Corn (Zea maysL.) was grown in EPTC-(S-ethyl dipropylthiocarbamate) and butylate-(S-ethyl diisobutylthiocarbamate) treated soil at 33 and 15% moisture in growth chambers at 30 and 20 C. EPTC (6 and 18 ppm) and butylate (19 and 50 ppm) reduced corn growth more at 30 than at 20 C. The days before emergence of the corn coleoptile were the most critical time for thiocarbamate injury. When plants were grown at 30 C before emergence more injury occurred at 33% soil moisture than at 15% except with butylate at 19 ppm. At 20 C, however, plants grew as tall or taller at 33% soil moisture than at 15% except for butylate at 19 ppm. Addition of R-25788 (N,N-diallyl-2,2-dichloroacetamide) to EPTC and butylate increased by about 10 times the amount of herbicide required to injure corn. With R-25788 the toxicity of these two herbicides was not influenced greatly by either temperature or soil moisture.

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This study examined farmers' assessment of extension services in Ogun State, Nigeria. One hundred and twenty respondents were randomly selected and an interview schedule was used to collect data. Frequency distribution, percentages, chi-square, and Pearson Product Moment Correlation were used to analyze the data. The results revealed that more than half of the farmers (55%) fall within the age range of 40-59, most are female (66.7%), 70% have some level of formal education, and the majority (80%) had more than 10 years of experience with more than one farm location. A high percentage (90.0%) had frequent contact with extension agents, but less than half (49.2%) acknowledged extension services to be effective. Extension agents should be equipped with necessary materials and training in order to improve their services.

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