Effect of Chlorsulfuron +2, 4-D, nitrogen and their combinations on Striga hermonthica (Del.) Benth incidence and Sorghum performance
Gasim A Adam, Abbasher A Abbasher, Abdel Gabar A Babekir, Mohamed S Zaroug, Adil EA Bala
A series of experiments were conducted during two seasons to study the efficacy and selectivity of the herbicide Chlorsulfuron in tank mixtures with 2,4-D for Striga control in sorghum. Application of the nitrogen fertilizer, as urea, was also evaluated as a separate treatments or in combination with the herbicide mixtures. The experiments were conducted at two sites in the Gezira State, Sudan. Application of N, as urea, had slight effects on Striga emergence at 60 days after sowing. At 90 DAS, urea at 80 kgfed-1 reduced Striga emergence by up to 37%. Chlorsulfuron +24-D reduced Striga emergence by 41%-59% and 37%-67% in the 1st and 2nd seasons 90 DAS, respectively. Combining urea at 80 kg fed.-1 with the tank mixture of Chlorsulfuron + 2,4-D at the rates tested gave 61%-73%, and 56-72% reduction in Striga density in the 1st and 2nd seasons 90 DAS, respectively. The benefits of adding nitrogen was clearly reflected by sizable reduction in dry weight obtained. Where the combined application of nitrogen with the herbicide mixture of Chlorsulfuron + 2,4-D at the rates tested gave 41%-65% and 52%-74% reduction in Striga dry weight in the 1st and 2nd seasons, respectively. Whereas the sole treatment of herbicide mixture gave 19%-30% and 32%-40% reduction in Striga dry weight in the 1st and 2nd seasons, respectively. The corresponding reduction in Striga dry weight due to sole nitrogen application was 15%-39% in the two seasons. In conclusion, the application of Urea, herbicides and their combinations reduced Striga population and slightly increased sorghum grain and straw yields.