Efficacy of herbicides and herbicide combinations at sorghum (Sorghum bicolor Moench.)

GROZI DELCHEV1 and TEODORA BARAKOVA2
1 Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
2 Field Crops Institute, 6200, Chirpan, Bulgaria

Abstract

DELCHEV, G., and T. BARAKOVA, 2018. Efficacy of herbicides and herbicide combinations at sorghum (Sorghum bicolor Moench.). Bulg. J. Agric. Sci., 24 (Suppl. 1): 33–39

In the period 2012-2014 a field experiment was carried out with sorghum hybrid Arcansiel (Sorghum bicolor Moench.). A total of 4 soil-applied herbicides were tested - Tender EC (S-metholachlor), Silba SC (S-metholachlor + terbuthylazine), Sharpen 33 EC (pendimethalin) and Wing P (dimethenamid + pendimethalin) and 4 vegetation-applied herbicides - Casper 55 WG (prosulfuron + dicamba), Cambio SL (bentazone + dicamba), Camix 560 SE (S-metholachlor + mesotrione) and Maton 600 EK (2.4-D ester). In all variants seeds were treated with the herbicide antidote Concep III (fluxofenin) to protect sorghum from the phytotoxic effect of antigraminaceous herbicides. Soil-applied herbicides Tender, Silba, Sharpen and Wing have high efficacy against annual weeds in grain sorghum grown by Concep technology. Vegetation-applied herbicides Casper, Cambio and Maton have very high efficacy against all broadleaved weeds. Herbicide Camix is the only vegetation-applied herbicide, which can control secondary weeding of annual graminaceous weeds in sorghum which seeds are treated with herbicide antidote Concep III. The combinations between soil-applied and vegetation-applied herbicides control successfully all groups of weeds with the exception of perennial graminaceous weeds from rhizomes. Herbicide Camix causes poor phytotoxicity in sorghum plants. Use of herbicide combinations Silba + Casper and Wing + Cambio result in obtaining high grain yields of sorghum. High grain yields are also obtained through the use of herbicide combinations Silba + Cambio, Sharpen + Cambio, Tender + Casper and Wing + Casper. Combining Camix and Maton with soil-applied herbicides leads to lower grain yields.

Keywords: grain sorghum; herbicides; herbicide combinations; selectivity; stability; grain yield

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