Sorghum vulgare like any other rainy season crop is badly infested with a variety of annual weeds on heavy soils of Udaipur and around. Many fields however are additionally infested with Cynodon dactylon... While a herbi-cidal cum cultural practice using atrazine has been worked out for control of annual weeds in sorghum (Gupta and Singh, 1967), work on control of weeds in doob infested sorghum fields needed attention. The present paper provides results of a weed control trial conducted in such a situation during 1967. It comprised three pre-emergence treatments viz, simazine at 0, 0.25 and 0.50 kg a. i./ha, and six post-emergence treatments viz, hand weeding, hoeing, hand weeding+hoeing and atrazinė at 0, 0.5 and 1.0 kg/ha. These 18 treatment combinations along with one earlier recommended herbicide treatment i. e. pre+post-emergence 2, 4-D (Na salt) at 1.0 kg a. i./ha were tried in a randomized-block design with 4 replications and net plot size of 40 sq m. Hybrid sorghum CSH1 was planted on July 18th. Pre and post-emergence treatments were applied one and 30 days after planting respectively. Crop was grown using recommended agronomic practices. During milk stage, sorghum was severely infested with Helminthosporium which greatly reduced its grain yield. The infestion being late, its stover production was not much. affected. Soil of the site was clay loam of pH 8-8.4 and 2.1% active organic matter.
Saroha et al. (Thu,) studied this question.