Abstract
It has been rumored that soils around schools in the US are contaminated with lead, which is known to be harmful to children, and is known to inhibit plant growth. The purpose of this study is to investigate the growth of plants in soil sampled from US schools to see if decreased plant growth can indicate lead contamination before testing is done. After comparing the time until germination, height, and root length of radishes grown in soil from the surrounding area of the school to that of those grown in uncontaminated soil, we found that radishes grown in soil from schools germinated at a rate 38% slower than radishes grown in uncontaminated soil (HR = 0.62, 95% CI 0.33-1.2, Ptrend = 0.13). The mean radish heights between the two groups were also found to be significantly different (p = 0.12). Decreased plant growth may serve as an indicator for soil contamination before other laboratory tests are done. It is recommended that further testing for lead and other toxins should be conducted on the soil of the surrounding area, and larger studies with multiple species of plants should be conducted to see if these trends could be applied to the general plant population around schools.
 Int. J. Agril. Res. Innov. Tech. 10(1): 94-96, June 2020
Highlights
Soil contaminated with lead from leaded gasolines untested soil can be used as an indicator of soil has been an ongoing public and environmental contamination.health problem in all industrialized countries who have used cars with internal combustion engines Materials and Methods until around the 1990s (Laidlaw et al, 2012)
Three radish seeds were planted in each cell hairs, previous studies have only investigated the methods plants use to mitigate lead toxicity, not how such toxicity affects plant growth
Hazard models for how the contaminated soil Results affects seed germination compared to seed germination in the uncontaminated soil over The final Cox proportional-hazard model (Figure time. 2-sample t-intervals were calculated for 1) demonstrates that the radishes grown in lead the relationships between soil contamination and contaminated soil germinated at a rate 38%
Summary
Soil contaminated with lead from leaded gasolines untested soil can be used as an indicator of soil has been an ongoing public and environmental contamination. 2-sample t-intervals were calculated for 1) demonstrates that the radishes grown in lead the relationships between soil contamination and contaminated soil germinated at a rate 38%. The following measurements: germination time, slower than radishes grown in uncontaminated height in cm measured 3 days from germination, soil (HR = 0.62, 95% CI 0.33-1.2, Ptrend = 0.13). Root length measured 5 days after When controlling for the presence of lead in soil, germination. Two-sample t-tests (Table 1) interpreting p-values as the results, instead of revealed significant differences in the germination serving as an estimate of the population, should times and radish heights between the two groups only elucidate the need for larger, future studies (p = 0.15 and 0.12, respectively), but no testing plant health in the soil around CHSN. Data is confidence intervals are plotted over a period of 3 right censored as some seeds did not germinate. days
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