S.A. Abu Elela*, W.M. Elsayed
- Entomology Department, Faculty of Science, Cairo University, Giza, Egypt
A Large number of insects are influenced easily by a number of pollutants; such as cadmium (Cd) and lead (Pb). Cadmium has an increasing international concern because its toxicity is generally considered to be much higher than those of other heavy metals. In this research, we tried to evaluate the effects of both cadmium and lead on the larval and pupal durations together with adult longevity. From the obtained results, we found that cadmium (Cd) treatment disturbed larval development, metamorphosis and decreased the survival of both larvae and pupae. The mean total percentage survival of the larvae fed castor bean leaves treated with cadmium was significantly lower than that of the control and the lead treatments. It was observed that, percentage pupation was successful under lead treatment (93% percentage pupation) and the percentage larval survival recorded the highest value (94%) compared with those of the control and cadmium treatments. Our research assumed that lead does not affect the growth parameters of the insect.
Bahareh Eskandari1*, Mahdi Samavati2, Elahe Naderi Peikam3
- Department of Plant Science, Payame Nour University, Bahar Branch, Hamedan, Iran
- Departmentof Soil and Water, Payame Nour University, Bahar Branch, Hamedan, Iran
- Department of Soil and Water Payame Nour University, Bahar Branch, Hamedan, Iran
This research was performed with the purpose of evaluating 4 methods of extraction of absorbable phosphorus and to determine the appropriate extractant for estimation of absorbable soil phosphorus in 15 samples of soil. The physical and chemical characteristics of soils were determined using prevalent experimental methods. Pot plantation was performed in the form of factorial experimentation in the framework of a completely random project in 9 sample of soil with two levels of phosphorus (zero and 150 milligrams per Kg soil) with three repetitions and plant indices including: absorbed phosphorus and relative performance were measured. Evaluation of the results of the correlation coefficient between various extractants and relative performance, concentration and absorption of phosphorus by the maize plant shows that Olsen extractants have meaningful correlation with relative performance, phosphorus absorption and Mehlich 3 extractants with relative performance. Yet, regarding Bray and AB-DTPA extractants meaningful correlation with relative performance and concentration of absorbed phosphorus was not found.