[Response of potatoes (Solanum tuberosum) and weeds to some herbicides]
1989
Habib, S.A. | Al-Suonbil, A.A. | Ibadi, K.W. | George, I.
Two field experiments were conducted at the Agricultural and Water Resources Research Center Station during the spring growing season of 1985 and 1986 to determine the response of potatoes (Solanum tuberosum L.) and weeds to several herbicides applied singly or as mixture under the cultural conditions in the central region of Iraq. The herbicides were: Metribuzin, metobromuron, metolachlor, EPTC and DCPA. Results indicated that the use of metribuzin, either, as pre-emergence or post-emergence at an application rate of 0.75 kg a.i./ha and metobromuron at 1.5 kg a.i./ha, pre-emergence, were effective in controlling weeds and increasing potato tubers yield significantly. Pre-emergence application of metolachlor and metobromuron mixtures at rates of 2, 2.5 and 3 kg a.i./ha did not increase the tubers yield although they were effective in removing all weeds, as they caused some injury to potato plants represented by lowering plant height and decreasing foliage dry weights. The herbicide EPTC was not effective in controlling weeds and increasing potato yield when used alone. However, early post-emergence application of DCPA after EPTC improved weeds control and increased tubers yield. Long-season competition of weeds with potatoes caused an averages of reduction ranged between 43.6 and 35.6% in tubers yield in 1985 and 1986, respectively
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