Abstract
Abstract In Hamoul in the Nile Delta, where barnyard grass was the prevalent weed, two field trials of 12 herbicides were carried out in transplanted rice (cultivar; G12a 170). In the 1972 season granular herbicides were shown to be significantly superior to liquid formulations. In 1973 an improved technique was investigated, broadcasting herbicide/gypsum mixture by hand onto flood water. This type of application was successfully extended to some 7,000 feddans during the 1973 and 1974 seasons with the use of molinate/gypsum mixture. All herbicidal applications seemed significantly superior to hand-weeding once. Among all the tested herbicides, molinate was found to be the most beneficial, since it increased the rice grain yield by 62.5% and 108.0% over one hand-weeding and the control respectively.
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