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Abstract
Acephate was applied to greenhouse tomatoes (Lycopersicon esculentum Mill.) as single and multiple applications, and residues on the fruits were determined several times after treatment. Immediately after application, residues of acephate averaged 0.46, 0.83, and 1.81 ppm for plots receiving 0.56, 1.12, and 2.24 kg/930 liter solutions, respectively. By day 7 residues of acephate, averaged over all rates, were 5.4% of day 0 values. Residues of methamidophos, a metabolite of acephate, were detected in all samples except those for day 0, but differences between rates and days after application were not significant. A statistical comparison of residue data showed that total residues (acephate plus methamidophos) were significantly greater after spraying once a week for 4 weeks than after a single application.
Abstract
Staked tomatoes (Lycopersicon esculentum Mill) grown in 8 soil management systems are compared for differences in marketable yields, gross revenues, treatment costs, and net economic values. Maximum marketable yields were obtained using a fumigant and straw mulch combinatory practice, but the highest net economic value (gross revenues less treatment costs) was realized by a fumigant and herbicide ground management practice. These data suggest that the use of mulch materials and/or herbicides increased yields and net returns over standard cultivation practices.