A herbicide safener, CGA-43089 [α-(cyanomethoximino)-benzacetonitrile], has been discovered which will allow the safe use of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethylacetamide] in grain sorghum [Sorghum bicolor(L.) Moench]. Experiments revealed that sorghum is protected from injury by metolachlor when it is applied at rates as high as 4 kg/ha. Better protection was achieved when sorghum seed were treated directly with the safener than when it was mixed with the herbicide. A CGA-43089 rate of 1.25 to 1.5 g per kg of sorghum seed was adequate for protection. Sorghum tolerance to metolachlor was maintained with CGA-43089 when metolachlor was combined with severals-triazine herbicides. Metolachlor effectively controlled several annual grasses with an increase in sorghum yield.
Synopsis
Irrigation was effective in increasing total forage production in 1957 but not in 1958. In both years, however, irrigation prior to the first harvest did not increase yields. Deep fertilization was ineffective in increasing forage production. Alfalfa, alone and with orchardgrass, was the only species whose root yield was increased by deep fertilization. Alfalfa, alone and with orchardgrass, made the best use of available subsoil moisture; orchardgrass made the least use of this moisture.
There are many "soil" terms commonly used by weed scientists as we go about our work each day. Memos, letters, written reports, articles for publication in Weed Science, and oral presentations are just a few examples. Many have found some soil terms mean different things to different people; sometimes terms are not correctly used. The Soils Terminology Subcommittee was asked to compile a list of soil terms which are most often used by weed scientists, and provide definitions for these terms. The goal, of course, was to provide some standardization in the use of these terms. Using the Soil Science Society of America, "Glossary of Soil Science Terms" as a reference, the Subcommittee compiled the following list of soil terms. We hope the membership finds them useful.
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