Dissipation of chlorpyrifos in red loam soil and its effect on soil organisms (Record no. 27455)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 02792nam a2200193Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20220318120944.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 140128s9999 xx 000 0 und d |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.4 |
| Item number | REK/DI |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Rekha P R |
| 245 ## - TITLE STATEMENT | |
| Title | Dissipation of chlorpyrifos in red loam soil and its effect on soil organisms |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc. | Vellayani |
| Name of publisher, distributor, etc. | Department of Soil Science and Agricultural Chemistry, College of Agriculture |
| Date of publication, distribution, etc. | 2005 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 71 |
| 502 ## - DISSERTATION NOTE | |
| Degree type | MSc |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | The persistence and degradation of chlorpyrifos, a contact insecticide, widely used for the control of soil inhabiting insects were studied in relation to the application of organic manure and lime and also its effect on soil organisms. The experiment was done in field plots at Instructional Farm, College of Agriculture, Vellayani. The insecticide (chlorpyrifos 20 % EC) was applied @ 3 ml l-1 in different treatments. Soil samples were drawn 0, 5, 10, 20, 40 and 60 days after application and after the crop harvest. The residues were estimated in a gas liquid chromatograph using ECD. The results showed that dissipation of chlorpyrifos followed a biphasic pattern with an initial phase of rapid dissipation followed by a phase of slow dissipation. Significant difference in dissipation was observed among different treatments. In the presence of lime chlorpyrifos was found to be highly unstable and dissipated easily by alkaline hydrolysis. Organic manure applied plots the persistence of chlorpyrifos was high due to the adsorption of insecticide in organic matter. The combined application of lime and organic manure cause significant difference in the degradation. The pattern of degradation of chlorpyrifos at lower depth of 15-30 cm soil were similar to surface layer except the initial survey of the insecticide at lower surface layer was less compared to upper layer (0-15 cm). Application of chlorpyrifos inhibited the population of bacteria and arthropods, irrespective of the treatment. The bacterial population showed a significant decrease upto 10 days of application of chlorpyrifos and the original count was regained in 75 days. The result also showed that chlorpyrifos application did not affect fungal population. Chlorpyrifos was found to be highly toxic to soil arthropods upto 10 days of application and were not regained till 75 days of application. There was a slight decrease in nodulation in cowpea as compared to control. No residue of chlorpyrifos was detected in the plant parts (pods and grain) from any of the treatment after harvest. Nutrient content on the soil showed an increase in the analytical values due to the treatment effects. |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Thomas George(Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://krishikosh.egranth.ac.in/handle/1/5810108319 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Theses |
| Withdrawn status | Lost status | Source of classification or shelving scheme | Damaged status | Not for loan | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2014-03-18 | 631.4 REK/DI | 172514 | 2014-03-18 | 2014-03-18 | Theses |