Effect of some sources of pollution on tomato plants. I-Growth analyses, yield and anatomy | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 4, Issue 2, December 1992, Pages 1-24 PDF (8.62 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1992.462272 | ||
| Authors | ||
| Ansary E. Moftah* ; Ahmed A. Gendy; Abd El-Halim M. Eid | ||
| Dept. of Agricultural Botany, Faculty of Agric., Moneafia University, Shebin El-Kom, Egypt. | ||
| Abstract | ||
| The effects of lead (0, 50, 100 and 200 ppm), dimethoate (0.0, 0.2, 0.4 and 0.8%) and sulfuric acid (0.0, 0.02, 0.04 and 0.08 N) on the growth, yield and anatomy of tomato plants were investigated. Results showed that 200 ppm of lead decreased plant heights, root length, leaf area and the dry weight of plant organs. The high levels of lead decreased the leaf area index (LAI), the specific leaf weight (SLW) and the leaf area ratio (LAR) but the specific leaf area (SLA) was increased. Foliar spray method was more effective in causing harmful effects on the net (NAR), the relative growth rate (RGR), the relative leaf area growth rate (RLGR) and other growth parameters than soil application method. Lead treated-plants flowered earlier than untreated control, but fruit yield was decreased significantly even at 100 ppm. Lead caused a decrease in the area and thickness of xylem tissues in stem. The high levels of dimethoate caused nearly a complete cessation in plant growth. LAI and SLW were decreased, while LAR and SLA were increased with dimethoate treatments. In addition, NAR, RGR and RLGR were negatively affected. The medium and high levels of dimethoate prevented flowering and fruit production. Dimethoate reduced the area of the parenchyma tissues such as cortex and pith. Sulfuric acid caused a significant reduction in all growth parameters. The dry weights of leaves, stem and roots were reduced by all tested H₂SO₄ concentrations, at 75 days of transplanting. The effect on growth analyses was similar to that resulted from dimethoate. Soil treatment was more harmful to affect growth parameters than foliar spray. The soil application of H₂SO₄ caused an early flowering, while the foliar application delayed it. The fruit yield was decreased significantly by all acid concentrations. The high levels of H₂SO₄ ceased flowering and fruiting. A complete destruction in cortex and pith cells was observed under the high acid-levels. | ||
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