initiation and potato tuber bulking), weed free treatment was considered as control. Statistical analysis showed that 0.8 lit a.i/ha of oxadiargyl reduced biomass of weed by 66.16 percent. Oxadiargyl application at emergence time resulted in highest percent reduction of weed biomass. Results, also, showed that application 0.8 lit a.i/ha of oxadiargyl, after weed free condition, increased number of seed tuber and total tuber yield by 82.16 and 51.59 percent respectively, but it reduced number of non seed tuber by 43.17 percent. Application of oxadiargyl at emergence time, as compared with the other application times, resulted in highest increase in the number of seed tuber and total tuber yield, but it did not affected number of non seed tubers. Interaction effect of dose by time of oxadiargyl application revealed that using 0.8 lit a.i/ha dose at potato emergence time increased number of edible tubers by 100%. It may be conducted that application of this dose at potato emergence time was highly efficient in controlling weeds and increasing potato tuber yield.

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