Padhy R N
Postgraduate Department of Botany, Khallikote College, Berhampur, Orissa, India.
Microbios. 2001;106(415):165-75.
The effects of individual chemical fertilizers (urea, superphosphate and potash) on the toxicity of two carbamate insecticides (carbaryl and carbofuran) to the nitrogen-fixing cyanobacterium Anabaena PCC 7120, were studied in vitro at partial lethal levels of each insecticide. Urea at 10 and 50 ppm levels reduced the toxicity due to carbaryl at 50 ppm partial lethal dose and due to carbofuran at 100 and 250 ppm partial lethal doses. Urea at 100 ppm enchanced the toxicity of both insecticides. Superphosphate at 10 ppm reduced the toxicity of carbaryl at 50 ppm and carbofuran at 100 and 250 ppm, but it enhanced the toxicity due to both insecticides at 50 ppm superphosphate. The toxicity due to carbaryl at 40 and 60 ppm were reduced by 100 and 200 ppm potash, but higher potash levels caused enhancement of toxicity. Carbofuran toxicity at 100 ppm was reduced but at 250 ppm the toxicity was enhanced with 100 ppm potash. Urea, superphosphate and potash caused no significant change in number of vegetative cells between the successive heterocysts at 10 and 50 ppm of urea and superphosphate, respectively, and 100 ppm of potash.
在体外，分别以两种氨基甲酸酯类杀虫剂（西维因和呋喃丹）各自的部分致死剂量，研究了单一化学肥料（尿素、过磷酸钙和钾肥）对固氮蓝藻鱼腥藻PCC 7120的毒性影响。10 ppm和50 ppm的尿素降低了50 ppm部分致死剂量的西维因以及100 ppm和250 ppm部分致死剂量的呋喃丹的毒性。100 ppm的尿素增强了两种杀虫剂的毒性。10 ppm的过磷酸钙降低了50 ppm西维因以及100 ppm和250 ppm呋喃丹的毒性，但在50 ppm过磷酸钙时增强了两种杀虫剂的毒性。100 ppm和200 ppm的钾肥降低了40 ppm和60 ppm西维因的毒性，但更高的钾肥水平导致毒性增强。100 ppm钾肥降低了100 ppm呋喃丹的毒性，但在250 ppm呋喃丹时增强了毒性。分别在10 ppm和50 ppm的尿素以及100 ppm的过磷酸钙和钾肥条件下，连续异形胞之间的营养细胞数量没有因尿素、过磷酸钙和钾肥而发生显著变化。
