Variability distribution of residual pesticide concentrations in soil | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 4, Issue 1, June 1992, Pages 71-84 PDF (3.48 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1992.462135 | ||
| Authors | ||
| Zeinab Shaaban* 1; Adel M. Elprince2 | ||
| 1Plant Protection Research Station, Agricultural Research Center, Ministry of Agriculture, Sabaheia, Alexandria, Egypt. | ||
| 2Department of Aridland Agriculture, Kuwait Institute for Scientific Research, Safat - Kuwait. | ||
| Abstract | ||
| The concentrations of 13 different pesticides (c) were measured in Torrifluvents soil samples (0–15 cm depth) covering an intensively cultivated 83,000 ha in the Nile delta, Egypt. Fractile diagrams indicated that the values of c were more accurately described as lognormally than normally distributed for all the 13 pesticides. The number of observations required to yield an estimate of the mean concentration within a prescribed accuracy was shown to depend upon the nature of the pesticide and extent of the spatial variability of the field soil. The wide range of sample sizes was such that 31 soil samples would be sufficient to estimate phenthonate while sample size of 1261 would be needed to estimate DDE within ±10% of the true mean at the 0.05 significance level. | ||
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